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

Year: 2023
Type: article
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.
DOI: 10.1038/s41467-023-42057-0
Authors: X. L. He, Yong Lu, D. Q. Bao, Hang Xue, W. B. Jiang, Z. Wang, A. F. Roudsari, Per Delsing, J. S. Tsai, Z. R. Lin
Institutions: Chinese Academy of Sciences, Shanghai Institute of Microsystem and Information Technology, University of Chinese Academy of Sciences, University of Stuttgart, Chalmers University of Technology, Tokyo University of Science, RIKEN, RIKEN Center for Quantum Computing
Language: English
Open Access status: gold
Estimated APC paid: $6,290
Funders: National Natural Science Foundation of China, Chinese Academy of Sciences, Government of Guangdong Province, Knut och Alice Wallenbergs Stiftelse, Vetenskapsrådet, Wallenberg Center for Quantum Technology, Chalmers University of Technology
OpenAlex ID: W4387532142
FWCI: 5.077
Cites: 51
Cited by: 54
Related to: 10