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*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

30 Citations (Scopus)
45 Downloads (Pure)

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.

Original languageEnglish
Article number030336
Number of pages16
JournalPRX Quantum
Volume4
Issue number3
DOIs
Publication statusPublished - Jul 2023

Funding

Funding Information: We thank Benny Pasmantirer, Michael Rappaport, Haim Sade, and Zeng Hui for their contributions in designing the experimental system. The cavity was manufactured by RI Research Instruments GmbH under the supervision of Peter vom Stein. We acknowledge input from David Schuster and Andrew Oriani on cavity-etching methods, and comments on the paper from Philippe Campagne-Ibarcq, Alec Eickbusch, and Shay Hacohen-Gourgy. We acknowledge financial support from the Israel Science Foundation ISF Quantum Science and Technologies 963/19 and the European Research Council Starting Investigator Grant Q-CIRC 134847. S.R. is the incumbent of the Rabbi Dr Roger Herst Career Development Chair.

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • General Computer Science
  • Mathematical Physics
  • General Physics and Astronomy
  • Applied Mathematics
  • Electrical and Electronic Engineering

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