Nonequilibrium quantum thermometry with noncommutative system-bath couplings
arXiv:2512.19607 · doi:10.1103/prs2-jcxj
Abstract
Accurate temperature estimation in the quantum and cryogenic regimes remains a fundamental challenge. Here, we investigate nonequilibrium quantum thermometry using a single-qubit probe coupled to a bosonic bath through noncommuting interaction operators, which unify pure dephasing and dissipative dynamics within a spin-boson model. We show that the interference between these two coupling channels induces strong non-Markovian feedback between populations and coherences, leading to coherence trapping and enhanced thermal sensitivity. Remarkably, by tuning the coupling structure, the probe's temperature sensitivity exhibits a quadratic low-temperature scaling, even under weak coupling. Moreover, while coherence-based measurements are formally suboptimal, they become the most informative in the early nonequilibrium regime, where memory effects dominate. Our findings identify noncommutative system-bath couplings as a practical and tunable resource for achieving high-precision quantum thermometry in realistic open-system architectures.
9 pages, 3 figures
References in corpus (50)
- Quantum Coherence as a Resource
- Measure for the Degree of Non-Markovian Behavior of Quantum Processes in Open Systems
- Fundamental limitations for quantum and nano thermodynamics
- The second laws of quantum thermodynamics
- Assessing non-Markovian dynamics
- Thermometry in the quantum regime: Recent theoretical progress
- Quantum Limits of Thermometry
- Single-qubit thermometry
- In situ thermometry of a cold Fermi gas via dephasing impurities
- Using polarons for sub-nK quantum non-demolition thermometry in a Bose-Einstein condensate
- Collisional quantum thermometry
- Local quantum thermal susceptibility
- Low-temperature thermometry can be enhanced by strong coupling
- Coherence trapping and information back-flow in dephasing qubits
- Nakajima-Zwanzig versus time-convolutionless master equation for the non-Markovian dynamics of a two-level system
- Scaling of genuine multiparticle entanglement at a quantum phase transition
- Quantum thermometry by single-qubit dephasing
- Probing the temperature of cold many-body quantum systems
- Delineating incoherent non-Markovian dynamics using quantum coherence
- Fundamental limits on low-temperature quantum thermometry with finite resolution
- Achieving the Landau bound to precision of quantum thermometry in systems with vanishing gap
- Two-qubit quantum probes for the temperature of an Ohmic environment
- Estimating Temperature via Sequential Measurements
- Enhanced precision bound of low-temperature quantum thermometry via dynamical control
- Optimal Probes for Global Quantum Thermometry
- Inductively shunted transmon qubit with tunable transverse and longitudinal coupling
- Tight bound on finite-resolution quantum thermometry at low temperatures
- Bath-Induced Correlations Enhance Thermometry Precision at Low Temperatures
- Thermometry of Strongly Correlated Fermionic Quantum Systems using Impurity Probes
- Collective heat capacity for quantum thermometry and quantum engine enhancements
- Low-temperature quantum thermometry boosted by coherence generation
- Parametric longitudinal coupling between a high-impedance superconducting resonator and a semiconductor quantum dot singlet-triplet spin qubit
- Entropic bounds on information backflow
- Multi-spin probes for thermometry in the strong-coupling regime
- Quantum sensing of temperature close to absolute zero in a Bose-Einstein condensate
- Non-equilibrium readiness and accuracy of Gaussian Quantum Thermometers
- Non-Markovian temperature sensing
- Holevo skew divergence for the characterization of information backflow
- Invasiveness of non-equilibrium quantum thermometry
- Improving the precision of frequency estimation via long-time coherences
- Sub-Ohmic spin-boson model with off-diagonal coupling: Ground state properties
- Harnessing coherence generation for precision single- and two-qubit quantum thermometry
- Readout error mitigated quantum state tomography tested on superconducting qubits
- Strongly coupled fermionic probe for nonequilibrium thermometry
- Space-time dual quantum Zeno effect: Interferometric engineering of open quantum system dynamics
- Thermometry Based on a Superconducting Qubit
- Mixing thermal coherent states for precision and range enhancement in quantum thermometry
- Single-qubit probes for temperature estimation in the presence of collective baths
- Quantum metrology of a structured reservoir
- Coherence-enhanced single-qubit thermometry out of equilibrium