Signal detection without finite-energy limits to quantum resolution |
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Authors: | Alfredo Luis |
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Affiliation: | Departamento de Óptica, Facultad de Ciencias Físicas, Universidad Complutense, 28040 Madrid, Spain |
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Abstract: | We show that there are extremely simple signal detection schemes where the finiteness of energy resources places no limit on the resolution. On the contrary, larger resolution can be obtained with lower energy. To this end the generator of the signal-dependent transformation encoding the signal information on the probe state must be different from the energy. We show that the larger the deviation of the probe state from being the minimum-uncertainty state, the better the resolution. |
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Keywords: | Quantum metrology Quantum limits Uncertainty relations |
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