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- Title
Ancilla-assisted frequency estimation under phase covariant noises with Greenberger–Horne–Zeilinger states.
- Authors
Cai, Rui-Jie; Zhong, Wei; Zhou, Lan; Sheng, Yu-Bo
- Abstract
It has been demonstrated that the optimal sensitivity achievable with Greenberger–Horne–Zeilinger states is the same as that with uncorrelated probes in the frequency estimation in the presence of uncorrelated Markovian dephasing [Huelga et al. Phys Rev Lett 79: 3865 (1997)]. Here, we extend this issue by examining the optimal frequency sensitivities achievable by the use of ancilla-assisted strategy, which has been proposed recently for robust phase estimation. We present the ultimate frequency sensitivities bounded by the quantum Fisher information for a general case in the presence of Markovian covariant phase noises, and the optimal measurement observables that can saturate the theoretical sensitivity bounds. We also demonstrate the effectiveness of the ancilla-assisted strategy for preserving frequency sensitivities suffering from specific physically ground noises.
- Publication
Quantum Information Processing, 2020, Vol 19, Issue 10, p1
- ISSN
1570-0755
- Publication type
Article
- DOI
10.1007/s11128-020-02867-3