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23 February 2012 Coherent mixed with squeezed vacuum light interferometry: parity detection hits the Heisenberg limit
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Abstract
Mach-Zehnder interferometry based on mixing the coherent and the squeezed vacuum states of light has Heisenberg limited capabilities for phase estimation. This is also, because the quantum Cramer-Rao bound on sensitivity of phase estimation with the above interferometric scheme reaches the Heisenberg limit when the inputs are mixed in hear equal proportions. We show that a detection strategy based on the measurement of parity of photon number in one of the output modes of the interferometer saturates the quantum Cramer-Rao bound of the interferometric scheme, and therefore- as a consequence- hits the Heisenberg limit when the inputs are mixed in equal intensities.
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Kaushik Seshadreesan, Petr Anisimov, Hwang Lee, and Jonathan Dowling "Coherent mixed with squeezed vacuum light interferometry: parity detection hits the Heisenberg limit", Proc. SPIE 8272, Advances in Photonics of Quantum Computing, Memory, and Communication V, 82720N (23 February 2012); https://doi.org/10.1117/12.910803
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