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Since January 2019, the Quantum Electronic Circuits Alps team gathers researchers from the Quantum Coherence (CQ) and the NanoSpin teams. This merger is part of an ambitious effort to build a joint research group together with teams from CEA-IRIG and CEA-LETI in order to face the challenge of the rapidly developing field of Quantum Technologies. The joint research team focuses its research on experimental studies to reveal quantum effects in original and novel quantum nano-electronics devices.
The team members share common research interests and develop original experimental techniques for electronic transport measurements and microwave techniques to observe and control new quantum effects in various different materials. The team’s specificity lies within the quantum nano-electronic circuit itself that defines the novel physics, the material used to build it and the measurement technology. To have access to quantum coherence effects in electronic systems and to their coherent manipulation, very stringent experimental conditions are required such as very low temperature, very low noise and weak measurement signals, microwave techniques as well as high quality nano-fabricated samples.
Original results from the team were obtained also thanks to a continuous effort to develop novel technology (Josephson-junction arrays, scanning probe experiments…) and novel high-quality nanostructures (topological insulators, epitaxially grown superconductors…). During the last 5 years, the team has been strongly involved in building novel experimental set-ups to control multi-qubit systems, to develop quantum-limited amplifiers, to develop opto-electronic techniques compatible with cryogenic environment and to develop cryogenic refrigerators. The team has significantly increased the number of its experimental sites. This was made possible thanks to a strong support of the NEEL technological groups, to grants through funded projects and also to the dynamism and commitment of permanent as well as non permanent researchers.
The QuantECA team focuses its research on experimental studies to reveal quantum effects in original and novel quantum nano-electronics devices. Its research activities can be decomposed into the following main topics:
Olivier Buisson, Wiebke Hasch-Guichard, Cécile Naud and Nicolas Roch
Karthik Bharadwaj, Thibault Charpentier, Jovian Delaforce, Martina Esposito, Dorian Fraudet, Sébastien Leger, Vladimir Milchakov, Luca Planat, Kazi Rafsanjani, Arpit Ranadive
During the last decade, it has been demonstrated that superconducting circuits including Josephson junctions behave as quantum bits and are very well suited to realize advanced quantum mechanical experiments. These circuits appear as artificial atoms whose properties are defined by their electronic characteristics (capacitance, inductance and tunnel barrier).
Moreover, given their mesoscopic size, these quantum bits couple very strongly to electromagnetic radiation in the microwave range. Thus, it is now possible to perform quantum optics experiments using microwave photons and to unravel light-matter interactions using circuits.
In our group, we design and build novel superconducting quantum circuits. One aim is to develop the next generation superconducting qubits (with longer coherence time and/or higher read-out fidelity). We are also interested in using these circuits to explore phenomena that challenge the current understanding of quantum mechanics (e.g. quantum phase slips, quantum phase transition or quantum criticality). Finally we investigate the quantum limits of amplification and microwave detection using such superconducting quantum circuits (with a wealth of application in quantum sensing). These advanced experiments rely on nanofabrication, microwave measurement, very low noise electronics and very low temperature techniques. We benefit from the strong support of the technical groups in Néel Institute and from various national and international collaborations.
We are studying non-demolition quantum measurements in a quantum system consisting of a superconducting quantum bit (a “qubit”) coupled to a radiative microwave field which carries the information to a classical detector. In an original experiment, we have developed a new coupling between the qubit and the microwave radiation field, called “cross-Kerr”. The qubit itself is realized by an aluminum superconducting circuit containing two Josephson tunnel junctions of submicron size. Electron-beam lithography was used to create a resin mask employed for defining the microwave circuit during thin-film evaporation of the aluminum. The superconducting properties of the circuit are essential for obtaining a non-dissipative microwave oscillator with quality factor as large as 105. In order that thermally-induced quantum fluctuations do not mix the two quantum states, the experiments must be performed at kBT ≪ ℏωqb. The oscillator is held at the very low temperature of 30 mK in a home-made dilution cryostat.
Collaborations: Tomás Ramos and Juan-José García-Ripoll, Quantum Information and Foundations Group, IFF-CSIC, Madrid, Spain.
