Journal
PHYSICAL REVIEW LETTERS
Volume 100, Issue 7, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.100.073601
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We show that the phase sensitivity Delta theta of a Mach-Zehnder interferometer illuminated by a coherent state in one input port and a squeezed-vacuum state in the other port is (i) independent of the true value of the phase shift and (ii) can reach the Heisenberg limit Delta theta similar to 1/N-T, where N-T is the average number of input particles. We also demonstrate that the Cramer-Rao lower bound of phase sensitivity, Delta theta similar to 1/root|alpha|(2)e(2r)+sinh(2)r, can be saturated for arbitrary values of the squeezing parameter r and the amplitude of the coherent mode alpha by using a Bayesian phase inference protocol.
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