Enhancing Parameter Estimation Precision in a Dissipative Environment with Two‐Photon Driving

Abstract

The frequency estimation of an optical cavity field suffering from an unavoidable dissipative environment is investigated. Generally, dissipative noise significantly reduces the precision. Here, it is found that two‐photon driving can improve measurement precision by resisting the noise. Moreover, over a long duration, the frequency uncertainty can be minimized with the right magnitude of the parametric two‐photon drive, which is in sharp contrast to the uncertainty tending to infinity without two‐photon driving. The results show that two‐photon driving can achieve ultrasensitive measurement in a dissipative environment under the long‐encoding‐time condition.

Joint remote state preparation in multi-hop network under noisy environment

“…For example, correlated Pauli noise channel with memory of consecutive actions could be considered [73,74], which can enhance the coherence of multiqubit states [75,76]. The detrimental noise could also be suppressed by two-photon driving [77], or through the improvement of entangled states by quantum-junp-based feedback [78].…”

Parameter estimation and quantum entanglement in PT symmetrical cavity magnonics system

“…However, it does not mean that the measurement uncertainty of ω 1 will be 0 in its physical condition. Quantum fluctuations [22,23] and statistical noises [24] have shown to be strong at the exceptional point. In addition, the time required to prepare the system steady-state will diverge at the exceptional point.…”