Journal
JOURNAL OF MODERN OPTICS
Volume 55, Issue 19-20, Pages 3319-3327Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1080/09500340802428298
Keywords
quantum entanglement; Heisenberg limited interferometry; NOON state; correlated Fock states; parity measurement
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Phase measurement using a lossless Mach-Zehnder interferometer with certain entangled N-photon states can lead to a phase sensitivity of the order of 1/N, the Heisenberg limit. However, previously considered output measurement schemes are different for different input states to achieve this limit. We show that it is possible to achieve this limit just by the parity measurement for all the commonly proposed entangled states. Based on the parity measurement scheme, the reductions of the phase sensitivity in the presence of photon loss are examined for the various input states.
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