Strengthening Weak Measurements of Qubit Out-of-Time-Order Correlators

Authors

Justin Dressel, Chapman UniversityFollow
José Raúl González Alonso, Chapman University
Mordecai Waegell, Chapman University
Nicole Yunger Halpern, California Institute of Technology

Document Type

Article

Publication Date

7-25-2018

Abstract

For systems of controllable qubits,we provide amethod 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.

Comments

This article was originally published in Physical Review A, volume 98, in 2018. DOI:10.1103/PhysRevA.98.012132

Recommended Citation

J. Dressel, J. R. G. Alonso, M. Waegell, and N. Y. Halpern, Strengthening weak measurements of qubit out-of-time-order correlators, Phys. Rev. A 98, 012132 (2018).
doi: 10.1103/PhysRevA.98.012132

Peer Reviewed

1

Copyright

American Physical Society