Publications:
A V-shape superconducting artificial atom based on two inductively coupled transmons, É. Dumur, B. Küng, A. K. Feofanov, T. Weissl, N. Roch, C. Naud, W. Guichard, O. Buisson, arXiv:1501.04892, Phys. Rev. B 92, 020515(R) (2015).
Fast high fidelity quantum non-demolition qubit readout via a non-perturbative cross-Kerr coupling, R. Dassonneville, T. Ramos, V. Milchakov, L. Planat, E. Dumur, F. Foroughi, J. Puertas,S. Leger, K. Bharadwaj, J. Delaforce, C. Naud, W. Hasch-Guichard, J. J. Garcıa-Ripoll, N. Roch, and O. Buisson, Phys. Rev. X 10, 011045 (2020).
Fundings: ANR REQUIEM
We have developed several circuits of the Fluxonium qubit. We are analysing the different loss mechanism in this superconducting qubit depending whether it is measured in a 3D or 2D configuration.
Collaborations:
Gianluca Rastelli, University of Konstanz, Germany
Ioan Pop, Karlsruhe Institute of Technology, Germany
Funding: ERC FreqJoc, COFUND Greque
By making arrays of Josephson junction, we can obtain a new type of metamaterials: high impedance and tunable transmission lines. We are studying the dynamics of these chains of Josephson junctions. Plasma modes propagating along the chains have been experimentally and theoretically analyzed as well as their Kerr nonlinearities. In particular we have studied the dispersion and non-linear self- and cross-Kerr frequency shifts of plasma modes in a one-dimensional Josephson junction chain containing 500 SQUIDs in the regime of weak nonlinearity. In the strong quantum fluctuation regime, we studied the effect of the quantum phase slips.
Publications:
Kerr coefficients of plasma resonances in Josephson junction chains, Thomas Weißl, Bruno Küng, Étienne Dumur, Alexey K. Feofanov, Iulian Matei, Cécile Naud, Olivier Buisson, Frank W. J. Hekking, Wiebke Guichard, Phys. Rev. B 92, 104508, (2015).
Kerr nonlinearity in a superconducting Josephson metamaterial. Yu. Krupko, V. D. Nguyen, T. Weissl, E. Dumur, J. Puertas, R. Dassonneville, C. Naud, F. W. J. Hekking, D. Basko, O. Buisson, N. Roch, W. Guichard, Phys. Rev. B 98, 094516 (2018) (2018).
Fundings: ERC FrequJoc
The use of superconducting circuits as building blocks for studying light matter interactions at the fundamental level was introduced more than a decade ago and is named Circuit Quantum ElectroDynamics (circuitQED). With this project we are pushing these ideas to the next level and building circuits to explore many-body quantum optics.
To reach this novel physics, we have developed a unique quantum platform based on superconducting qubits coupled to plasma modes propagating inside an extended Josephson junctions chain. By tailoring the properties of this metamaterial (more specifically its characteristic impedance), we can enhance the qubit-plasma modes coupling up to the ultra-strong coupling regime.
Publications:
Observation of quantum many-body effects due to zero point fluctuations in superconducting circuits, S. Leger, J. Puertas Martínez, K. Bharadwaj, R. Dassonneville, J. Delaforce, F. Foroughi, V. Milchakov, L. Planat, O. Buisson, C. Naud, W. Hasch-Guichard, S. Florens, I. Snyman, and N. Roch, Nature Communications 10, 5259 (2019), Arxiv | Nat. Commun.
A tunable Josephson platform to explore many-body quantum optics in circuit-QED, J. Puertas Martinez, S. Leger, N. Gheereart, R. Dassonneville, L. Planat, F. Foroughi, Y. Krupko, O. Buisson, C. Naud, W. Guichard, S. Florens, I. Snyman, N. Roch, npj Quantum Information 5, 19 (2019), Arxiv | npj Quantum Information
Particle production in a waveguide ultra-strongly coupled to a qubit, N. Gheeraert, X. H. H. Zhang, S. Bera, N. Roch, H. U. Baranger and S. Florens, Physical Review A 98, 43816 (2018), Arxiv | Phys. Rev. A
Fundings: ANR CLOUD, LANEF, ANR BOCA, QuantERA SiUCs
Measuring these microwave photons with very high quantum efficiency remains a tremendous challenge, since the energy conveyed by one single microwave photon is hundreds thousand times smaller than the one of usual optical photons. Yet signals at the single-photon level can be measured using Josephson parametric amplifiers.
