Quantum thermometry for ultralow temperatures using probe and ancilla qubit chains

• URL: http://arxiv.org/abs/2412.14898v2
• Date: Tue, 18 Feb 2025 17:29:34 GMT
• Title: Quantum thermometry for ultralow temperatures using probe and ancilla qubit chains
• Authors: Asghar Ullah, Vipul Upadhyay, Özgür E. Müstecaplıoğlu,
• Abstract summary: We propose a scheme to enhance the range and precision of ultralow temperature measurements by employing a probe qubit coupled to a chain of ancilla qubits. This study highlights the potential of the probe qubit-ancilla chain system as a powerful and precise tool for quantum thermometry in the ultralow temperature regime.
• Score: 0.0
• License:
• Abstract: We propose a scheme to enhance the range and precision of ultralow temperature measurements by employing a probe qubit coupled to a chain of ancilla qubits. Specifically, we analyze a qubit chain governed by Heisenberg $XX$ and Dzyaloshinskii-Moriya (DM) interactions. The precision limits of temperature measurements are characterized through the evaluation of quantum Fisher information (QFI). Our findings demonstrate that the achievable precision bounds, as well as the number of peaks in the QFI as a function of temperature, can be controlled by adjusting the number of ancilla qubits and the system's model parameters. These results are interpreted in terms of the influence of energy transitions on the range and the number of QFI peaks as a function of temperature. This study highlights the potential of the probe qubit-ancilla chain system as a powerful and precise tool for quantum thermometry in the ultralow temperature regime.

Related papers

• Enhancing low-temperature quantum thermometry via sequential measurements [14.060887953591399]
  We propose a sequential measurement protocol for accurate low-temperature estimation. The resulting correlated outputs significantly enhance the low temperature precision. We find that quantum thermometry within the sequential protocol functions as a high-resolution quantum spectroscopy of the thermal noise.
  arXiv  Detail & Related papers  (2024-12-06T09:20:01Z)
• Harnessing coherence generation for precision single- and two-qubit quantum thermometry [0.0]
  Investigation assesses the precision of temperature estimate using quantum Fisher information and the accompanying quantum signal-to-noise ratio. We analyze two interacting qubits that were initially entangled or separated as quantum probes for various environmental configurations.
  arXiv  Detail & Related papers  (2024-11-08T20:25:45Z)
• On the Measurement of the Unruh Effect Through Extended Quantum Thermometers [0.0]
  The Unruh effect, predicting a thermal reservoir for accelerating systems, calls for a more refined understanding of measurement processes involving quantum systems as thermometers. We propose a refined thermometer model incorporating a spin-1/2 particle where the spin acts as a temperature indicator.
  arXiv  Detail & Related papers  (2024-06-13T12:51:45Z)
• Low-temperature quantum thermometry boosted by coherence generation [0.0]
  We present a method for low-temperature measurement that improves thermal range and sensitivity by generating quantum coherence in a thermometer probe. We use a two-level quantum system, or qubit, as our probe and prevent direct probe access to the sample by introducing a set of ancilla qubits as an interface.
  arXiv  Detail & Related papers  (2022-11-10T10:12:58Z)
• 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)
• Criticality-enhanced quantum sensor at finite temperature [44.23814225750129]
  We propose a thermodynamic-criticality-enhanced quantum sensing scenario at finite temperature. It is revealed that the thermodynamic criticality of the Dicke model can significantly improve the sensing precision.
  arXiv  Detail & Related papers  (2021-10-15T02:39:31Z)
• Measurement of the Low-temperature Loss Tangent of High-resistivity Silicon with a High Q-factor Superconducting Resonator [58.720142291102135]
  We present the direct loss tangent measurement of a high-resist intrinsicivity (100) silicon wafer in the temperature range from 70 mK to 1 K. The measurement was performed using a technique that takes advantage of a high quality factor superconducting niobium resonator.
  arXiv  Detail & Related papers  (2021-08-19T20:13:07Z)
• Role of topology in determining the precision of a finite thermometer [58.720142291102135]
  We find that low connectivity is a resource to build precise thermometers working at low temperatures. We compare the precision achievable by position measurement to the optimal one, which itself corresponds to energy measurement.
  arXiv  Detail & Related papers  (2021-04-21T17:19:42Z)
• 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)
• Adiabatic Sensing Technique for Optimal Temperature Estimation using Trapped Ions [64.31011847952006]
  We propose an adiabatic method for optimal phonon temperature estimation using trapped ions. The relevant information of the phonon thermal distributions can be transferred to the collective spin-degree of freedom. We show that each of the thermal state probabilities is adiabatically mapped onto the respective collective spin-excitation configuration.
  arXiv  Detail & Related papers  (2020-12-16T12:58:08Z)
• Tight bound on finite-resolution quantum thermometry at low temperatures [0.0]
  We investigate fundamental precision limits for thermometry on cold quantum systems. We derive a tight bound on the optimal precision scaling with temperature, as the temperature approaches zero.
  arXiv  Detail & Related papers  (2020-01-13T08:13:42Z)

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.