Fast generation of Schrödinger cat states using a Kerr-tunable superconducting resonator

X. L. He, Yong Lu (), D. Q. Bao, Hang Xue, W. B. Jiang, Z. Wang, A. F. Roudsari, Per Delsing, J. S. Tsai and Z. R. Lin ()
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X. L. He: Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences
Yong Lu: University of Stuttgart
D. Q. Bao: Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences
Hang Xue: Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences
W. B. Jiang: Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences
Z. Wang: Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences
A. F. Roudsari: Chalmers University of Technology
Per Delsing: Chalmers University of Technology
J. S. Tsai: Tokyo University of Science
Z. R. Lin: Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences

Nature Communications, 2023, vol. 14, issue 1, 1-10

Abstract: Abstract Schrödinger cat states, quantum superpositions of macroscopically distinct classical states, are an important resource for quantum communication, quantum metrology and quantum computation. Especially, cat states in a phase space protected against phase-flip errors can be used as a logical qubit. However, cat states, normally generated in three-dimensional cavities and/or strong multi-photon drives, are facing the challenges of scalability and controllability. Here, we present a strategy to generate and preserve cat states in a coplanar superconducting circuit by the fast modulation of Kerr nonlinearity. At the Kerr-free work point, our cat states are passively preserved due to the vanishing Kerr effect. We are able to prepare a 2-component cat state in our chip-based device with a fidelity reaching 89.1% under a 96 ns gate time. Our scheme shows an excellent route to constructing a chip-based bosonic quantum processor.

Date: 2023
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DOI: 10.1038/s41467-023-42057-0

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