In our team we are now using superconducting metamaterials (see figure) to engineer the next generation of parametric amplifiers. These new devices allow us to explore the quantum limits of amplification as well as to perform quantum optics experiments.
Publications:
A photonic crystal Josephson traveling wave parametric amplifier, L. Planat, A. Ranadive, R. Dassonneville, J. Puertas Martínez, S. Leger, C. Naud, O. Buisson, W. Hasch-Guichard, D. M. Basko, and N. Roch, Physical Review X 10, 021021 (2020) Arxiv | Phys. Rev. X. See also Physics Synopis: A Simple Solution for Microwave Amplification and CNRS la lettre innovation: Un amplificateur quantique pour la lecture des bits quantiques.
Non-degenerate parametric amplifiers based on dispersion engineered Josephson junction arrays, P. Winkel, I. Takmakov, D. Rieger, L. Planat, W. Hasch-Guichard, L. Grünhaupt, N. Maleeva, F. Foroughi, F. Henriques, K. Borisov, J. Ferrero, A. V. Ustinov, W. Wernsdorfer, N. Roch, and I. M. Pop, Physical Review Applied 13, 024015 (2020), Arxiv | Phys. Rev. Applied
Fabrication and characterization of aluminum SQUID transmission lines, L. Planat, E. Al-Tavil, J. Puertas Martínez, R. Dassonneville, F. Foroughi, S. Leger, K. Bharadwaj, J. Delaforce, V. Milchakov, C. Naud, O. Buisson, W. Hasch-Guichard, and N. Roch, Physical Review Applied 12, 064017 (2019), Arxiv | Phys. Rev. Applied
Understanding the saturation power of Josephson Parametric Amplifiers made from SQUIDs arrays, L. Planat, R. Dassonneville, J. Puertas Martínez, F. Foroughi, O. Buisson, W. Hasch-Guichard, C. Naud, R. Vijay, K. Murch, and N. Roch, Physical Review Applied 11, 034014 (2019), Arxiv | Phys. Rev. Applied
Fundings: ANR CLOUD, LANEF, ANR BOCA, QuantERA SiUCs
Hybrid superconducting-semiconducting systems are promising candidates for nano-electronic quantum devices including qubits and quantum circuits. In collaboration with the Institute of Solid-State Electronics at TU Wien, Vienna, Austria and IRIG/LEMMA in CEA Grenoble, we have fabricated and characterised hybrid nanowire aluminium/germanium/aluminium heterostructures. A novel annealing technique allows to reach atomically precise interfaces. Measuring at low temperature, we have demonstrated the exceptional electrical transport characteristics of these high-quality nanowires heterostructures. By tuning with a single gate, we observe from single hole quantum dot to Josephson effect regimes.
Having overcome the limitations of interface defects, the presented results establish Ge quantum dots in an hybrid superconductor-semiconductor Al-Ge-Al nanowire heterostructures as potentially interesting platform for the study of Majorana zero modes and key components of quantum computing such as gatemons qubits or gate tunable SQUIDS.
Collaborations: Alois Lugstein and Masiar Sistani, Institute of Solid-State Electronics at TU Wien, Vienna, Austria
Publications:
Highly transparent contacts to the 1D hole gas in ultra-scaled Ge/Si core/shell nanowires, M. Sistani, J. Delaforce, R. Kramer, N. Roch, M.A. Luong, M.I. den Hertog, E. Robin, J. Smoliner, J. Yao, C.M. Lieber, C. Naud, A. Lugstein, O. Buisson, ACS Nano 13, 12, 14145-14151 (2019).
Coulomb blockade in monolithic and monocrystalline Al-Ge-Al nanowire heterostructrures” by M. Sistani, J. Delaforce, K. Bharadwaj, M. Luong, J. Nacenta, N Roch, M. den Hertog, R. Kramer, O. Buisson, A. Lugstein and C. Naud, , Appl. Phys. Lett. 116, 013105 (2020).
