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. doi:10.1103/PhysRevA.98.012132. https://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.
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| 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: | Institute for Quantum Information and Matter | ||||||||||||||||
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| Issue or Number: | 1 | ||||||||||||||||
| DOI: | 10.1103/PhysRevA.98.012132 | ||||||||||||||||
| Record Number: | CaltechAUTHORS:20180725-074911293 | ||||||||||||||||
| Persistent URL: | https://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: | 16 Nov 2021 00:25 |
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