15th RQC Seminar
Dr. Dany Lachance-Quirion
ハイブリッド（Zoom ・ 理研 和光事業所 統合支援棟2階 大会議室）
Autonomous quantum error correction of Gottesman-Kitaev-Preskill states
Bosonic codes aim to take advantage of the large Hilbert space offered by harmonic oscillators to encode logical qubits within a single physical system, thus providing a possible route for hardware-efficient quantum computing. Most notably, Gottesman-Kitaev-Preskill (GKP) states are shown to be resilient to the main source of error in most bosonic systems, single photon loss. Initialization and quantum error correction of GKP states has been recently demonstrated in both superconducting circuits and trapped ions. Here we present experimental results on the stabilization of GKP states based on a recently proposed reservoir-engineering approach. Our approach uses a measurement-free reset of the ancilla qubit, making the quantum error correction protocol completely autonomous. The logical lifetime with quantum error correction is shown to be on par with the lifetime under free evolution, demonstrating autonomous quantum error correction close to the break-even threshold without any postselection.