Liouvillian spectral collapse in the Scully-Lamb laser model

no code implementations • 9 Mar 2021 • Fabrizio Minganti, Ievgen I. Arkhipov, Adam Miranowicz, Franco Nori

Despite the nonequilibrium nature of the laser, the Landau theory of thermal phase transitions, applied directly to the Scully-Lamb laser model (SLLM), indicates that the laser threshold is a second-order phase transition, associated with a $U(1)$ spontaneous symmetry breaking (SSB).

Quantum Physics Statistical Mechanics

Generating high-order quantum exceptional points in synthetic dimensions

no code implementations • 26 Feb 2021 • Ievgen I. Arkhipov, Fabrizio Minganti, Adam Miranowicz, Franco Nori

Here, by considering the full quantum dynamics of a quadratic Liouvillian superoperator, we introduce a simple and effective method for engineering NHHs with high-order quantum EPs, derived from evolution matrices of system operators moments.

Quantum Physics

Shortcuts to Adiabaticity for the Quantum Rabi Model: Efficient Generation of Giant Entangled Cat States via Parametric Amplification

no code implementations • 10 Aug 2020 • Ye-Hong Chen, Wei Qin, Xin Wang, Adam Miranowicz, Franco Nori

We propose a method for the fast generation of nonclassical ground states of the Rabi model in the ultrastrong and deep-strong coupling regimes via the shortcuts-to-adiabatic (STA) dynamics.

Quantum Physics