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We study the sensitivity and resolution of phase measurement in a Mach-Zehnder interferometer with two-mode squeezed vacuum (n̄ photons on average). We show that superresolution and sub-Heisenberg sensitivity is obtained with parity detection. In particular, in our setup, dependence of the signal on the phase evolves n̄ times faster than in traditional schemes, and uncertainty in the phase estimation is better than 1/n̄, and we saturate the quantum Cramer-Rao bound. © 2010 The American Physical Society.

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Physical Review Letters