Fluctuation-enhanced quantum metrology
- URL: http://arxiv.org/abs/2003.13010v1
- Date: Sun, 29 Mar 2020 12:12:59 GMT
- Title: Fluctuation-enhanced quantum metrology
- Authors: Yu Chen, Hongzhen Chen, Jing Liu, Zibo Miao, and Haidong Yuan
- Abstract summary: We show, contrary to the conventional belief, the fluctuation can be used to improve the precision limits in quantum metrology.
We provide explicit protocols, which employs the adaptive quantum error correction, to achieve the higher precision limits with the fluctuating fields.
- Score: 7.803101992660843
- License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
- Abstract: The main obstacle for practical quantum technology is the noise, which can
induce the decoherence and destroy the potential quantum advantages. The
fluctuation of a field, which induces the dephasing of the system, is one of
the most common noises and widely regarded as detrimental to quantum
technologies. Here we show, contrary to the conventional belief, the
fluctuation can be used to improve the precision limits in quantum metrology
for the estimation of various parameters. Specifically, we show that for the
estimation of the direction and rotating frequency of a field, the achieved
precisions at the presence of the fluctuation can even surpass the highest
precision achievable under the unitary dynamics which have been widely taken as
the ultimate limit. We provide explicit protocols, which employs the adaptive
quantum error correction, to achieve the higher precision limits with the
fluctuating fields. Our study provides a completely new perspective on the role
of the noises in quantum metrology. It also opens the door for higher
precisions beyond the limit that has been believed to be ultimate.
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