
Résumé : Quantum error correction promises to make quantum computation scalable by encoding the logical information in a redundantly large amount of physical qubits. By using sufficiently many qubits, one can theoretically lower the probability of an error in a quantum computation to any desired number. Recently, there have been numerous demonstrations of quantum memory experiments, i.e., experiments where an encoded quantum state is preserved over time, on various physical platforms, with different encodings. Apart from being able to preserve a quantum state, a universal fault-tolerant quantum computer needs to be able to perform a universal set of operations. For superconducting qubits, which can’t be easily moved around in space and typically only have local connectivity, one of the viable solutions is lattice surgery. In this talk, I’ll discuss the basics of lattice surgery, with the example of our recent implementation of a lattice split operation with superconducting transmon qubits on a surface code lattice 1. 1 Ilya Besedin, Michael Kerschbaum, Jonathan Knoll et al. Realizing Lattice Surgery on Two Distance-Three Repetition Codes with Superconducting Qubits. arxiv: 2501.04612 (2025).
