Position-Momenta Uncertainties in Classical Systems
- URL: http://arxiv.org/abs/2503.24122v1
- Date: Mon, 31 Mar 2025 14:08:41 GMT
- Title: Position-Momenta Uncertainties in Classical Systems
- Abstract summary: We show that classical particles immersed in such baths exhibit position-momentum uncertainties.<n>The proportionality constant, $c$, is dimensionless and independent of the system's parameters.
- Score: 0.6445605125467574
- License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
- Abstract: We design a thermal bath that preserves the conservation of a system's angular momentum or allows it to fluctuate around a specified nonzero mean while maintaining a Boltzmann distribution of energy in the steady state.We demonstrate that classical particles immersed in such baths exhibit position-momentum uncertainties with a strictly positive lower bound proportional to the absolute value of the mean angular momentum. The proportionality constant, $c$, is dimensionless and independent of the system's parameters. Remarkably, while $c$ is universally bounded by unity, it attains the exact value $c=1/2$ for particles in central potentials.
Related papers
- When Isolated Quantum Systems Appear Classical [35.18016233072556]
We show that classical behavior may emerge even when substantial coherence remains present in the equilibrium state.<n>This establishes a direct connection between two foundational questions: the origin of thermalization in isolated quantum systems and the quantum-to-classical transition.
arXiv Detail & Related papers (2026-06-17T15:30:00Z) - Quantum optomechanics of lossy bodies: general approach and structured squeezed vacuum effects [51.56484100374058]
We investigate the overall optomechanical force experienced by a macroscopic lossy object in free space under external quantum illumination.<n>By driving the scattering field with an anisotropic, multimode squeezed vacuum state, the spatial profile of the electromagnetic quantum fluctuations can be engineered to exhibit broken rotational symmetry.<n>We establish a general formalism for macroscopic quantum optomechanics that operates beyond the constraints of thermal equilibrium.
arXiv Detail & Related papers (2026-04-07T13:25:43Z) - Average Equilibration Time for Gaussian Unitary Ensemble Hamiltonians [35.18016233072556]
We study equilibration times in closed quantum systems using the framework of equilibration as dephasing.<n>We find that the equilibration time decreases with system size and timescales in the thermodynamic limit.<n>This unphysical result indicates that the true equilibration timescale of realistic chaotic many-body systems must be dominated by physical features not captured by random matrix ensembles.
arXiv Detail & Related papers (2026-03-30T15:35:04Z) - Freeness Reined in by a Single Qubit [36.94429692322632]
We find that, even in this setting, the correlation functions predicted by free probability theory receive corrections of order $O(1)$.<n>We trace their origin to non-uniformly distributed stationary quantum states, which we characterize analytically and confirm numerically.
arXiv Detail & Related papers (2025-12-15T19:00:09Z) - Uniform relativistic motion through a thermal bath as a thermodynamic resource [0.0]
We show that a quantum system undergoing motion with uniform relativistic velocity is driven into a non-equilibrium steady-state (NESS) solely due to its motion.<n>We find that the resulting steady-states fall into two distinct classes: (i) NESSs with persistent probability currents, and (ii) current-free non-Gibbs steady states characterized by a frequency-dependent effective inverse temperature.
arXiv Detail & Related papers (2025-12-08T13:59:48Z) - Nontrivial local observables and impermeable and permeable boundary conditions for 1D KFGM particles [0.0]
Real solutions of the 1D Klein-Fock-Gordon (KFG) equation automatically cancel out the usual two-vector current density.<n>We show that an energy current density can characterize all available confining and nonconfining boundary conditions.
arXiv Detail & Related papers (2025-07-23T05:46:08Z) - Symmetries, Conservation Laws and Entanglement in Non-Hermitian Fermionic Lattices [37.69303106863453]
Non-Hermitian quantum many-body systems feature steady-state entanglement transitions driven by unitary dynamics and dissipation.
We show that the steady state is obtained by filling single-particle right eigenstates with the largest imaginary part of the eigenvalue.
We illustrate these principles in the Hatano-Nelson model with periodic boundary conditions and the non-Hermitian Su-Schrieffer-Heeger model.
arXiv Detail & Related papers (2025-04-11T14:06:05Z) - Dynamical freezing in the thermodynamic limit: the strongly driven ensemble [37.31317754926534]
A periodically driven (Floquet) system in the absence of any conservation law heats to a featureless infinite temperature' state.
