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Abstract: We optimize two-mode, entangled, number states of light in the presence ofloss in order to maximize the extraction of the available phase information inan interferometer. Our approach optimizes over the entire available inputHilbert space with no constraints, other than fixed total initial photonnumber. We optimize to maximize the Fisher information, which is equivalent tominimizing the phase uncertainty. We find that in the limit of zero loss theoptimal state is the so-called N00N state, for small loss, the optimal stategradually deviates from the N00N state, and in the limit of large loss theoptimal state converges to a generalized two-mode coherent state, with a finitetotal number of photons. The results provide a general protocol for optimizingthe performance of a quantum optical interferometer in the presence of photonloss, with applications to quantum imaging, metrology, sensing, and informationprocessing.



Autor: Tae-Woo Lee, Sean D. Huver, Hwang Lee, Lev Kaplan, Steven B. McCracken, Changjun Min, Dmitry B. Uskov, Christoph F. Wildfeuer, Ge

Fuente: https://arxiv.org/







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