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Title: Quantum sensors based on weak-value amplification cannot overcome decoherence
Authors: Knee, G.C.
Briggs, G.A.D.
Benjamin, S.C. 
Gauger, E.M.
Issue Date: 16-Jan-2013
Citation: Knee, G.C., Briggs, G.A.D., Benjamin, S.C., Gauger, E.M. (2013-01-16). Quantum sensors based on weak-value amplification cannot overcome decoherence. Physical Review A - Atomic, Molecular, and Optical Physics 87 (1) : -. ScholarBank@NUS Repository.
Abstract: Sensors that harness exclusively quantum phenomena (such as entanglement) can achieve superior performance compared to those employing only classical principles. Recently, a technique based on postselected, weakly performed measurements has emerged as a method of overcoming technical noise in the detection and estimation of small interaction parameters, particularly in optical systems. The question of which other types of noise may be combated remains open. We here analyze whether the effect can overcome decoherence in a typical field-sensing scenario. Benchmarking a weak, postselected measurement strategy against a strong, direct strategy, we conclude that no advantage is achievable, and that even a small amount of decoherence proves catastrophic to the weak-value amplification technique. © 2013 American Physical Society.
Source Title: Physical Review A - Atomic, Molecular, and Optical Physics
ISSN: 10502947
DOI: 10.1103/PhysRevA.87.012115
Appears in Collections:Staff Publications

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