Superconducting circuit protected by two-Cooper-pair tunneling

W. C. Smith; A. Kou; X. Xiao; U. Vool; M. H. Devoret

doi:10.1038/s41534-019-0231-2

Superconducting circuit protected by two-Cooper-pair tunneling

W. C. Smith, A. Kou, X. Xiao, U. Vool, M. H. Devoret

Research output: Contribution to journal › Article › peer-review

Abstract

We present a protected superconducting qubit based on an effective circuit element that only allows pairs of Cooper pairs to tunnel. These dynamics give rise to a nearly degenerate ground state manifold indexed by the parity of tunneled Cooper pairs. We show that, when the circuit element is shunted by a large capacitance, this manifold can be used as a logical qubit that we expect to be insensitive to multiple relaxation and dephasing mechanisms.

Original language	English (US)
Article number	8
Journal	npj Quantum Information
Volume	6
Issue number	1
DOIs	https://doi.org/10.1038/s41534-019-0231-2
State	Published - Jan 21 2020
Externally published	Yes

ASJC Scopus subject areas

Computer Science (miscellaneous)
Statistical and Nonlinear Physics
Computer Networks and Communications
Computational Theory and Mathematics

Online availability

10.1038/s41534-019-0231-2

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AU - Vool, U.

AU - Devoret, M. H.

N1 - Funding Information: We thank J. Cohen, S.M. Girvin, L.I. Glazman, M. Mirrahimi, R.J. Schoelkopf, K. Serniak, and S. Shankar for their insights. This work was supported by the Army Research Office Grant No. W911NF-14-1-0011 and W911NF-18-1-0212. W.C.S. was supported by DoDMURI award No. FP057123-C. Facilities use was supported by the Yale Institute of Nanoscience and Quantum Engineering under National Science Foundation Grant No. MRS1119826. Publisher Copyright: © 2020, The Author(s).

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Superconducting circuit protected by two-Cooper-pair tunneling

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