Achieving spin-squeezed states by quench dynamics in a quantum chain
- URL: http://arxiv.org/abs/2108.13805v2
- Date: Thu, 16 Dec 2021 09:47:47 GMT
- Title: Achieving spin-squeezed states by quench dynamics in a quantum chain
- Authors: Hadi Cheraghi, Saeed Mahdavifar, Henrik Johannesson
- Abstract summary: We study the time evolution of spin squeezing in the one-dimensional spin-1/2 XY model subject to a sudden quantum quench of a transverse magnetic field.
Our analysis, based on exact results for the model, reveals that by a proper choice of protocol, a quantum quench from an unsqueezed state can create spin squeezed nonequilibrium states.
- Score: 0.0
- License: http://creativecommons.org/publicdomain/zero/1.0/
- Abstract: We study the time evolution of spin squeezing in the one-dimensional spin-1/2
XY model subject to a sudden quantum quench of a transverse magnetic field. The
initial state is selected from the ground state phase diagram of the model,
consisting of ferro- and paramagnetic phases separated by a critical value of
the transverse field. Our analysis, based on exact results for the model,
reveals that by a proper choice of protocol, a quantum quench from an
unsqueezed state can create spin squeezed nonequilibrium states. We also
identify a nonanalyticity in the long-time average of the spin-squeezing
parameter when quenching to the equilibrium quantum critical point. This
suggests that the ferro- and paramagnetic phases also define distinct phases
for how the transverse field redistributes quantum fluctuations among the spin
components away from equilibrium.
Related papers
- 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) - Scalable spin squeezing in two-dimensional arrays of dipolar large-$S$
spins [0.0]
We show that spin-spin interactions lead to scalable spin squeezing along the non-equilibrium unitary evolution in a coherent spin state.
For sufficiently small quadratic shifts, the spin squeezing dynamics is akin to that produced by the paradigmatic one-axis-twisting (OAT) model.
Spin squeezing with OAT-like scaling is shown to be protected by the robustness of long-range ferromagnetic order to quadratic shifts.
arXiv Detail & Related papers (2023-09-11T10:32:24Z) - Quantum Effects on the Synchronization Dynamics of the Kuramoto Model [62.997667081978825]
We show that quantum fluctuations hinder the emergence of synchronization, albeit not entirely suppressing it.
We derive an analytical expression for the critical coupling, highlighting its dependence on the model parameters.
arXiv Detail & Related papers (2023-06-16T16:41:16Z) - 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) - Predicting Critical Phases from Entanglement Dynamics in XXZ Alternating
Chain [0.0]
The quantum XXZ spin model with alternating bond strengths under magnetic field has a rich equilibrium phase diagram.
We show that the nearest neighbor bipartite and multipartite entanglement can detect quantum critical lines and phases in this model.
arXiv Detail & Related papers (2021-12-22T18:02:51Z) - Entanglement Transitions from Stochastic Resetting of Non-Hermitian
Quasiparticles [0.0]
We write down a renewal equation for the statistics of the entanglement entropy and show that depending on the spectrum of quasiparticle decay rates different entanglement scaling can arise and even sharp entanglement phase transitions.
When applied to a Quantum Ising chain where the transverse magnetization is measured by quantum jumps, our theory predicts a critical phase with logarithmic scaling of the entanglement, an area law phase and a continuous phase transition between them, with an effective central charge vanishing as a square root at the transition point.
arXiv Detail & Related papers (2021-11-05T13:38:04Z) - Localization transition induced by programmable disorder [0.24629531282150877]
Many-body localization occurs on a spin-1/2 transverse-field Ising model.
We observe a transition from an ergodic phase to a non-thermal phase for individual energy eigenstates.
We realize the time-independent disordered Ising Hamiltonian experimentally on a D-Wave 2000Q programmable quantum annealer.
arXiv Detail & Related papers (2021-08-15T15:37:32Z) - Phase diagram of a distorted kagome antiferromagnet and application to
Y-kapellasite [50.591267188664666]
We reveal a rich ground state phase diagram even at the classical level.
The presented model opens a new direction in the study of kagome antiferromagnets.
arXiv Detail & Related papers (2021-07-28T18:00:03Z) - Superradiant phase transition in complex networks [62.997667081978825]
We consider a superradiant phase transition problem for the Dicke-Ising model.
We examine regular, random, and scale-free network structures.
arXiv Detail & Related papers (2020-12-05T17:40:53Z) - Nonequilibrium phases and phase transitions of the XY-model [0.9290757451344674]
We characterize the different non-equilibrium phases as functions of the chain's parameters and magnetic potentials.
Results should prove helpful in establishing the properties of non-equilibrium phases and phase transitions of extended open quantum systems.
arXiv Detail & Related papers (2020-09-15T02:58:50Z)
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.