Metrological Advantages in Seeded and Lossy Nonlinear Interferometers
- URL: http://arxiv.org/abs/2311.14172v1
- Date: Thu, 23 Nov 2023 19:23:20 GMT
- Title: Metrological Advantages in Seeded and Lossy Nonlinear Interferometers
- Authors: Jasper Kranias, Guillaume Thekkadath, Khabat Heshami, Aaron Z.
Goldberg
- Abstract summary: We calculate analytical expressions for the quantum Fisher information (QFI) of nonlinear interferometers under lossy conditions and with coherent-state seeding.
We find the threshold on the internal loss at which the quantum advantage vanishes, specify when and how much coherent-state seeding optimally counters internal loss.
- Score: 0.0
- License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
- Abstract: The quantum Fisher information (QFI) bounds the sensitivity of a quantum
measurement, heralding the conditions for quantum advantages. We aim to find
conditions at which quantum advantage can be realized in single-parameter phase
sensing with nonlinear interferometers. Here, we calculate analytical
expressions for the QFI of nonlinear interferometers under lossy conditions and
with coherent-state seeding. We normalize the results based on the number of
photons going through the phase-inducing element, which eliminates some of the
previously declared metrological advantages. We analyze the performance of
nonlinear interferometers in a variety of geometries and robustness of the
quantum advantage with respect to internal and external loss through direct
comparison with a linear interferometer. We find the threshold on the internal
loss at which the quantum advantage vanishes, specify when and how much
coherent-state seeding optimally counters internal loss, and show that a
sufficient amount of squeezing confers to the quantum advantages robustness
against external loss and inefficient detection.
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