Phase transitions and thermodynamic cycles in the broken PT-regime
- URL: http://arxiv.org/abs/2308.06176v2
- Date: Thu, 15 Feb 2024 20:26:26 GMT
- Title: Phase transitions and thermodynamic cycles in the broken PT-regime
- Authors: Andreas Fring and Marta Reboiro
- Abstract summary: We propose a new type of quantum thermodynamic cycle whose efficiency is greater than the one of the classical Carnot cycle.
In our model this type of cycle only exists in the low temperature regime in the spontaneously broken parity-time-reversal (PT) symmetry regime of a non-Hermitian quantum theory.
- Score: 0.0
- License: http://creativecommons.org/licenses/by/4.0/
- Abstract: We propose a new type of quantum thermodynamic cycle whose efficiency is
greater than the one of the classical Carnot cycle for the same conditions for
a system when viewed as homogeneous. In our model this type of cycle only
exists in the low temperature regime in the spontaneously broken
parity-time-reversal (PT) symmetry regime of a non-Hermitian quantum theory and
does not manifest in the PT-symmetric regime. We discuss this effect for an
ensemble based on a model of a single boson coupled in a non-Hermitian way to a
bath of different types of bosons with and without a time-dependent boundary.
The cycle can not be set up when considering our system as heterogeneous, i.e.
undergoing a first order phase transition. Within that interpretation we find
that the entropy is vanishing throughout the spontaneously broken PT-regime.
Related papers
- Thermodynamic Roles of Quantum Environments: From Heat Baths to Work Reservoirs [49.1574468325115]
Environments in quantum thermodynamics usually take the role of heat baths.
We show that within the same model, the environment can take three different thermodynamic roles.
The exact role of the environment is determined by the strength and structure of the coupling.
arXiv Detail & Related papers (2024-08-01T15:39:06Z) - Revealing spontaneous symmetry breaking in continuous time crystals [17.62738825431278]
Spontaneous symmetry breaking leads to a novel state of matter named continuous time crystal (CTC)
We propose and experimentally realize two types of CTCs based on distinct mechanisms: manifold topology and near-chaotic motion.
Our work provides general recipes for the realization of CTCs, and paves the way for exploring CTCs in various systems.
arXiv Detail & Related papers (2024-07-10T14:27:06Z) - Directing entanglement spreading by means of a quantum East/West
heterojunction structure [10.033171830313124]
We extend the translationally invariant quantum East model to an inhomogeneous chain with East/West heterojunction structure.
We observe a cyclic entanglement entropy spreading in the heterojunction during time evolution, which can be regarded as continuous cycles in a quantum heat engine.
arXiv Detail & Related papers (2023-12-03T01:48:35Z) - Entanglement phase transition due to reciprocity breaking without
measurement or post-selection [59.63862802533879]
EPT occurs for a system undergoing purely unitary evolution.
We analytically derive the entanglement entropy out of and at the critical point for the $l=1$ and $l/N ll 1$ case.
arXiv Detail & Related papers (2023-08-28T14:28:59Z) - Entanglement entropy distinguishes PT-symmetry and topological phases in
a class of non-unitary quantum walks [0.0]
We calculate the hybrid entanglement entropy between coin and walker degrees of freedom in a non-unitary quantum walk.
An analysis at long times reveals that the quantum walk can indefinitely sustain hybrid entanglement in the unbroken symmetry phase even when gain and loss mechanisms are present.
arXiv Detail & Related papers (2022-12-14T19:01:15Z) - Phase transitions as a manifestation of spontaneous unitarity violation [0.0]
We argue that singling out a global choice for the ordered state is in fact forbidden under unitary time evolution.
We argue that the observation of phase transitions in our everyday world presents a manifestation of the unitarity of quantum dynamics itself being spontaneously broken.
arXiv Detail & Related papers (2022-09-09T12:32:13Z) - Gauge Quantum Thermodynamics of Time-local non-Markovian Evolutions [77.34726150561087]
We deal with a generic time-local non-Markovian master equation.
We define current and power to be process-dependent as in classical thermodynamics.
Applying the theory to quantum thermal engines, we show that gauge transformations can change the machine efficiency.
arXiv Detail & Related papers (2022-04-06T17:59:15Z) - Fast Thermalization from the Eigenstate Thermalization Hypothesis [69.68937033275746]
Eigenstate Thermalization Hypothesis (ETH) has played a major role in understanding thermodynamic phenomena in closed quantum systems.
This paper establishes a rigorous link between ETH and fast thermalization to the global Gibbs state.
Our results explain finite-time thermalization in chaotic open quantum systems.
arXiv Detail & Related papers (2021-12-14T18:48:31Z) - Observation of Time-Crystalline Eigenstate Order on a Quantum Processor [80.17270167652622]
Quantum-body systems display rich phase structure in their low-temperature equilibrium states.
We experimentally observe an eigenstate-ordered DTC on superconducting qubits.
Results establish a scalable approach to study non-equilibrium phases of matter on current quantum processors.
arXiv Detail & Related papers (2021-07-28T18:00:03Z) - Analog cosmological reheating in an ultracold Bose gas [58.720142291102135]
We quantum-simulate the reheating-like dynamics of a generic cosmological single-field model in an ultracold Bose gas.
Expanding spacetime as well as the background oscillating inflaton field are mimicked in the non-relativistic limit.
The proposed experiment has the potential of exploring the evolution up to late times even beyond the weak coupling regime.
arXiv Detail & Related papers (2020-08-05T18:00:26Z)
This list is automatically generated from the titles and abstracts of the papers in this site.
This site does not guarantee the quality of this site (including all information) and is not responsible for any consequences.