Improving the estimation of environment parameters via initial probe-environment correlations

• URL: http://arxiv.org/abs/2011.08836v2
• Date: Thu, 31 Dec 2020 11:15:22 GMT
• Title: Improving the estimation of environment parameters via initial probe-environment correlations
• Authors: Hamza Ather and Adam Zaman Chaudhry
• Abstract summary: Small, controllable quantum systems, known as quantum probes, have been proposed to estimate various parameters characterizing complex systems. We show that information about the environment is also imprinted on the probe via the probe and environment correlations that exist before the probe state preparation.
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Small, controllable quantum systems, known as quantum probes, have been proposed to estimate various parameters characterizing complex systems such as the environments of quantum systems. These probes, prepared in some initial state, are allowed to interact with their environment, and subsequent measurements reveal information about different quantities characterizing the environment such as the system-environment coupling strength, the cutoff frequency, and the temperature. These estimates have generally been made by considering only the way that the probe undergoes decoherence. However, we show that information about the environment is also imprinted on the probe via the probe and environment correlations that exist before the probe state preparation. This information can then be used to improve our estimates for any environment. We apply this general result to the particular case of a two-level system probe undergoing pure dephasing, due to a harmonic oscillator environment, to show that a drastic increase in the quantum Fisher information, and hence the precision of our estimates, can indeed be obtained. We also consider applying periodic control pulses to the probe to show that with a combination of the two - the effect of the control pulses as well as the initial correlations - the quantum Fisher information can be increased by orders of magnitude.

Related papers

• The role of initial system-environment correlations in the accuracies of parameters within spin-spin model [0.0]
  We investigate the effect of initial system-environment correlations to improve the estimation of environment parameters. In the temperature estimation case, our results are promising as one can improve the precision of the estimates by orders of magnitude. In the case of coupling strength, interestingly the accuracy was found to be continuously increasing in both with and without correlations cases.
  arXiv  Detail & Related papers  (2024-07-04T02:25:51Z)
• Open quantum system in the indefinite environment [13.979213066536394]
  In this paper, we investigate the interference engineering of the open quantum system. The environment is made indefinite either through the use of an interferometer or the introduction of auxiliary qubits.
  arXiv  Detail & Related papers  (2023-07-13T07:52:48Z)
• Evolution of many-body systems under ancilla quantum measurements [58.720142291102135]
  We study the concept of implementing quantum measurements by coupling a many-body lattice system to an ancillary degree of freedom. We find evidence of a disentangling-entangling measurement-induced transition as was previously observed in more abstract models.
  arXiv  Detail & Related papers  (2023-03-13T13:06:40Z)
• 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)
• Tunneling Gravimetry [58.80169804428422]
  We examine the prospects of utilizing matter-wave Fabry-P'erot interferometers for enhanced inertial sensing applications. Our study explores such tunneling-based sensors for the measurement of accelerations in two configurations.
  arXiv  Detail & Related papers  (2022-05-19T09:22:11Z)
• Neural-Network Quantum States for Periodic Systems in Continuous Space [66.03977113919439]
  We introduce a family of neural quantum states for the simulation of strongly interacting systems in the presence of periodicity. For one-dimensional systems we find very precise estimations of the ground-state energies and the radial distribution functions of the particles. In two dimensions we obtain good estimations of the ground-state energies, comparable to results obtained from more conventional methods.
  arXiv  Detail & Related papers  (2021-12-22T15:27:30Z)
• Quantum metrology with one auxiliary particle in a correlated bath and its quantum simulation [1.0118253437732931]
  The precision of parameter estimation with entangled probes is even lower than that of the unentangled ones in a correlated environment. We propose a measurement scheme with only one auxiliary qubit, which can selectively offset the impact of environmental noise.
  arXiv  Detail & Related papers  (2021-05-21T10:24:36Z)
• Intrinsic and induced quantum quenches for enhancing qubit-based quantum noise spectroscopy [17.927258551700596]
  We discuss how standard $T$-based quantum sensing and noise spectroscopy protocols often give rise to an inadvertent quench of the system or environment being probed. We show how these new features can be used to directly access environmental response properties.
  arXiv  Detail & Related papers  (2021-04-05T17:52:31Z)
• Tracing Information Flow from Open Quantum Systems [52.77024349608834]
  We use photons in a waveguide array to implement a quantum simulation of the coupling of a qubit with a low-dimensional discrete environment. Using the trace distance between quantum states as a measure of information, we analyze different types of information transfer.
  arXiv  Detail & Related papers  (2021-03-22T16:38:31Z)
• Quantum probing beyond pure dephasing [0.0]
  We analyze the performance of a single-qubit probe in characterizing Ohmic bosonic environments at thermal equilibrium. In particular, we analyze the effects of tuning the interaction Hamiltonian between the probe and the environment.
  arXiv  Detail & Related papers  (2020-03-09T10:06:39Z)
• Quantum probes for universal gravity corrections [62.997667081978825]
  We review the concept of minimum length and show how it induces a perturbative term appearing in the Hamiltonian of any quantum system. We evaluate the Quantum Fisher Information in order to find the ultimate bounds to the precision of any estimation procedure. Our results show that quantum probes are convenient resources, providing potential enhancement in precision.
  arXiv  Detail & Related papers  (2020-02-13T19:35:07Z)

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.