Criticality of environmental information obtainable by dynamically controlled quantum probes

ANALIA ZWICK; GONZALO A. ALVAREZ; GERSHON KURIZKI

Buenos Aires

Workshop; Frontiers In Physical Sciences; 2016

ICAS - Max Planck - Alexander von Humboldt Foundation

A universal approach to decoherence control combined with quantum estimation theoryreveals a critical behavior, akin to a phase-transition, of the information obtainable by aqubit-probe concerning the memory time of environmental fluctuations of a generalizedOrnstein-Uhlenbeck processes. The criticality emerges only when the probe is subject tosuitable dynamical control aimed at inferring the memory-time. A sharp transition isanticipated between two dynamical phases characterized by either a short or longmemory-time compared to the probing-time. This phase-transition of the environmentalinformation is a fundamental feature that characterizes open quantum-system dynamics and is important for attaining the highest estimation precision of the environment memory-time under experimental limitations.