https://doi.org/10.1140/epjc/s10052-024-13275-7
Regular Article - Theoretical Physics
Quantum metrology of Schwinger effect
1
Department of Physics, and Collaborative Innovation Center for Quantum Effects and Applications, Hunan Normal University, 410081, Changsha, Hunan, China
2
Institute of Interdisciplinary Studies, Hunan Normal University, 410081, Changsha, Hunan, China
Received:
3
March
2024
Accepted:
20
August
2024
Published online:
4
September
2024
We propose a scheme for the quantum metrology of the Schwinger effect and the dynamics of Gaussian interference power (GIP). The ongoing reliability of the estimation strategy for the probe state prepared in particle–particle modes is demonstrated. Although the GIP sensitively depends on the strength of the external electric field and the transverse momentum, the advantage of quantum parameter estimation is still maintained even in the limit of an infinite electric field and zero transverse momentum. It is shown that the entanglement between the particle–particle modes provides a guarantee for obtaining higher precision for the black-box estimation. In contrast, for the probe state prepared in particle–antiparticle modes, the advantage of quantum parameter estimation can also be ensured even though there is no entanglement in the probe state. Put differently, some non-entanglement quantum correlations play the role of quantum resources in the estimation for particle–antiparticle modes.
Tingting Fan and Qianqian Liu contributed equally to this work.
© The Author(s) 2024
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