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• W2035013537 abstract "Quantum-enhanced measurements use quantum mechanical effects in order to enhance the sensitivity of the measurement of classical quantities, such as the length of an optical cavity. The major goal is to beat the standard quantum limit (SQL), i.e. a uncertainty of order 1/sqrt{N}, where N is the number of quantum resources (e.g. the number of photons or atoms used), and to achieve a scaling 1/N, known as the Heisenberg limit. So far very few experiments have demonstrated an improvement over the SQL. The required quantum states are generally highly entangled, difficult to produce, and very prone to decoherence. Here we show that Heisenberg limited measurements can be achieved without the use of entangled states by coupling the quantum resources to a common environment which can be measured at least in part. The method is robust under decoherence, and in fact the parameter dependence of collective decoherence itself can be used to reach a 1/N scaling." @default.
• W2035013537 created "2016-06-24" @default.
• W2035013537 creator A5031547137 @default.
• W2035013537 creator A5055317055 @default.
• W2035013537 date "2011-03-01" @default.
• W2035013537 modified "2023-09-30" @default.
• W2035013537 title "Heisenberg-limited sensitivity with decoherence-enhanced measurements" @default.
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• W2035013537 doi "https://doi.org/10.1038/ncomms1220" @default.
• W2035013537 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/21364562" @default.
• W2035013537 hasPublicationYear "2011" @default.
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