Feedback-Induced Quantum Phase Transitions Using Weak Measurements
arXiv:1903.10089 · doi:10.1103/PhysRevLett.124.010603
Abstract
We show that applying feedback and weak measurements to a quantum system induces phase transitions beyond the dissipative ones. Feedback enables controlling essentially quantum properties of the transition, i.e., its critical exponent, as it is driven by the fundamental quantum fluctuations due to measurement. Feedback provides the non-Markovianity and nonlinearity to the hybrid quantum-classical system, and enables simulating effects similar to spin-bath problems and Floquet time crystals with tunable long-range (long-memory) interactions.
to be published in Phys. Rev. Lett
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