Gaussian phase sensitivity of boson-sampling-inspired strategies
- URL: http://arxiv.org/abs/2009.06590v2
- Date: Wed, 24 Mar 2021 14:35:02 GMT
- Title: Gaussian phase sensitivity of boson-sampling-inspired strategies
- Authors: Antonio A. Valido, Juan Jos\'e Garc\'ia-Ripoll
- Abstract summary: We show that input coherent states or squeezing beat the non-classical states proposed in preceding boson-sampling-inspired phase-estimation schemes.
We also develop a novel polychromatic interferometric protocol, demonstrating an enhanced sensitivity with respect to two-mode squeezed-vacuum states.
- Score: 0.0
- License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
- Abstract: In this work we study the phase sensitivity of generic linear interferometric
schemes using Gaussian resources and measurements. Our formalism is based on
the Fisher information. This allows us to separate the contributions of the
measurement scheme, the experimental imperfections, and auxiliary systems. We
demonstrate the strength of this formalism using a broad class of multimode
Gaussian states that includes well-known results from single- and two-mode
metrology scenarios. Using this, we prove that input coherent states or
squeezing beat the non-classical states proposed in preceding
boson-sampling-inspired phase-estimation schemes. We also develop a novel
polychromatic interferometric protocol, demonstrating an enhanced sensitivity
with respect to two-mode squeezed-vacuum states, for which the ideal homodyne
detection is formally shown to be optimal.
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