Relativistic Quantum Thermometry in AdS Spacetime via Non-Markovian Temperature Sensing

• URL: http://arxiv.org/abs/2607.07562v1
• Date: Wed, 08 Jul 2026 15:53:37 GMT
• Title: Relativistic Quantum Thermometry in AdS Spacetime via Non-Markovian Temperature Sensing
• Abstract summary: 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.
• Score: 0.0
• License: http://creativecommons.org/publicdomain/zero/1.0/
• Abstract: Quantum thermometry based on single-qubit sensor configurations enables the precise estimation of the temperature of a cosmological Anti-de Sitter (AdS) spacetime. In this work, we characterize the achievable estimation accuracy using the Quantum Fisher Information (QFI) and the associated quantum signal-to-noise ratio. For the first time, we introduce an ancillary Unruh-DeWitt detector between the sensor and the thermal bath, enhancing thermometric sensitivity by channeling temperature-dependent information into the probe qubit's coherence. We examine how detector acceleration in AdS space and the choice of boundary conditions modify the probe's thermal sensitivity. Despite the differing geometries, a unified phenomenology emerges: we characterize the scaling of the QFI with respect to temperature, detector energy gap, spacetime curvature, and interaction time. Finally, we identify optimal state preparation and measurement strategies that maximize the QFI, thereby establishing the fundamental limits of precision for non-Markovian sensing in curved spacetime.

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)
• 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)
• Temperature-induced measurement sensitivity enhancement via imaginary weak values [41.99844472131922]
  We investigate the potential of weak measurement and post-selection to enhance measurement sensitivity when the initial probe state is mixed.<n>We focus on two key quantities: the signal-to-noise ratio and the quantum Fisher information of the final probe state.
  arXiv  Detail & Related papers  (2025-09-04T09:28:44Z)
• Exact analysis of AC sensors based on Floquet time crystals [41.99844472131922]
  We discuss the behavior of general Floquet Time Crystals (FTCs) in closed systems acting as AC sensors.<n>We show how to induce transitions resonantly between macroscopic paired cat states in the FTC sensor.
  arXiv  Detail & Related papers  (2025-05-28T18:00:05Z)
• 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)
• Information Entropy Initialized Concrete Autoencoder for Optimal Sensor Placement and Reconstruction of Geophysical Fields [58.720142291102135]
  We propose a new approach to the optimal placement of sensors for reconstructing geophysical fields from sparse measurements. We demonstrate our method on the two examples: (a) temperature and (b) salinity fields around the Barents Sea and the Svalbard group of islands. We find out that the obtained optimal sensor locations have clear physical interpretation and correspond to the boundaries between sea currents.
  arXiv  Detail & Related papers  (2022-06-28T12:43:38Z)
• 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)
• 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)
• 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)
• Fisher information as a probe of spacetime structure: Relativistic quantum metrology in (A)dS [0.0]
  We study the relativistic quantum metrology of temperature in (3+1)-dimensional de Sitter and anti-de Sitter space. Using Unruh-DeWitt detectors coupled to a massless scalar field as probes, we compute the Fisher information for estimating temperature. We find that the phenomenology of the Fisher information in the two spacetimes can be unified, and analyze its dependence on temperature, detector energy gap, curvature, interaction time, and detector initial state.
  arXiv  Detail & Related papers  (2020-12-15T19:08:18Z)
• 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.