Fundings: ANR QPSNanowires, COFUND Greque
Jeremie Viennot, Nicolas Roch, Franck Balestro
The motion and the vibration of objects are phenomena we experience every day. But how does this translate at the quantum scale, when motion is governed by quantum mechanics? For a few years, this question can be investigated experimentally, with nano- and micro-objects being prepared in quantum states of motion. Acoustic/mechanical systems also have great potential for applications in quantum engineering science (better isolation between individual systems, small footprint) and they interact with various systems, from spins to microwave and optical photons. In our group we build and measure devices to study both these fundamental and applied aspects experimentally.
Controlling solid-state phonons at the quantum scale is opening up exciting new experimental avenues. These experiments go from the fundamental investigation of coherent spin-phonon interactions in the quantum regime, to the engineering of quantum acoustic devices to interface 2D materials or spin qubits. We develop this type of experiments, using piezoelectric materials to couple directly to superconducting microwave circuits. These superconducting circuits then provide access to a powerful quantum toolbox for the control of acoustic phonons. These experiments happen on chips fabricated in-house, measured at very low temperature (few mK) and microwave frequency (few GHz).
The spin-phonon experiments, which focus on molecular magnet spins because of their naturally large coupling to phonons, are done in collaboration with W. Wernsdorfer (KIT, Germany).
Funding: ANR Q-MagMech
Superconducting qubits are one of the leading platform in experimental quantum information science. One roadblock to scale up these devices, which operate at microwave frequencies, is the lack of a coherent quantum channel to transport quantum information over long distances. At optical frequencies, such a channel is naturally available but optical light is not compatible with superconducting qubits. However, nano- and micro-mechanical oscillators can couple coherently both to microwave and optical photons. We develop such nanomechanical devices, with the aim to enable reversible and coherent transduction between microwave and optical photons.
This project is in collaboration with Julien Renard (Néel), Sebastien Hentz and Guillaume Jourdan (CEA Leti).
Funding: Carnot project
An electronic spin in silicon 28 exhibits outstanding coherence properties and large-scale prospects for integration. Its main assets for scalability are immediate compatibility with CMOS technologies on one hand and effective sizes of spin qubits with all their quantum functionalities below the μm on the other hand.. Our objective is to explore the possibilities of scaling up and designing circuits with a large number of qubits made with CMOS technology. In the long term, we want to implement spin-based quantum digital computation in silicon and demonstrate quantum supremacy over classical computing for certain types of problems.
Key experiments have shown that the spin lifetime and coherence time can be adapted by appropriate molecular engineering indicating potentiality for quantum technologies. Moreover, molecular magnets provide access to state of-the-art qudits. These multi-level devices can be used to emulate processes involved in quantum spin manipulation. The use of qudits could also simplify the required circuits to fabricate the quantum computer itself. However, the future of molecular magnets for quantum information processing may be conditioned by our ability to propose scalable architectures and to speed-up our readout technique. The readout of nuclear spin states needs to be speed-up.. To achieve this acceleration of the readout cycle, different detection schemes are proposed. To this end, electron spin resonance technique and coupling to superconducting resonator are investigated.
Key experiments have shown that the spin lifetime and coherence time can be adapted by appropriate molecular engineering indicating potentiality for quantum technologies. Moreover, molecular magnets provide access to state of-the-art qudits. These multi-level devices can be used to emulate processes involved in quantum spin manipulation. The use of qudits could also simplify the required circuits to fabricate the quantum computer itself. However, the future of molecular magnets for quantum information processing may be conditioned by our ability to propose scalable architectures and to speed-up our readout technique. The readout of nuclear spin states needs to be speed-up.. To achieve this acceleration of the readout cycle, different detection schemes are proposed. To this end, electron spin resonance technique and coupling to superconducting resonator are investigated.
An electronic spin in silicon 28 exhibits outstanding coherence properties and large-scale prospects for integration. . Its main assets for scalability are immediate compatibility with CMOS technologies on one hand and effective sizes of spin qubits with all their quantum functionalities below the μm on the other hand.. Our objective is to explore the possibilities of scaling up and designing circuits with a large number of qubits made with CMOS technology. In the long term, we want to implement spin-based quantum digital computation in silicon and demonstrate quantum supremacy over classical computing for certain types of problems.
