Related papers: Critical quantum thermometry and its feasibility in spin systems

Critical quantum thermometry and its feasibility in spin systems

URL: http://arxiv.org/abs/2204.02734v2
Date: Sun, 11 Sep 2022 21:56:29 GMT
Title: Critical quantum thermometry and its feasibility in spin systems
Authors: Enes Aybar, Artur Niezgoda, Safoura S. Mirkhalaf, Morgan W. Mitchell, Daniel Benedicto Orenes, and Emilia Witkowska
Abstract summary: We use the quantum Fisher information (QFI) approach to quantify the sensitivity in the temperature estimation. We numerically calculate the QFI around the critical points for two experimentally-realizable systems.
Score: 0.0
License: http://creativecommons.org/licenses/by/4.0/
Abstract: In this work, we study temperature sensing with finite-sized strongly correlated systems exhibiting quantum phase transitions. We use the quantum Fisher information (QFI) approach to quantify the sensitivity in the temperature estimation, and apply a finite-size scaling framework to link this sensitivity to critical exponents of the system around critical points. We numerically calculate the QFI around the critical points for two experimentally-realizable systems: the spin-1 Bose-Einstein condensate and the spin-chain Heisenberg XX model in the presence of an external magnetic field. Our results confirm finite-size scaling properties of the QFI. Furthermore, we discuss experimentally-accessible observables that (nearly) saturate the QFI at the critical points for these two systems.

Related papers

Quantum sensing in Kerr parametric oscillators [0.0]
Changes in the ground state at a QPT enhance indicators of parameter estimation. In systems that lack a QPT, quantum sensitivity can still be enhanced due to excited-state quantum phase transitions.
arXiv Detail & Related papers (2024-07-19T18:00:00Z)
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)
Collisional thermometry for Gaussian systems [0.0]
We investigate a quantum thermometry scheme based collision model with Gaussian systems. A key open question of these schemes concerns the scaling of the Quantum Fisher Information (QFI) with the number of ancillae. Here we focus on Gaussian collision models, which allow for the scaling of the QFI to be evaluated for arbitrarily large sizes.
arXiv Detail & Related papers (2024-05-20T13:54:25Z)
Criticality-Enhanced Precision in Phase Thermometry [4.508246364123997]
We study non-invasive quantum thermometry of a finite, two-dimensional Ising spin lattice based on measuring the non-Markovian dephasing dynamics of a spin probe coupled to the lattice. We demonstrate a strong critical enhancement of the achievable precision in terms of the quantum Fisher information.
arXiv Detail & Related papers (2023-11-24T16:08:55Z)
Quantum Fisher Information for Different States and Processes in Quantum Chaotic Systems [77.34726150561087]
We compute the quantum Fisher information (QFI) for both an energy eigenstate and a thermal density matrix. We compare our results with earlier results for a local unitary transformation.
arXiv Detail & Related papers (2023-04-04T09:28:19Z)
Universality of critical dynamics with finite entanglement [68.8204255655161]
We study how low-energy dynamics of quantum systems near criticality are modified by finite entanglement. Our result establishes the precise role played by entanglement in time-dependent critical phenomena.
arXiv Detail & Related papers (2023-01-23T19:23:54Z)
Multipartite entanglement in the 1-D spin-$\frac{1}{2}$ Heisenberg Antiferromagnet [0.0]
Multipartite entanglement refers to the simultaneous entanglement between multiple subsystems of a quantum system. We show that the finite temperature QFI can generally be expressed in terms of a static structure factor of the system. We show that multipartite entanglement in the Heisenberg chain diverges non-trivially as $sim log (1/T)3/2$.
arXiv Detail & Related papers (2022-12-10T22:19:27Z)
Probing finite-temperature observables in quantum simulators of spin systems with short-time dynamics [62.997667081978825]
We show how finite-temperature observables can be obtained with an algorithm motivated from the Jarzynski equality. We show that a finite temperature phase transition in the long-range transverse field Ising model can be characterized in trapped ion quantum simulators.
arXiv Detail & Related papers (2022-06-03T18:00:02Z)
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)
Spectroscopy and critical quantum thermometry in the ultrastrong coupling regime [0.0]
We show that depending on the initial state of the coupled system, the vacuum Rabi splitting manifests significant asymmetries. We obtain the ultimate bounds on the estimation of temperature that remain valid in the ultrastrong coupling regime.
arXiv Detail & Related papers (2020-09-04T03:29:05Z)
In and out of equilibrium quantum metrology with mean-field quantum criticality [68.8204255655161]
We study the influence that collective transition phenomena have on quantum metrological protocols. The single spherical quantum spin (SQS) serves as stereotypical toy model that allows analytical insights on a mean-field level.
arXiv Detail & Related papers (2020-01-09T19:20:42Z)

This list is automatically generated from the titles and abstracts of the papers in this site.