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Quantum Electronics and Laser Science Conference

On the practicality of quantum interferometry using photonic N00N states

Gilbert, Hamrick, Weinstein

Published Jan 1, 2008• 0 citations
Publisher
DOI
10.1109/qels.2008.4552927

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The phase estimation performance of photonic N00N states propagating in an attenuating medium is analyzed. It is shown that the Heisenberg limit is never achieved and that an attenuated separable state of N photons will actually produce a better phase estimate than an equally attenuated N00N state unless the transmittance of the medium is sufficiently high. Thus, for most practical applications with realistic attenuation, N00N-state-based phase estimation actually performs worse than the standard quantum limit. This performance deficit becomes more pronounced as the number of photons in the signal increases.