Superconducting Cavity Qubit with Tens of Milliseconds Single-Photon Coherence Time

Ofir Milul; Barkay Guttel; Uri Goldblatt; Sergey Hazanov; Lalit M. Joshi; Daniel Chausovsky; Nitzan Kahn; Engin Çiftyürek; Fabien Lafont; Serge Rosenblum

doi:10.1103/PRXQuantum.4.030336

Superconducting Cavity Qubit with Tens of Milliseconds Single-Photon Coherence Time

Ofir Milul, Barkay Guttel, Uri Goldblatt, Sergey Hazanov, Lalit M. Joshi, Daniel Chausovsky, Nitzan Kahn, Engin Çiftyürek, Fabien Lafont, Serge Rosenblum

DOI 10.1103/PRXQuantum.4.030336 · PRX Quantum

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Abstract

Storing quantum information for an extended period of time is essential for running quantum algorithms with low errors. Currently, superconducting quantum memories have coherence times of a few milliseconds, and surpassing this performance has remained an outstanding challenge. In this work, we report a single-photon qubit encoded in a novel superconducting cavity with a coherence time of 34 ms, representing an order of magnitude improvement compared to previous demonstrations. We use this long-lived quantum memory to store a Schrödinger cat state with a record size of 1024 photons, indicating the cavity’s potential for bosonic quantum error correction.

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