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Article Dans Une Revue Physical Review A : Atomic, molecular, and optical physics [1990-2015] Année : 2016

Measurement of a microwave field amplitude beyond the standard quantum limit

Résumé

We report a quantum measurement beyond the standard quantum limit (SQL) for the amplitude of a small displacement acting on a cavity field. This measurement uses as a resource an entangled mesoscopic state, prepared by the resonant interaction of a circular Rydberg atom with a field stored in a superconducting cavity. We analyze the measurement process in terms of Fisher information and prove that it is, in principle, optimal. The experimental precision achieved, 2.4 dB below the SQL, is well understood in terms of experimental imperfections. This method could be transposed to other systems, particularly to circuit QED, for the precise measurement of weak forces acting on oscillators.

Dates et versions

hal-01369507 , version 1 (21-09-2016)

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Citer

M. Penasa, S. Gerlich, T. Rybarczyk, V. Métillon, M. Brune, et al.. Measurement of a microwave field amplitude beyond the standard quantum limit. Physical Review A : Atomic, molecular, and optical physics [1990-2015], 2016, 94 (2), pp.022313. ⟨10.1103/PhysRevA.94.022313⟩. ⟨hal-01369507⟩
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