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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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.
DepartmentLincoln Laboratory; Massachusetts Institute of Technology. Research Laboratory of Electronics
Physical Review Letters
American Physical Society
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
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