Gaussian quantum metrology in a dissipative environment
- URL: http://arxiv.org/abs/2107.13161v2
- Date: Wed, 3 Nov 2021 02:09:01 GMT
- Title: Gaussian quantum metrology in a dissipative environment
- Authors: Wei Wu, Jun-Hong An
- Abstract summary: We propose a new scheme for high-precision quantum metrology.
The scheme achieves the precision of a sub-Heisenberg limit in the ideal case.
A mechanism to remove the no-go theorem is found in the non-Markovian dynamics.
- Score: 4.8229512034776
- License: http://creativecommons.org/licenses/by/4.0/
- Abstract: Quantum metrology pursues high-precision measurements of physical quantities
by using quantum resources. However, the decoherence generally hinders its
performance. Previous work found that the metrological error tends to diverge
in the long-encoding-time regime due to the Born-Markovian approximate
decoherence, which is called the no-go theorem of noisy quantum metrology. Here
we propose a Gaussian quantum metrology scheme using bimodal quantized optical
fields as the quantum probe. It achieves the precision of a sub-Heisenberg
limit in the ideal case. However, the Markovian decoherence causes the
metrological error contributed by the center-of-mass mode of the probe to be
divergent. A mechanism to remove this ostensible no-go theorem is found in the
non-Markovian dynamics. Our result gives an efficient way to realize
high-precision quantum metrology in practical continuous-variable systems.
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