Quantum interferometry with binary-outcome measurements in the presence of phase diffusion
- 8 July 2014
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review A
- Vol. 90 (1), 013807
- https://doi.org/10.1103/physreva.90.013807
Abstract
Optimal measurement scheme with an efficient data processing is important in quantum-enhanced interferometry. Here we prove that for a general binary-outcome measurement, the simplest data processing based on inverting the average signal can saturate the Cramér-Rao bound. This idea is illustrated by binary-outcome homodyne detection, even-odd photon counting (i.e., parity detection), and zero-nonzero photon counting that have achieved super-resolved interferometric fringe and shot-noise limited sensitivity in coherent-light Mach-Zehnder interferometer. The roles of phase diffusion are investigated in these binary-outcome measurements. We find that the diffusion degrades the fringe resolution and the achievable phase sensitivity. Our analytical results confirm that the zero-nonzero counting can produce a slightly better sensitivity than that of the parity detection, as demonstrated in a recent experiment.Keywords
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Funding Information
- National Natural Science Foundation of China (11174028, 11274036, 11322542, 2014CB848701, 2011JBZ013)
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