Tuning the universality class of phase transitions by feedback: Open quantum systems beyond dissipation

Autor:	Ivanov, D. A., Ivanova, T. Yu., Caballero-Benitez, S. F., Mekhov, I. B.
Rok vydání:	2021
Předmět:	Quantum Physics Condensed Matter - Other Condensed Matter Condensed Matter - Quantum Gases Physics - Atomic Physics Physics - Optics
Zdroj:	Phys. Rev. A 104, 033719 (2021)
Druh dokumentu:	Working Paper
DOI:	10.1103/PhysRevA.104.033719
Popis:	We shift the paradigm of feedback control from the control of quantum states to the control of phase transitions in quantum systems. We show that feedback allows tuning the universality class of phase transitions via modifying its critical exponent. We expand our previous treatment [D. A. Ivanov, T. Yu. Ivanova, S. F. Caballero-Benitez, and I. B. Mekhov, Phys. Rev. Lett. 124, 010603 (2020)] of Dicke model and go beyond the approximation of adiabatically eliminated light field. Both linearized and nonlinear models of spin ensembles are considered. The tunability of quantum fluctuations near the critical point by the feedbacks of nontrivial shapes is explained by considering the fluctuation spectra and the system behavior at single quantum trajectories. Comment: accepted in Phys. Rev. A
Databáze:	arXiv
Externí odkaz:	http://arxiv.org/abs/2107.02833 Zobrazit plný text záznamu View this record from Arxiv