Journal
PHYSICAL REVIEW A
Volume 99, Issue 2, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevA.99.022106
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Funding
- National Natural Science Foundation of China [61701139]
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Quantum-enhanced phase estimation paves the way for precision measurements and is of great realistic significance. In this paper we theoretically investigate the second-order nonlinear phase estimation using a coherent state and parity measurement. A numerical expression of the parity signal is derived, and its visibility is analyzed. The resolution and sensitivity of the signal are compared to a linear phase estimation protocol with the same input and measurement. Additionally, by using the phase-averaging approach, we make an attempt at unveiling the lowdown on a conclusive sensitivity limit without external phase reference. Finally, the effects of several realistic scenarios on the resolution and sensitivity are studied, including photon loss, imperfect detector, those which are a combination thereof, and unbalanced beam splitter.
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