4 papers
Record Loss Sets a Rare-Trajectory Limit on Quantum Purification
Jiaxin Liu, Zuoxian Wang, Feng Li +1
Continuous quantum feedback uses time-resolved measurement records to steer monitored systems toward pure states. Yet how the information available to a controller determines the u…
Efficiency-Induced Freezing in Quantum-State Purification
Jiaxin Liu, Zuoxian Wang, Feng Li +1
Any nonzero detection loss qualitatively changes feedback-controlled purification under diffusive monitoring. In every finite dimension, we prove a sharp, dimension-independent cei…
Higher-order noise statistics restore Heisenberg scaling under collective dephasing
Jiaxin Liu, Xing Heng, Zuoxian Wang +1
Noisy-metrology theory characterizes decoherence by its two-point correlation function, equivalently the single-atom coherence time or noise spectrum. We show this is insufficient…
Sub-Ensemble Correlations as a Covariance Geometry
Zuoxian Wang, Yuhao Zhang, Gaopu Hou +6
Conventional practice of spatially resolved detection in diffusion-coupled thermal atomic vapors implicitly treat localized responses as mutually independent. However, in this stud…