Coherent manipulation of single electrons in solid-state devices is attractive for quantum information purposes because they have a high potential for scalability. Depending on the system used, the charge or the spin may code binary qubit information. A particular appealing idea is to use a single flying electron itself as the conveyor of quantum information. Such electronic flying qubits allow performing quantum operations on qubits while they are being coherently transferred.
Information processing typically takes place in the nodes of the quantum network on locally controlled qubits, but quantum networking would require flying qubits to exchange information from one location to another. It is therefore of prime interest to develop ways of transferring information from one node to the other. The availability of flying qubits would enable the possibility to develop new non-local architectures for quantum computing with possibly cheaper hardware overhead than e.g. surface codes. The aim of our research is to establish a unique innovative platform for creating, manipulating and detecting single-electron wave packets in semiconductor quantum circuits and exploit them for quantum technologies.
This will include the development of (i) a picosecond on-demand coherent single-electron source and (ii) single-shot detection of propagating SEWP at the discrete charge level. With these technological breakthroughs we will be able to address (iii) quantum interferometry at the single-charge level. We will demonstrate the elementary building blocks that will be used for implementing a flying quantum bit. This will be combined with (iv) the development of a new software for predictive simulation and optimization of ultrafast quantum devices in collaboration with CEA Grenoble.
Further reading:
C. Bäuerle, D. C Glattli, T. Meunier, F. Portier, P. Roche, P. Roulleau, S. Takada, X. Waintal, Coherent control of single electrons : a review of current progress, Rep. Prog. Phys. 81 056503 (2018)
C. Bäuerle, T. Meunier and C. J. B. Ford, in Surface acoustic wave roadmap, Topical Review, J. Phys. D : Appl. Phys. 52 353001 (2019)
Collaboration and networking:
nanoelectronics group, Saclay (C. Glattli & P. Roulleau)
theory group, CEA Grenoble (X. Waintal & C. Groth)
Quantum Metrology Laboratory, AIST, Tsukuba, Japan (S. Takada & N. Kaneko)
RIKEN, Japan (M. Yamamoto)
Ruhr-Universität Bochum, Germany (A.D. Wieck)
Funding: ANR, H2020-FET-OPEN
a) Test sample with Al electrostatic gates b) Scanning single electron transistor image of the test sample.
A number of phenomena in condensed matter physics lead to an inhomogeneous distribution of a physical quantity. For example, the flux distribution in superconductors or the electron density of states of a semiconductor. A direct visualisation of these inhomogeneous states is often the only way to reveal their existence. In a bulk measurement without spatial resolution these effects may stay hidden. Scanning probe microscopy allows the visualization of a physical quantity by scanning the surface of interest with a very small detector or probe. The images represent high resolution maps of the specific property probed by the detector. Today these techniques are a key tool in nanoscience and nanotechnology.
In this project, we use a scanning single electron transistor microscope at low temperatures (< 300 mK) and high magnetic fields (0–18 T). This microscope has been recently developed at Néel Institute and is now fully operational. The probe, a single electron transistor, allows very sensitive electric charge detection at the nanoscale. With such a scanning probe microscope most of the two-dimensional electron systems can be studied. Some prominent systems are edge channels in the quantum Hall regime, surface states of three dimensional topological insulators or inhomogeneous electronic states close to a metal-insulator phase transition.
Transport measurements can be done simultaneously in situ which allows a careful characterisation of the sample close to a phase transition. A direct visualisation of these states are key to the fundamental understanding of these phenomena.
In PTA and Nanofab clean rooms, both at Grenoble, we have access to state of the art clean-room facilities:
Our group is specialized in transport measurement at very low temperatures. This requires skills in cryogenics and specific wiring. Here are some examples of dilution fridges :
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Dilution fridge called “SIONLUDI” This is an inverted fridge with large space for RF electronics and a base temperature close to 20 mK (cooling power: 250 µW). It is wired with 8 RF coax lines, 16 thermocoax wires and 27 manganine wires filtered with ECOSORB. It is equipped with a small, fast magnet that can generate a magnetic field up to 1 T. |
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Dilution fridge called “WODAN” This is a wet dilution fridge with large space for RF electronics and a base temperature close to 20 mK (cooling power: 1 mW). It is wired with 8 RF coax lines and 27 thermocoax wires. It is equipped with a two axis magnet 6 T/3 T |
In collaboration with the “pôle electronique” of the Néel Institute, we are developing low noise electronics (such as current amplifiers, low noise and highly stable DACs, voltage amplifiers) but also RF electronics (such as RF amplifiers, RF-DACs).
