Ultimate precision limit of noise sensing and dark matter search
- URL: http://arxiv.org/abs/2208.13712v2
- Date: Sun, 26 Mar 2023 03:05:58 GMT
- Title: Ultimate precision limit of noise sensing and dark matter search
- Authors: Haowei Shi and Quntao Zhuang
- Abstract summary: We model axion dark matter as a quantum channel and derive the fundamental precision limit of noise sensing.
An entanglement-assisted strategy based on two-mode squeezed vacuum is demonstrated optimal.
Our results highlight the necessity of entanglement assistance and microwave photon counting in dark matter search.
- Score: 1.14219428942199
- License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
- Abstract: The nature of dark matter is unknown and calls for a systematical search. For
axion dark matter, such a search relies on finding feeble random noise arising
from the weak coupling between dark matter and microwave haloscopes. We model
such process as a quantum channel and derive the fundamental precision limit of
noise sensing. An entanglement-assisted strategy based on two-mode squeezed
vacuum is thereby demonstrated optimal, while the optimality of a single-mode
squeezed vacuum is found limited to the lossless case. We propose a `nulling'
measurement (squeezing and photon counting) to achieve the optimal
performances. In terms of the scan rate, even with 20-decibel of strength,
single-mode squeezing still underperforms the vacuum limit which is achieved by
photon counting on vacuum input; while the two-mode squeezed vacuum provides
large and close-to-optimum advantage over the vacuum limit, thus more exotic
quantum resources are no longer required. Our results highlight the necessity
of entanglement assistance and microwave photon counting in dark matter search.
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