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Strengthening weak measurements of qubit out-of-time-order correlators

Dressel, Justin and González Alonso, José Raúl and Waegell, Mordecai and Yunger Halpern, Nicole (2018) Strengthening weak measurements of qubit out-of-time-order correlators. Physical Review A, 98 (1). Art. No. 012132. ISSN 2469-9926. http://resolver.caltech.edu/CaltechAUTHORS:20180725-074911293

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Abstract

For systems of controllable qubits, we provide a method for experimentally obtaining a useful class of multitime correlators using sequential generalized measurements of arbitrary strength. Specifically, if a correlator can be expressed as an average of nested (anti)commutators of operators that square to the identity, then that correlator can be determined exactly from the average of a measurement sequence. As a relevant example, we provide quantum circuits for measuring multiqubit out-of-time-order correlators using optimized control-Z or ZX-90 two-qubit gates common in superconducting transmon implementations.


Item Type:Article
Related URLs:
URLURL TypeDescription
https://doi.org/10.1103/PhysRevA.98.012132DOIArticle
https://arxiv.org/abs/1805.00667arXivDiscussion Paper
ORCID:
AuthorORCID
Yunger Halpern, Nicole0000-0001-8670-6212
Additional Information:© 2018 American Physical Society. Received 2 May 2018; published 25 July 2018. The authors are grateful for discussions with Brian Swingle and Felix Haehl. J.D. was partially supported by the Army Research Office Grant No. W911NF-15-1-0496. J.R.G.A. was supported by a fellowship from the Grand Challenges Initiative at Chapman University. M.W. was partially supported by the Fetzer-Franklin Fund of the John E. Fetzer Memorial Trust. N.Y.H. is grateful for funding from the Institute for Quantum Information and Matter, an NSF Physics Frontiers Center (NSF Grant No. PHY-1125565) with support of the Gordon and Betty Moore Foundation (Grant No. GBMF-2644), and for a Barbara Groce Graduate Fellowship.
Group:IQIM, Institute for Quantum Information and Matter
Funders:
Funding AgencyGrant Number
Army Research Office (ARO)W911NF-15-1-0496
Chapman UniversityUNSPECIFIED
John E. Fetzer Memorial TrustUNSPECIFIED
Institute for Quantum Information and Matter (IQIM)UNSPECIFIED
NSFPHY-1125565
Gordon and Betty Moore FoundationGBMF-2644
Barbara Groce Graduate Fellowship, CaltechUNSPECIFIED
Record Number:CaltechAUTHORS:20180725-074911293
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20180725-074911293
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:88226
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:25 Jul 2018 15:00
Last Modified:25 Jul 2018 15:00

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