Quantum Cramer-Rao bound and parity measurement

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Conference Proceeding

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We show, by using parity detection, that the phase estimate obtained from the linear error propagation formula, indeed saturates the lower bound set by maximizing quantum Fisher information for several of the well-known states, proposed for the Heisenberg limited interferometry. Our results show that one can achieve the quantum Cramér-Rao bound, by simply counting the number of photons which is not very far from actual realization. © 2010 Copyright SPIE - The International Society for Optical Engineering.

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Proceedings of SPIE - The International Society for Optical Engineering

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