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• W1534851831 abstract "Questions about quantum limits on measurement precision were once viewed from the perspective of how to reduce or avoid the effects of quantum noise. With the advent of quantum information science came a paradigm shift to proving rigorous bounds on measurement precision. These bounds have been interpreted as saying, first, that the best achievable sensitivity scales as 1/n, where n is the number of particles one has available for a measurement and, second, that the only way to achieve this Heisenberg-limited sensitivity is to use quantum entanglement. We review these results and show that using quadratic couplings of n particles to a parameter to be estimated, one can achieve sensitivities that scale as 1/n^2 if one uses entanglement, but even in the absence of any entanglement at any time during the measurement protocol, one can achieve a super-Heisenberg scaling of 1/n^(3/2)" @default.
• W1534851831 created "2016-06-24" @default.
• W1534851831 creator A5007129549 @default.
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• W1534851831 date "2009-01-01" @default.
• W1534851831 modified "2023-09-27" @default.
• W1534851831 title "Quantum metrology from an information theory perspective" @default.
• W1534851831 cites W1835687021 @default.
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• W1534851831 doi "https://doi.org/10.1063/1.3131367" @default.
• W1534851831 hasPublicationYear "2009" @default.
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