Here, we find--for a clean and interacting generic spin chain--that this can be prevented by the emergence of it approximate but stable conservation-laws not present in the undriven system.
We show numerically, it in the thermodynamic limit,' that when required by these emergent conservation-laws, the entanglement-entropy density of an infinite subsystem remains zero.
arXiv Detail & Related papers (2024-10-14T19:57:43Z) - Stability of Quantum Systems beyond Canonical Typicality [9.632520418947305]
We analyze the statistical distribution of a quantum system coupled strongly with a heat bath.
The stability of system distribution is largely affected by the system--bath interaction strength.
arXiv Detail & Related papers (2024-07-22T02:59:04Z) - Quantum many-body spin ratchets [0.0]
We show that breaking of space-reflection symmetry results in a drift in the dynamical spin susceptibility.
We also show that the scaled cumulant generating function of the time-integrated current instead obeys a generalized fluctuation relation.
arXiv Detail & Related papers (2024-06-03T17:51:36Z) - Chaos and quantization of the three-particle generic
Fermi-Pasta-Ulam-Tsingou model II: phenomenology of quantum eigenstates [5.387047563972287]
We study the phenomenology of quantum eigenstates in the three-particle FPUT model.
We find that in the mixed-type system, the fraction of mixed eigenstates in an energy shell shows a power-law decay with respect to the decreasing Planck constant.
In the general case which is fully chaotic, the maximally localized state is influenced by the stable and unstable manifold of the saddles.
arXiv Detail & Related papers (2024-01-23T19:51:58Z) - Entanglement and localization in long-range quadratic Lindbladians [49.1574468325115]
Signatures of localization have been observed in condensed matter and cold atomic systems.
We propose a model of one-dimensional chain of non-interacting, spinless fermions coupled to a local ensemble of baths.
We show that the steady state of the system undergoes a localization entanglement phase transition by tuning $p$ which remains stable in the presence of coherent hopping.
arXiv Detail & Related papers (2023-03-13T12:45:25Z) - Partition of kinetic energy and magnetic moment in dissipative
diamagnetism [20.218184785285132]
We analyze dissipative diamagnetism, arising due to dissipative cyclotron motion in two dimensions, in the light of the quantum counterpart of energy equipartition theorem.
The expressions for kinetic energy and magnetic moment are reformulated in the context of superstatistics.
arXiv Detail & Related papers (2022-07-30T08:07:28Z) - Effect of Wigner rotation on estimating unitary-shift parameter of
relativistic spin-1/2 particle [21.22196305592545]
We use a specific model of a relativistic spin-1/2 particle described by a gaussian wave function with a spin down in the rest frame.
It is shown that estimation accuracy decreases monotonically in the velocity of the observer when the moving observer does not measure the spin degree of freedom.
arXiv Detail & Related papers (2022-04-21T20:26:45Z) - Scalable spin squeezing from spontaneous breaking of a continuous
symmetry [0.0]
In systems of $S=1/2$ or qubits, the combination of the suppression of fluctuations along one direction and of the persistence of transverse magnetization leads to spin squeezing.
Our findings open the door to the adiabatic preparation of strongly spin-squeezed states in a large variety of quantum many-body devices including e.g. optical lattice clocks.
arXiv Detail & Related papers (2022-02-17T11:41:30Z) - Turbulent relaxation to equilibrium in a two-dimensional quantum vortex
gas [0.0]
We experimentally study emergence of microcanonical equilibrium states in the turbulent relaxation dynamics of a two-dimensional chiral vortex gas.
Same-sign vortices are injected into a quasi-two-dimensional disk-shaped atomic Bose-Einstein condensate using a range of mechanical stirring protocols.
arXiv Detail & Related papers (2020-10-20T06:05:01Z) - Density dynamics in the mass-imbalanced Hubbard chain [0.0]
We consider two mutually interacting fermionic particle species on a one-dimensional lattice.
We study how the mass ratio $eta$ between the two species affects the dynamics of the particles.
arXiv Detail & Related papers (2020-04-28T15:38:02Z) - Growth of mutual information in a quenched one-dimensional open quantum
many body system [11.731315568079445]
In a dissipative system, postquench information propagates solely through entangled pairs of quasiparticles having a finite lifetime.
Remarkably, in spite of the finite lifetime of the quasiparticles, a finite steady-state value of the MI survives in times which is an artifact of nonvanishing two-point correlations.
arXiv Detail & Related papers (2020-01-27T14:08:39Z)
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.