Related papers: Phase driven unconventional superradiance phase transition in non-Hermitian cascaded quantum Rabi cavities

Phase driven unconventional superradiance phase transition in non-Hermitian cascaded quantum Rabi cavities

URL: http://arxiv.org/abs/2406.16576v2
Date: Tue, 2 Jul 2024 05:32:54 GMT
Title: Phase driven unconventional superradiance phase transition in non-Hermitian cascaded quantum Rabi cavities
Authors: Shujie Cheng, Shuai-Peng Wang, G. D. M. Neto, Gao Xianlong,
Abstract summary: This study investigates phase-driven symmetry breaking leading to superradiance phase transitions in non-Hermitian quantum Rabi cavities. We analytically derive the superradiance phase boundary, validated by observables. We identify phase-driven first- and second-order superradiance phase transitions, focusing on the quantum criticality of the second-order transition.
Score: 0.0
License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Abstract: This study investigates phase-driven symmetry breaking leading to superradiance phase transitions in cascaded non-Hermitian quantum Rabi cavities. Non-Hermiticity is introduced via the phase coupling $\varphi$ between the atom and the optical field. In the thermodynamic limit of the quantum harmonic oscillator, we analytically derive the superradiance phase boundary, validated by observables. An unconventional quantum phase transition without a Hermitian analogue arises when $|\varphi|=\frac{\pi}{4}$ or $|\varphi|=\frac{3\pi}{4}$, where the phase boundary is uniquely determined by the cavity coupling, at $\mathcal{J}=\frac{1}{2}$, independent of the atom-photon coupling strength $g$. For other $\varphi$, the phase boundary relies on both $\mathcal{J}$ and $g$, similar to the scenario observed in Hermitian systems. Furthermore, we identify phase-driven first- and second-order superradiance phase transitions, focusing on the quantum criticality of the second-order transition by determining the critical exponents and the universality class. The feasibility of experimental realization is also discussed, aiming to inspire further studies on non-Hermitian superradiance quantum phase transitions.

Related papers

SUSY Quantum Mechanics, (non)-Analyticity and $\ldots$ Phase Transitions [55.2480439325792]
It is shown by analyzing the $1D$ Schr"odinger equation the discontinuities in the coupling constant can occur in both the energies and the eigenfunctions.
arXiv Detail & Related papers (2024-09-04T21:10:36Z)
Probing quantum floating phases in Rydberg atom arrays [61.242961328078245]
We experimentally observe the emergence of the quantum floating phase in 92 neutral-atom qubits. The site-resolved measurement reveals the formation of domain walls within the commensurate ordered phase. As the experimental system sizes increase, we show that the wave vectors approach a continuum of values incommensurate with the lattice.
arXiv Detail & Related papers (2024-01-16T03:26:36Z)
Many-body phase transitions in a non-Hermitian Ising chain [0.8749675983608172]
We study many-body phase transitions in a one-dimensional ferromagnetic transversed field Ising model with an imaginary field. We show that the system exhibits three phase transitions: one second-order phase transition and two $mathcalPT$ phase transitions.
arXiv Detail & Related papers (2023-11-19T06:32:12Z)
Multipartite Entanglement in the Measurement-Induced Phase Transition of the Quantum Ising Chain [77.34726150561087]
External monitoring of quantum many-body systems can give rise to a measurement-induced phase transition. We show that this transition extends beyond bipartite correlations to multipartite entanglement.
arXiv Detail & Related papers (2023-02-13T15:54:11Z)
Measurement phase transitions in the no-click limit as quantum phase transitions of a non-hermitean vacuum [77.34726150561087]
We study phase transitions occurring in the stationary state of the dynamics of integrable many-body non-Hermitian Hamiltonians. We observe that the entanglement phase transitions occurring in the stationary state have the same nature as that occurring in the vacuum of the non-hermitian Hamiltonian.
arXiv Detail & Related papers (2023-01-18T09:26:02Z)
Geometric phases along quantum trajectories [58.720142291102135]
We study the distribution function of geometric phases in monitored quantum systems. For the single trajectory exhibiting no quantum jumps, a topological transition in the phase acquired after a cycle. For the same parameters, the density matrix does not show any interference.
arXiv Detail & Related papers (2023-01-10T22:05:18Z)
Staggered quantum phases of dipolar bosons at finite temperatures [0.0]
We study finite-temperature phase transitions of quantum phases of dipolar bosons in a two-dimensional optical lattice. We estimate the critical temperature of the staggered superfluid to normal fluid transition and show that this transition is of the Kosterlitz-Thouless type. Our study paves a way to observe novel staggered quantum phases in recent dipolar optical lattice experiments.
arXiv Detail & Related papers (2022-11-09T11:44:45Z)
Continuous phase transition induced by non-Hermiticity in the quantum contact process model [44.58985907089892]
How the property of quantum many-body system especially the phase transition will be affected by the non-hermiticity remains unclear. We show that there is a continuous phase transition induced by the non-hermiticity in QCP. We observe that the order parameter and susceptibility display infinitely even for finite size system, since non-hermiticity endows universality many-body system with different singular behaviour from classical phase transition.
arXiv Detail & Related papers (2022-09-22T01:11:28Z)
Observation of a non-Hermitian phase transition in an optical quantum gas [0.0]
Quantum gases of light, as photons or polariton condensates in optical microcavities, are collective quantum systems. We experimentally demonstrate a non-Hermitian phase transition of a photon Bose-Einstein condensate to a new dissipative phase.
arXiv Detail & Related papers (2020-10-29T17:59:10Z)
Resilience of the superradiant phase against $\mathbf {A^2}$ effects in the quantum Rabi dimer [0.0]
We study the quantum criticality of a two-site model combining quantum Rabi models with hopping interaction. We find that the model allows the appearance of a superradiant quantum phase transition (QPT) even in the presence of strong $mathbfA2$ terms. Our work provides a way to the study of phase transitions in presence of the $mathbfA2$ terms and offers the prospect of investigating quantum-criticality physics and quantum devices in many-body systems.
arXiv Detail & Related papers (2020-03-03T04:14:13Z)

This list is automatically generated from the titles and abstracts of the papers in this site.