Real space thermalization of locally driven quantum magnets

• URL: http://arxiv.org/abs/2212.13790v2
• Date: Thu, 26 Sep 2024 19:18:52 GMT
• Title: Real space thermalization of locally driven quantum magnets
• Authors: Ronald Melendrez, Bhaskar Mukherjee, Prakash Sharma, Arijeet Pal, Hitesh J. Changlani,
• Abstract summary: Motivated by these advances, we propose experimentally accessible, local, time-dependent protocols to explore the spatial thermalization profile. We identify distinct parametric regimes for the ferromagnetic ($X$-polarized) initial state based on the interplay between the driven spin and the rest. We develop a real and Floquet space picture that explains our numerical observations, and make predictions that can be tested in various experimental setups.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: The study of thermalization and its breakdown in isolated systems has led to a deeper understanding of non-equilibrium quantum states and their dependence on initial conditions. The role of initial conditions is prominently highlighted by the existence of quantum many-body scars, special athermal states with an underlying effective superspin structure, embedded in an otherwise chaotic many-body spectrum. Spin Heisenberg and $XXZ$ models and their variants in one and higher dimension have been shown to host exact quantum many-body scars, exhibiting perfect revivals of spin helix states that are realizable in synthetic and condensed matter systems. Motivated by these advances, we propose experimentally accessible, local, time-dependent protocols to explore the spatial thermalization profile and highlight how different parts of the system thermalize and affect the fate of the superspin. We identify distinct parametric regimes for the ferromagnetic ($X$-polarized) initial state based on the interplay between the driven spin and the rest, including local athermal behavior where the driven spin effectively decouples, acting like a ``cold" spot while being instrumental in heating up the other spins. We also identify parameter regimes where the superspin remains resilient to local driving for long time scales. We develop a real and Floquet space picture that explains our numerical observations, and make predictions that can be tested in various experimental setups.

Related papers

• Thermalization and Criticality on an Analog-Digital Quantum Simulator [133.58336306417294]
  We present a quantum simulator comprising 69 superconducting qubits which supports both universal quantum gates and high-fidelity analog evolution. We observe signatures of the classical Kosterlitz-Thouless phase transition, as well as strong deviations from Kibble-Zurek scaling predictions. We digitally prepare the system in pairwise-entangled dimer states and image the transport of energy and vorticity during thermalization.
  arXiv  Detail & Related papers  (2024-05-27T17:40:39Z)
• Controlling local thermalization dynamics in a Floquet-engineered dipolar ensemble [0.7437459197111806]
  We show a method to probe local thermalization in a large-scale many-body system by exploiting its inherent disorder. We observe a striking change in the characteristic shape and timescale of local correlation decay as we vary the engineered exchange anisotropy. Our method provides an exquisite lens into the tunable nature of local thermalization dynamics.
  arXiv  Detail & Related papers  (2022-09-19T18:45:04Z)
• Emergent pair localization in a many-body quantum spin system [0.0]
  Generically, non-integrable quantum systems are expected to thermalize as they comply with the Eigenstate Thermalization Hypothesis. In the presence of strong disorder, the dynamics can possibly slow down to a degree that systems fail to thermalize on experimentally accessible timescales. We study an ensemble of Heisenberg spins with a tunable distribution of random coupling strengths realized by a Rydberg quantum simulator.
  arXiv  Detail & Related papers  (2022-07-28T16:31:18Z)
• Condensation and thermalization of an easy-plane ferromagnet in a spinor Bose gas [0.0]
  We study the thermalization of an easy-plane ferromagnet employing a homogeneous one-dimensional spinor Bose gas. We reveal the structure of the emergent quasi-particles: one'massive'(Higgs) mode, and two'massless' (Goldstone) modes.
  arXiv  Detail & Related papers  (2022-05-12T16:18:49Z)
• Accessing the topological Mott insulator in cold atom quantum simulators with realistic Rydberg dressing [58.720142291102135]
  We investigate a realistic scenario for the quantum simulation of such systems using cold Rydberg-dressed atoms in optical lattices. We perform a detailed analysis of the phase diagram at half- and incommensurate fillings, in the mean-field approximation. We furthermore study the stability of the phases with respect to temperature within the mean-field approximation.
  arXiv  Detail & Related papers  (2022-03-28T14:55:28Z)
• 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)
• Single-particle localization in a two-dimensional Rydberg spin system [0.0]
  We study excitation transport in a two-dimensional system of randomly assembled spins with power-law hopping in two dimensions. Due to the Rydberg blockade effect, the degree of disorder in the system is effectively tunable by varying the spin density.
  arXiv  Detail & Related papers  (2021-06-04T13:28:51Z)
• Visualizing spinon Fermi surfaces with time-dependent spectroscopy [62.997667081978825]
  We propose applying time-dependent photo-emission spectroscopy, an established tool in solid state systems, in cold atom quantum simulators. We show in exact diagonalization simulations of the one-dimensional $t-J$ model that the spinons start to populate previously unoccupied states in an effective band structure. The dependence of the spectral function on the time after the pump pulse reveals collective interactions among spinons.
  arXiv  Detail & Related papers  (2021-05-27T18:00:02Z)
• Taking the temperature of a pure quantum state [55.41644538483948]
  Temperature is a deceptively simple concept that still raises deep questions at the forefront of quantum physics research. We propose a scheme to measure the temperature of such pure states through quantum interference.
  arXiv  Detail & Related papers  (2021-03-30T18:18:37Z)
• Efficient entanglement of spin qubits mediated by a hot mechanical oscillator [0.0]
  Localized electronic and nuclear spin qubits in the solid state constitute a promising platform for storage and manipulation of quantum information. We propose and analyze a scheme that employs a parity measurement in a decoherence free subspace to enable fast and robust entanglement generation. We find that high-fidelity entanglement at cryogenic and even ambient temperatures is feasible with realistic parameters, and show that the entangled pair can be subsequently leveraged for deterministic controlled-NOT operations.
  arXiv  Detail & Related papers  (2020-11-05T02:30:18Z)
• The limit of spin lifetime in solid-state electronic spins [77.34726150561087]
  We provide a complete first-principles picture of spin relaxation that includes up to two-phonon processes. We study a vanadium-based molecular qubit and reveal that the spin lifetime at high temperature is limited by Raman processes.
  arXiv  Detail & Related papers  (2020-04-08T14:27:36Z)

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.