Endurance of Quantum Coherence in Born-Markov Open Quantum Systems

TL;DR

This paper demonstrates both theoretically and experimentally that in noisy quantum networks, certain quantum coherences between separable states persist indefinitely, regardless of initial configurations, revealing resilience of quantum coherence under specific conditions.

Contribution

It introduces the concept that noise can sustain quantum coherence in open quantum systems, with experimental validation of persistent coherences in noisy quantum networks.

Findings

Quantum coherences can endure indefinitely in noisy quantum networks.

Steady states with surviving coherences are independent of initial particle configurations.

Experimental evidence supports theoretical predictions of coherence endurance.

Abstract

Quantum coherence, the physical property underlying fundamental phenomena such as multi-particle interference and entanglement, has emerged as a valuable resource upon which exotic modern technologies are founded. In general, the most prominent adversary of quantum coherence is noise arising from the interaction of the associated dynamical system with its environment. Under certain conditions, however, the existence of noise may drive quantum and classical systems to endure intriguing nontrivial effects. Along these lines, here we demonstrate, both theoretically and experimentally, that when two indistinguishable particles co-propagate through quantum networks affected by noise, the system always evolves into a steady state in which coherences between certain separable states perpetually prevail. Furthermore, we show that the same steady state with surviving quantum coherences is reached irrespectively of the configuration in which the particles are prepared.