Cooperation between coherent control and noises in quantum metrology
- URL: http://arxiv.org/abs/1801.07563v2
- Date: Tue, 21 Nov 2023 01:51:54 GMT
- Title: Cooperation between coherent control and noises in quantum metrology
- Authors: Yu Chen, Zibo Miao, and Haidong Yuan
- Abstract summary: We study the cooperation between coherent control and noises in open spin systems.
The cooperative scheme proposed here outperforms the standard scheme, with higher precision achieved.
We show that the coupling between different spins can help realize non-local parametrization under the cooperative scheme.
- Score: 2.5007368668594925
- License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
- Abstract: In this paper we study the cooperation between coherent control and noises in
open spin systems, aiming to demonstrate that such cooperation can provide new
possibilities for parametrization in quantum metrology. The cooperative scheme
proposed here outperforms the standard scheme, with higher precision achieved.
More specifically, we illustrate the effect of cooperative interaction between
coherent control and noises in conventional single-spin systems described by
Lindblad master equations, with the magnitude of a magnetic field taken as the
parameter to be estimated and encoded in the noisy dynamics besides the
Hamiltonian. The scenarios of both spontaneous emission and dephasing noise
have been analyzed, where the associated quantum Fisher information has been
given. Furthermore, it has been demonstrated that in the realm where quantum
metrology is mostly applied in practice, the precision limit under the
cooperative scheme in the presence of noises can surpass the ultimate precision
limit under the unitary dynamics. On the other hand, multiple-spin systems have
also been considered. We show that the coupling between different spins can
help realize non-local parametrization under the cooperative scheme, with the
ground state made entangled. This thus leads to the improvement of precision
limit, which has been proved and visualized in our paper.
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