Over recent years, transverse approaches appeared thanks to the new geometries made possible by the technology expertise of the team (1D confinement of photons and electrons in structures such as nanowires, but also by taking into account (and use as a resource) the local environment of phonons and charges.
These approaches, theoretically and experimentally, open a new chapter of quantum optics, not within reach of isolated atoms systems, namely the quantum optics in a solid environment.
Our research are oriented in 3 axes, based on :
These 3 ideas structure and cross fertilize the various subjects we are motivated to study :
Des physiciens ont réalisé un système hybride associant un fil vibrant et un atome artificiel formé par une boîte quantique semi-conductrice. Le couplage entre ces deux systèmes, reposant sur des effets de contrainte mécanique, est une première étape vers la possibilité de transférer les propriétés quantiques de l’atome artificiel vers l’oscillateur mécanique.
1-presentation The goals of this project are the fabrication and the characterisation of superconducting photons counters. These bolometric photo-detectors are made of an ultrathin ( 2- Operating principle These detectors are made of a superconducting strip of a few microns long, 250 nm wide... > suite
People : Experiment : Gilles Nogues, Jean-Philippe Poizat, Signe Seidelin, PhD Student : Inah Yeo ; Technical staff : Edouard Wagner Theory : Alexia Auffèves ; Post-doc : Stefano Portolan, PhD students, Igor Diniz, Daniel Valente. Principle We aim at realizing a CNOT gate between single... > suite
People : Optics : Kuntheak Kheng, Jean-Philippe Poizat ; PhD Student : Samir Bounouar Growth : Régis André, Edith Belley, Catherine Bougerol, Martien den Hertog, Serge Tatarenko ; Phd student : Miryam Elouneg-Jamroz Production - Single photon from single semiconducting quantum dots Quantum... > suite
People : Régis André, Jean-Michel Gérard, Kuntheak Kheng, Henri Mariette, Jean-Philippe Poizat, Robert Romestain Photon correlation experiments We report correlation and cross-correlation measurements of photons emitted under continuous wave excitation by a single II–VI quantum dot (QD) grown by... > suite
People : Alexia Auffèves, Jean-Philippe Poizat, Jean-Michel Gérard 1. Spontaneous emission of a quantum dot in a semi-conducting cavity Our aim is to study how the results of Cavity Quantum Electrodynamics (CQED) are modified when one replaces an isolated two-level atom by a solid-state atom... > suite
Exploring light-matter interaction at the single photon level is a quest of quantum optics, that has been successfully achieved so far with emitters in microwave or optical cavities. In such systems high atom-field couplings are obtained by trapping light in high quality factor resonators. Recently, alternative strategies have emerged, based on the broadband coupling of the emitter to a one-dimensional (1D) electromagnetic environment. These new devices invite to revisit important results of quantum optics, when the emitter interacts with propagating photons. We have studied the optical response of such one-dimensional atom when it is excited with a monochromatic classical pump. Going to the fully quantized picture, we have investigated the dynamics of an initially inverted atom in a waveguide in the presence of a single propagating photon. This works sheds new light on the physics of stimulated emission and opens the path to appealing applications for integrated quantum information and communication processing.
Individual modes for radiation and matter can be realized, on the one hand by confining photons in solid state resonant cavities and, on the other hand, by confining an electron and a hole in a semiconductor Quantum Dot (QD), so as to create an atom-like species called an exciton. When these... > suite
Excitons-polaritons are the elementary bosonic excitations of semiconductor microcavity in the so-called strong coupling regime. Owing to their bosonic and interacting nature, and in spite of their driven-dissipative nature, polaritons are found to exhibit superfluid behavior. As pointed out by Bogoliubov in his celebrated theory of superfluidity, the phenomena of superfluidity arises from a profound transformation of the nature of the excitations of the system, at the normal to superfluid transition. Using a non-linear optical spectroscopic technique, we observed directly this transformation, and reported for the first time an experimental measurement of the polariton superfluid linear dispersion, reminiscent of sound wave excitation (sometime referred to as zero sound), accompanied by a characteristic lower energy anomalous dispersion branch.
People : Régis André, Joël Bleuse, Le Si Dang, Bruno Daudin, Bruno Gayral, Jean-Michel Gérard, Kuntheak Kheng, Henri Mariette, Marlène Terrier Benoît Amstatt, Sebastien Founta, Laurent Maingault, Sebastien Moehl, Julien Renard, Fabian Rol, Franck Tinjod, Adrien Tribu Overview and results GaN... > suite
People : Robert Romestain†, Régis André, Le Si Dang Jacek Kasprzak, Maxime Richard Results : Why Microcavity Polaritons ? Bosons are integer spin particles, which can undergo BEC when their thermal de Broglie wavelength becomes comparable to their average separation. Then a... > suite