Position type: Stages Master-2 & Thèse
Contact: Quentin Ficheux -
Superconducting quantum circuits have emerged as one of leading platforms to build a quantum computer. While most efforts of the community focus on creating larger scale devices, the performances of each individual quantum bits remains a major limitation to achieve practical applications.
Position type: CDD
Contact: Nicolas Roch -
Your will be in charge of the experimental demonstration of a new generation of high impedance superconducting qubits focusing on designs intrinsically robust to noise.
This includes but is not limited to:
– Geometries combining several fluxonium qubits to gain collective protection.
– Multimode high impedance qubits hosting highly delocalized states with disjoint wavefunctions.
– High impedance qubits where protected states are dynamically generated using periodic drives.
You will be working in collaboration with the consortium of RobustSuperQ. You will benefit from a state–of–the–art clean room and a dedicated dilution refrigerator. Substantial funding will be made available to carry out the project, including the hiring of students and postdocs.
Please send your application to nicolas.roch@neel.cnrs.fr
Required documents: CV, recommendation contact, research statement (1 page)
Position type: Stages Licence & Master-1
Contact: BAUERLE Christopher - 04 7 6 88 78 43
The aim of the proposed M1 internship is to participate in the development of an original flying qubit architecture using ultra-short single-electron charge pulses. Such a flying electron qubit can be realized through an electronic Mach-Zehnder interferometer (see description).
Position type: Stages Master-2 & Thèse
Contact: Nicolas Roch - 0456387177
One of the present leading technologies for the realization of a universal quantum computer is based on superconducting quantum circuits. It exploits superconducting circuits based on Josephson junctions, which are characterized by quantized energy levels and for this reason can be adopted as quantum bits (qubits), the basic units of quantum information.
Position type: Stages Licence & Master-1
Contact: Naud Cecile - 0456387176
Our research aims at exploring promising superconductor/semiconductor hybrid devices based on ultra-scaled Al/Ge heterostructures. Inside the consortium, we will develop novel quantum devices and their integration in functional quantum circuits to study gatemon superconducting qubit, Andreev qubits, multiterminal junctions. We will measure their electronic transport properties in a homemade
He3 cryostat which allows to measure down to 350 mK and their qubit properties in the
microwave domain in a dilution fridge.
Position type: Stages Master-2 & Thèse
Contact: Naud Cécile - 0456387176 | Buisson Olivier -
The internship and the PhD is motivated by our recent investigations of the ultra-scaled hybrid superconducting/semiconducting aluminum/germanium (Al/Ge) devices. By tuning a gate voltage, they reveal a very rich quantum electronic physics ranging from single charge quantum dot, Coulomb diamonds to proximitized superconductivity. These properties were achieved thanks to the unique monolithic monocrystalline Al/Ge/Al nanowire heterostructure with remarkable atomically sharp interfaces between Al and Ge. These promising devices open the way towards quantum technologies in particular superconducting gatemon qubit or the study of Majorana fermions.
Position type: Stages Master-2 & Thèse
Contact: Bauerle Christopher - 04 76 88 78 43 | Waintal Xavier - + 33 4 38.78.03.27 | -
The aim of the proposed M2 internship is to obtain a better understanding of ongoing flying qubit experiments in electronic Mach-Zehnder interferometers using numerical simulations. Realistic simulations of the device will be performed with the Kwant and Nextnano softwares. In addition, new experiments using ultrashort single-electron wave packets show an increased visibility of quantum oscillations. A route to understand these new findings is to use time-dependent simulations using the Tkwant code.
Position type: Stages Master-2 & Thèse
Contact: Bauerle Christopher - 04 76 88 78 43 | ROUX Jean-François - (33)(0)4 79 75 87 55 | -
The aim of the proposed M2 internship is to participate in the design, the fabrication and the test of an original optoelectronic component dedicated to the excitation of flying qubit using ultra-short single-electron charge pulses. The work will be done in close collaboration in between Institut Néel (fabrication of the device, time resolved quantum experiment) and IMEP-LAHC (design and test of the THz photodetector).
