Abstract
The phase sensitivity of a Mach–Zehnder interferometer utilizing quantum entanglement is analyzed for a coherent state input. The results show that the Heisenberg limit in the measurement of the phase shift is obtainable with a coherent input. Moreover, the scheme turns out to be immune to the imperfect detector efficiencies. This suggests another promising route for implementing sub-shot-noise measurement schemes.
© 2009 Optical Society of America
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