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Phase estimation in lossy optical interferometry without a reference beam
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DOI：10.1088/1572-9494/ade6da.png)
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Abstract
En 中文
We investigate phase estimation in a lossy interferometer using entangled coherent states, with a particular focus on a scenario where no reference beam is employed. By calculating the quantum Fisher information, we reveal two key results: (1) the metrological equivalence between scenarios with and without a reference beam, established under ideal lossless conditions for the two-phase-shifting configuration, breaks down in the presence of photon loss, and (2) the pronounced inferior performance of ECSs relative to NOON states, observed in the presence of a reference beam, disappears in its absence.
Keywords:
quantum phase estimation
quantum Fisher information
entangled coherent states
NOON states
reference beam
Journal
C
IF:
2.9
Papers:
158
Citations:
4.8K