Position type: Stages Master-2 & Thèse
Contact: Bauerle Christopher - 0476887843
The aim of the proposed M2 internship is to participate in the development of an original flying qubit architecture using ultra-short single-electron charge pulses. Such an electron flying qubit can be realized through an electronic Mach-Zehnder interferometer. Based on our recent experiments with such an electron flying qubit, we aim at coupling two electron flying qubits to realise quantum entanglement of two injected electron wave packets through Coulomb interaction (C) (see pdf).
Position type: Stages Master-2 & Thèse
Contact: Bauerle Christopher - 0476887843 | -
The aim of the proposed M2 internship is to participate in an ongoing research project to realize flying qubit architectures by propelling single electrons with sound. The fact that electrons transported by sound waves travel 5 orders of magnitude slower than the speed of light allows to implement real-time manipulation of the quantum state of the electrons “in-flight”. The student will participate in an ongoing experiment on two-electron collision (see Fig in attached file) and will realize quantum transport simulations with the actual quantum device structure.
Position type: CDD
Contact: Meunier Tristan - +33 4 56387088
The chair of excellence is valid for 5 years max. The goal of the project is to explore the potential of electron displacement one step further and push it towards incorporation in spin-based quantum computing processors. The candidate will benefit from the know-how and the infrastructure (Cryogeny and electronics) present at Institut Néel in the Quanteca group. The candidate will have the opportunity to build his/her own team. Funding includes salaries for candidate, additional salaries for the team and equipment.
Position type: Stages Master-2 & Thèse
Contact: Matthieu DARTIAILH - | Tristan MEUNIER -
The aim of this project is to develop both characterization and automatic tuning procedures for arrays of quantum dots.
The Neel team has extensive knowledge of GaAs devices that are highly tunable and an ongoing collaboration with CEA-LETI to access Si devices fabricated in their industrial foundry. The project will likely focus on GaAs samples which are more mature when it comes to larger arrays and bi-dimensional structures. However, the device characterization part will be shared with the CEA-LETI team which performs wafer scale characterization using a cryogenic probe station.
As the project moves forward, some procedures may be embedded in custom electronics developed at the Néel institute in collaboration with the electronic department.
Position type: Stages Master-2 & Thèse
Contact: CARDOSO-PAZ Bruna - 0615317474 | MEUNIER Tristan -
As part of the Quantum Silicon Grenoble project, teams at Néel Institute, CEA-LETI and CEA-IRIG aim at building a quantum accelerator with silicon spin quantum bits (qubits). Compatible with large-scale production, existing integration processes on Si are a real advantage for the scalability of these qubits. However, the reproducibility of charge and spin characteristics of these devices are yet to be explored and improved. This requires extensive/statistical electrical characterization and continuous feedback to process integration team.
Position type: CDD
Missions : L’ingénieur d’études (H/F) apporte une aide au pilotage, à la gestion, au suivi et à la coordination administrative et financière de plusieurs projets européens et contrats nationaux.
Il/Elle est rattaché hiérarchiquement au responsable d’un groupe de recherche de l’institut Néel
Il/Elle est l’interface entre le responsable, les différents services ou pôles du laboratoire, les financeurs et les fournisseurs.
Postulez sur le portail emploi : ici
Position type: Post-doc
Contact: Buisson Olivier - 04 56 38 71 77
Our superconducting qubit group in Neel Institute in Grenoble is seeking for a postdoctoral candidate to work on high fidelity quantum measurements and development of a superconducting multi-qubit platform.
During the last decade, it has been demonstrated that superconducting Josephson quantum circuits constitute ideal blocks to realize quantum mechanical experiments and to build promising quantum bits for quantum information processing. However, in this field, measurement of qubit suffers from intrinsic drawbacks and are still far from optimal performance. Recently, in our group, we demonstrated an original high-fidelity quantum measurement which overcomes the usual limitations.
