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

Lu, Yong, 1989 (author): Chalmers tekniska högskola,Chalmers University of Technology,Universität Stuttgart,University of Stuttgart

Fadavi Roudsari, Anita, 1978 (author): Chalmers tekniska högskola,Chalmers University of Technology

Delsing, Per, 1959 (author): Chalmers tekniska högskola,Chalmers University of Technology

(creator_code:org_t)

Related links:: https://research.cha... (primary) (free); show more...; https://research.cha...; https://doi.org/10.1...; show less...

Abstract Subject headings

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.

By the author/editor: He, X. L.; Lu, Yong, 1989; Bao, D. Q.; Xue, Hang; Jiang, W. B.; Wang, Z.; show more...; Fadavi Roudsari, ...; Delsing, Per, 19 ...; Tsai, J. S.; Lin, Z. R.; show less...

About the subject

NATURAL SCIENCES: NATURAL SCIENCES; and Physical Science ...; and Atom and Molecul ...

NATURAL SCIENCES: NATURAL SCIENCES; and Physical Science ...; and Other Physics To ...

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