Quantum sensing of temperature close to absolute zero in a Bose-Einstein condensate

• URL: http://arxiv.org/abs/2212.08237v1
• Date: Fri, 16 Dec 2022 02:10:20 GMT
• Title: Quantum sensing of temperature close to absolute zero in a Bose-Einstein condensate
• Abstract summary: We propose a theoretical scheme for quantum sensing of temperature close to absolute zero in a quasi-one-dimensional Bose-Einstein condensate (BEC) In our scheme, a single-atom impurity qubit is used as a temper-ature sensor. We demonstrate that the sensitivity of the temperature sensor can saturate the quantum Cramer-Rao bound by means of measuring quantum coherence of the probe qubit.
• Score: 3.272873540329058
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: We propose a theoretical scheme for quantum sensing of temperature close to absolute zero in a quasi-one-dimensional Bose-Einstein condensate (BEC). In our scheme, a single-atom impurity qubit is used as a temper-ature sensor. We investigate the sensitivity of the single-atom sensor in estimating the temperature of the BEC. We demonstrate that the sensitivity of the temperature sensor can saturate the quantum Cramer-Rao bound by means of measuring quantum coherence of the probe qubit. We study the temperature sensing performance by the use of quantum signal-to-noise ratio (QSNR). It is indicated that there is an optimal encoding time that the QSNR can reach its maximum in the full-temperature regime. In particular, we find that the QSNR reaches a finite upper bound in the weak coupling regime even when the temperature is close to absolute zero, which implies that the sensing-error-divergence problem is avoided in our scheme. Our work opens a way for quantum sensing of temperature close to absolute zero in the BEC.

Related papers

• Temperature encoding rates of two-level probes in de Sitter spacetime [1.3475585151968528]
  We quantify the temperature encoding rate, which characterizes the precision of estimating a temperature parameter with a fixed total probe time.<n>For a static probe separated by a finite distance from a freely falling observer, both the intrinsic Gibbons--Hawking temperature and the position-dependent Unruh temperature are encoded in the probe state.<n>We find that the required total probe time and the corresponding number of probes remain experimentally feasible when the dimensionless Unruh temperature approaches to $0.1$.
  arXiv  Detail & Related papers  (2026-08-16T08:07:16Z)
• Relativistic Quantum Thermometry in AdS Spacetime via Non-Markovian Temperature Sensing [0.0]
  We characterize the achievable accuracy using the Quantum Fisher Information (QFI) and the associated quantum signal-to-noise ratio.<n>For the first time, we introduce an ancillary Unruh-DeWitt detector between the sensor and the thermal bath, enhancing thermometric sensitivity.
  arXiv  Detail & Related papers  (2026-07-08T15:53:37Z)
• SYK thermal expectations are classically easy at any temperature [49.788604174558564]
  We give a simple classical algorithm that approximates thermal expectations.<n>We show it has quasi-polynomial cost $nO(log n/)$ for all temperatures above a phase transition in the free energy.
  arXiv  Detail & Related papers  (2026-02-26T04:48:32Z)
• Quantum thermometric sensing: Local vs. Remote approaches [0.8619139771027764]
  Quantum thermometry is investigated with an emphasis on fundamental precision bounds derived from quantum estimation theory.<n>The proposed sensing platform consists of two dissimilar qubits coupled via capacitor, which induce quantum oscillations in the presence of a thermal environment.
  arXiv  Detail & Related papers  (2025-10-18T19:56:09Z)
• Coherence-enhanced single-qubit thermometry out of equilibrium [0.0]
  We consider a finite-dimensional quantum system, employed as a quantum thermometer, in contact with a thermal inducing Markov bathian thermalization dynamics. We prove that the sensitivity of the thermometer, quantified by the quantum Fisher information, is enhanced by the quantum coherence in its initial state.
  arXiv  Detail & Related papers  (2024-05-23T11:11:01Z)
• 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)
• Erasure tolerant quantum memory and the quantum null energy condition in holographic systems [0.41998444721319217]
  Investigating principles for storage of quantum information at finite temperature with minimal need for active error correction is an active area of research. We study an explicit encoding of a logical qubit into two similar chirally propagating excitations of finite von-Neumann entropy on a finite temperature background. We show that the quantum null energy condition gives analytic results for the minimal finite temperature needed for the deletion.
  arXiv  Detail & Related papers  (2022-01-31T19:00:04Z)
• 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)
• Non-Markovian quantum thermometry [11.884385161872164]
  We propose non-Markovian quantum thermometry to measure the temperature of a quantum reservoir. It is found that it is the quantum criticality of the total thermometer-reservoir system that causes this enhanced sensitivity.
  arXiv  Detail & Related papers  (2021-09-06T09:39:08Z)
• 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)
• Reservoir engineering with arbitrary temperatures for spin systems and quantum thermal machine with maximum efficiency [50.591267188664666]
  Reservoir engineering is an important tool for quantum information science and quantum thermodynamics. We employ this technique to engineer reservoirs with arbitrary (effective) negative and positive temperatures for a single spin system.
  arXiv  Detail & Related papers  (2020-01-28T00:18:00Z)
• 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.