Efficiency-Induced Freezing in Quantum-State Purification

Abstract:Any nonzero detection loss qualitatively changes feedback-controlled purification under diffusive monitoring. In every finite dimension, we prove a sharp, dimension-independent ceiling on the decay of trajectory-averaged impurity moments, uniformly over admissible predictable feedback this http URL unit efficiency, this ceiling becomes independent of moment order above a critical value and is attained on extremal rank-two quantum-nondemolition (QND) faces. For generic observable spectra, a determinant-root law precludes every full-rank state from attaining this boundary rate over an explicit moment-order interval. For qubits at $0<\eta<1$, the frozen rate is the exact optimum, set by rare, persistently mixed trajectories. Parameter-free finite-action scaling functions resolve both the rounded QND moment-order transition and the near-unit QND--always-unbiased crossover.

arXiv:2607.07434 [quant-ph]

(or arXiv:2607.07434v2 [quant-ph] for this version)

https://doi.org/10.48550/arXiv.2607.07434 Focus to learn more arXiv-issued DOI via DataCite

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