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Heisenberg-Limited Qubit Read-Out with Two-Mode Squeezed Light

Author(s)
Didier, Nicolas; Kamal, Archana; Oliver, William D.; Blais, Alexandre; Clerk, Aashish A.
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Abstract
We show how to use two-mode squeezed light to exponentially enhance cavity-based dispersive qubit measurement. Our scheme enables true Heisenberg-limited scaling of the measurement, and crucially, it is not restricted to small dispersive couplings or unrealistically long measurement times. It involves coupling a qubit dispersively to two cavities and making use of a symmetry in the dynamics of joint cavity quadratures (a so-called quantum-mechanics-free subsystem). We discuss the basic scaling of the scheme and its robustness against imperfections, as well as a realistic implementation in circuit quantum electrodynamics.
Date issued
2015-08
URI
http://hdl.handle.net/1721.1/98281
Department
Lincoln Laboratory; Massachusetts Institute of Technology. Research Laboratory of Electronics
Journal
Physical Review Letters
Publisher
American Physical Society
Citation
Didier, Nicolas, Archana Kamal, William D. Oliver, Alexandre Blais, and Aashish A. Clerk. "Heisenberg-Limited Qubit Read-Out with Two-Mode Squeezed Light." Phys. Rev. Lett. 115, 093604 (August 2015). © 2015 American Physical Society
Version: Final published version
ISSN
0031-9007
1079-7114

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