Fast generation of Schrödinger cat states using a Kerr-tunable superconducting resonator
Journal article, 2023
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.
Author
X. L. He
Chinese Academy of Sciences
Yong Lu
Chalmers, Microtechnology and Nanoscience (MC2), Quantum Technology
University of Stuttgart
D. Q. Bao
Chinese Academy of Sciences
Hang Xue
Chinese Academy of Sciences
W. B. Jiang
Chinese Academy of Sciences
Z. Wang
Chinese Academy of Sciences
Anita Fadavi Roudsari
Chalmers, Microtechnology and Nanoscience (MC2), Quantum Technology
Per Delsing
Chalmers, Microtechnology and Nanoscience (MC2), Quantum Technology
J. S. Tsai
Tokyo University of Science
RIKEN
Z. R. Lin
Chinese Academy of Sciences
Nature Communications
2041-1723 (ISSN) 20411723 (eISSN)
Vol. 14 1 6358Quantum Sound: Generating and manipulating phonons at the quantum level
Swedish Research Council (VR) (2015-00152), 2016-01-01 -- 2025-12-31.
Subject Categories
Atom and Molecular Physics and Optics
Other Physics Topics
DOI
10.1038/s41467-023-42057-0
PubMed
37821443