Position type: Post-doc
Contact: Meunier Tristan - 0456387088
The scaling of quantum nanoprocessors requires the development of integrated electronics as close as possible of the quantum chips. In this context, electron spin qubits in semiconductors have been identified as a promising platform due to both its long coherence time and the possibility to leverage the well-established fabrication of microelectronic foundries for Si based quantum devices. Their direct compatibility with CMOS electronics enables potentially to co-integrate in a compact manner quantum devices and control electronics. This is the purpose of the proposed workplan to investigate such interface between control and quantum systems. It will be important for the integration of larger and larger quantum systems but also for extracting statistical information on the qubit properties.
Position type: Post-doc
Contact: Tristan Meunier -
The scaling of quantum nanoprocessors requires the development of integrated electronics as close as possible of the quantum chips. In this context, electron spin qubits in semiconductors have been identified as a promising platform due to both its long coherence time and the possibility to leverage the well–established fabrication of microelectronic foundries for Si based quantum devices. Their direct compatibility with CMOS electronics enables potentially to co–integrate in a compact manner quantum devices and control electronics.
Position type: Stages Master-2 & Thèse
Contact: Buisson Olivier - 04 56 38 71 77
You will carry out quantum experiments at very low temperature on superconducting qubits to study fundamental properties such as open quantum system dynamics, quantum trajectories and quantum non-demolition measurements. You will also participate to the development and improvment of a novel superconducting four qubits plateform.
Person in charge: Franck BALESTRO
Permanents
Students & Post-docs & CDD
Christopher BAUERLE
Personnel Chercheur - CNRS
Christopher.Bauerle@neel.cnrs.fr
Phone: 04 76 88 78 43
Office: M-113
Matias URDAMPILLETA
Personnel Chercheur - CNRS
matias.urdampilleta@neel.cnrs.fr
Phone: 04 76 88 79 34
Office: M-107
Bruna CARDOSO-PAZ
Personnel Chercheur - CNRS
bruna.cardoso-paz@neel.cnrs.fr
Phone: 04 76 88 79 47
Office: M-104
Referent: Tristan MEUNIER
Emmanuel CHANRION
Personnel Chercheur - CNRS
emmanuel.chanrion@neel.cnrs.fr
Phone: 04 56 38 70 25
Office: M-111
Referent: Tristan MEUNIER
Thibault CHARPENTIER
Personnel Chercheur - CNRS
thibault.charpentier@neel.cnrs.fr
Phone: 04 76 88 70 61
Office: D-318
Referent: Nicolas ROCH
Matthieu DARTIAILH
Personnel Chercheur - CNRS
matthieu.dartiailh@neel.cnrs.fr
Phone: 04 76 88 79 52
Office: V-104
Referent: Tristan MEUNIER
Giselle ELBAZ
Personnel Chercheur - CNRS
Office: D-318
Referent: Franck BALESTRO
Dorian FRAUDET
Personnel Chercheur - CNRS
Office: D-313
Referent: Nicolas ROCH
Clément GEFFROY
Personnel Chercheur - CNRS
Phone: 04 56 38 70 25
Office: M-111
Referent: Christopher BAUERLE
Mathieu KALBFEIS-DIT-DARNAS
Personnel Chercheur - CNRS
mathieu.kalbfeis-dit-darnas@neel.cnrs.fr
Referent: Tristan MEUNIER
Gwenael LE-GAL
Personnel Chercheur - CNRS
Office: C1-208
Referent: Nicolas ROCH
David NIEGEMANN
Personnel Chercheur - UGA
Phone: 04 76 88 79 47
Office: M-104
Referent: Matias URDAMPILLETA
Mohamed Seddik OUACEL
Personnel Chercheur - CNRS
mohamed-seddik.ouacel@neel.cnrs.fr
Office: M-105
Referent: Christopher BAUERLE
Jun-Liang WANG
Personnel Chercheur - CNRS
Phone: 04 56 38 70 25
Office: M-111
Referent: Christopher BAUERLE
Pierre-André MORTEMOUSQUE
Personnel Chercheur - CEA
pierre-andre.mortemousque@neel.cnrs.fr
Referent: Tristan MEUNIER
Wolfgang WERNSDORFER
Personnel Chercheur - Institut de Physique du KIT
Wolfgang.Wernsdorfer@neel.cnrs.fr
Phone: 04 76 88 79 09
Office: D-113
Referent: Franck BALESTRO
