Time-reversal in a dipolar quantum many-body spin system

• URL: http://arxiv.org/abs/2402.13873v1
• Date: Wed, 21 Feb 2024 15:33:52 GMT
• Title: Time-reversal in a dipolar quantum many-body spin system
• Authors: Sebastian Geier, Adrian Braemer, Eduard Braun, Maximilian M\"ullenbach, Titus Franz, Martin G\"arttner, Gerhard Z\"urn, Matthias Weidem\"uller
• Abstract summary: Time reversal in a macroscopic system is contradicting daily experience. We implement a time-reversal protocol in a dipolar interacting, isolated many-body spin system represented by Rydberg states in an atomic gas. We demonstrate the reversal of the relaxation dynamics of the magnetization by letting a demagnetized many-body state evolve back-in-time into a magnetized state.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Time reversal in a macroscopic system is contradicting daily experience. It is practically impossible to restore a shattered cup to its original state by just time reversing the microscopic dynamics that led to its breakage. Yet, with the precise control capabilities provided by modern quantum technology, the unitary evolution of a quantum system can be reversed in time. Here, we implement a time-reversal protocol in a dipolar interacting, isolated many-body spin system represented by Rydberg states in an atomic gas. By changing the states encoding the spin, we flip the sign of the interaction Hamiltonian, and demonstrate the reversal of the relaxation dynamics of the magnetization by letting a demagnetized many-body state evolve back-in-time into a magnetized state. We elucidate the role of atomic motion using the concept of a Loschmidt echo. Finally, by combining the approach with Floquet engineering, we demonstrate time reversal for a large family of spin models with different symmetries. Our method of state transfer is applicable across a wide range of quantum simulation platforms and has applications far beyond quantum many-body physics, reaching from quantum-enhanced sensing to quantum information scrambling.

Related papers

• Quantum information scrambling in adiabatically-driven critical systems [49.1574468325115]
  Quantum information scrambling refers to the spread of the initially stored information over many degrees of freedom of a quantum many-body system. Here, we extend the notion of quantum information scrambling to critical quantum many-body systems undergoing an adiabatic evolution.
  arXiv  Detail & Related papers  (2024-08-05T18:00:05Z)
• Observation of many-body dynamical localization [12.36065516066796]
  We present evidence for many-body dynamical localization for the Lieb-Liniger version of the many-body quantum kicked rotor. Our results shed light on the boundary between the classical, chaotic world and the realm of quantum physics.
  arXiv  Detail & Related papers  (2023-12-21T14:24:50Z)
• Demonstrating Quantum Microscopic Reversibility Using Coherent States of Light [58.8645797643406]
  We propose and experimentally test a quantum generalization of the microscopic reversibility when a quantum system interacts with a heat bath. We verify that the quantum modification for the principle of microscopic reversibility is critical in the low-temperature limit.
  arXiv  Detail & Related papers  (2022-05-26T00:25:29Z)
• Quantum simulations of interacting systems with broken time-reversal symmetry [0.0]
  We realize quantum simulations of interacting, time-reversal broken quantum systems in a universal trapped-ion quantum processor. Our results open a path towards simulation of time-reversal broken many-body systems with a wide range of features and coupling geometries.
  arXiv  Detail & Related papers  (2022-05-23T10:29:34Z)
• Accelerating the approach of dissipative quantum spin systems towards stationarity through global spin rotations [0.0]
  We consider open quantum systems governed by a time-independent Markovian Lindblad Master equation. Such systems approach their stationary state on a timescale that is determined by the spectral gap of the generator of the Master equation dynamics. We show that even far simpler transformations constructed by a global unitary spin rotation allow to exponentially speed up relaxation.
  arXiv  Detail & Related papers  (2022-04-11T18:00:34Z)
• Proposal for a solid-state magnetoresistive Larmor quantum clock [0.0]
  We propose a solid-state implementation of the Larmor clock that exploits tunnel magnetoresistance. Our proposal takes into account the detrimental aspects of multiple reflections by incorporating multiple contacts. We unravel that while the time-keeping aspect of the Larmor clock is reasonably undeterred due to momentum and phase relaxation processes, it degrades significantly in the presence of spin-dephasing.
  arXiv  Detail & Related papers  (2021-12-04T04:59:37Z)
• Quantum control of nuclear spin qubits in a rapidly rotating diamond [62.997667081978825]
  Nuclear spins in certain solids couple weakly to their environment, making them attractive candidates for quantum information processing and inertial sensing. We demonstrate optical nuclear spin polarization and rapid quantum control of nuclear spins in a diamond physically rotating at $1,$kHz, faster than the nuclear spin coherence time. Our work liberates a previously inaccessible degree of freedom of the NV nuclear spin, unlocking new approaches to quantum control and rotation sensing.
  arXiv  Detail & Related papers  (2021-07-27T03:39:36Z)
• Imaginary Time Propagation on a Quantum Chip [50.591267188664666]
  Evolution in imaginary time is a prominent technique for finding the ground state of quantum many-body systems. We propose an algorithm to implement imaginary time propagation on a quantum computer.
  arXiv  Detail & Related papers  (2021-02-24T12:48:00Z)
• Information Scrambling in Computationally Complex Quantum Circuits [56.22772134614514]
  We experimentally investigate the dynamics of quantum scrambling on a 53-qubit quantum processor. We show that while operator spreading is captured by an efficient classical model, operator entanglement requires exponentially scaled computational resources to simulate.
  arXiv  Detail & Related papers  (2021-01-21T22:18:49Z)
• Jumptime unraveling of Markovian open quantum systems [68.8204255655161]
  We introduce jumptime unraveling as a distinct description of open quantum systems. quantum jump trajectories emerge, physically, from continuous quantum measurements. We demonstrate that quantum trajectories can also be ensemble-averaged at specific jump counts.
  arXiv  Detail & Related papers  (2020-01-24T09:35:32Z)
• Many-Body Dephasing in a Trapped-Ion Quantum Simulator [0.0]
  How a closed interacting quantum many-body system relaxes and dephases as a function of time is a fundamental question in thermodynamic and statistical physics. We analyse and observe the persistent temporal fluctuations after a quantum quench of a tunable long-range interacting transverse-field Ising Hamiltonian realized with a trapped-ion quantum simulator.
  arXiv  Detail & Related papers  (2020-01-08T12:33:28Z)

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.