Heisenberg-limited quantum metrology using collective dephasing
- URL: http://arxiv.org/abs/2103.11612v2
- Date: Wed, 24 Mar 2021 06:30:36 GMT
- Title: Heisenberg-limited quantum metrology using collective dephasing
- Authors: Shingo Kukita, Yuichiro Matsuzaki, Yasushi Kondo
- Abstract summary: Decoherence during the time evolution typically degrades the performance of quantum metrology.
We show, however, that under suitable conditions, this decoherence can be exploited to improve the sensitivity.
- Score: 0.0
- License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
- Abstract: The goal of quantum metrology is the precise estimation of parameters using
quantum properties such as entanglement. This estimation usually consists of
three steps: state preparation, time evolution during which information of the
parameters is encoded in the state, and readout of the state. Decoherence
during the time evolution typically degrades the performance of quantum
metrology and is considered to be one of the major obstacles to realizing
entanglement-enhanced sensing. We show, however, that under suitable
conditions, this decoherence can be exploited to improve the sensitivity.
Assume that we have two axes, and our aim is to estimate the relative angle
between them. Our results reveal that the use of Markvoian collective dephasing
to estimate the relative angle between the two directions affords
Heisenberg-limited sensitivity. Moreover, our scheme based on Markvoian
collective dephasing is robust against environmental noise, and it is possible
to achieve the Heisenberg limit even under the effect of independent dephasing.
Our counterintuitive results showing that the sensitivity is improved by using
the decoherence pave the way to novel applications in quantum metrology.
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