Multiparameter Quantum Metrology in Molecular Dimers

• URL: http://arxiv.org/abs/2607.11831v1
• Date: Mon, 13 Jul 2026 17:23:54 GMT
• Title: Multiparameter Quantum Metrology in Molecular Dimers
• Abstract summary: We use a vectorization approach to derive the quantum Fisher information matrix.<n>We show that simultaneous estimation outperforms the individual one in the near-resonant and low-temperature regime.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: We investigate multiparameter quantum estimation in a molecular dimer composed of two dipole--dipole interacting two-level systems, focusing on the simultaneous estimation of temperature $T$ and detuning $Λ$. By employing a vectorization approach to derive the quantum Fisher information matrix, we analyze the precision limits of both simultaneous and individual estimation strategies. We show that simultaneous estimation outperforms the individual one in the near-resonant and low-temperature regime, where quantum coherence is enhanced, while its advantage is progressively reduced under detuned conditions and increasing temperature. Our results demonstrate that temperature acts as a key control parameter governing both estimation precision providing a unified perspective on quantum metrology. These findings highlight the potential of molecular quantum systems as realistic platforms for multiparameter quantum sensing.

Related papers

• Multiparameter Quantum Estimation in a Raman-Coupled Two-Qubit System [0.0]
  We study the simultaneous estimation of the temperature and Raman coupling strength in a Raman-coupled two-qubit system at thermal equilibrium.<n>Our results reveal optimal operating regimes determined by the interplay between thermal fluctuations and coherent interactions.<n>These results provide analytical insights into the ultimate precision limits of Raman-coupled two-qubit systems.
  arXiv  Detail & Related papers  (2026-07-13T17:17:14Z)
• Interplay Between Quantum Coherence and Multiparameter Quantum Estimation in Graphene [0.0]
  We focus on the estimation of two relevant physical parameters, namely the temperature $T$ and the wave vector $k_x$, in a graphene-based system.<n>We analyze how their variations affect both quantum coherence and the achievable metrological precision.
  arXiv  Detail & Related papers  (2026-07-06T22:06:56Z)
• Quantum metrology of electric and magnetic dipole moments: ultimate limits and optimal regimes [0.0]
  characterization of electric and magnetic dipole moments (EDM and MDM) in quantum systems is central to fundamental physics and quantum sensing.<n>We address the ultimate precision limits for separate and simultaneous estimation of both dipole moments in a generic two-level system coupled to electromagnetic fields.<n>Our results provide a unified metrological framework for estimation schemes ranging from neutron EDM searches to molecular magnetometry.
  arXiv  Detail & Related papers  (2026-06-24T07:45:19Z)
• Controlling multiparameter quantum estimation in exciton-optomechanics system [0.0]
  We investigate multiparameter quantum estimation in a hybrid exciton--optomechanical system.<n>The influence of several experimentally relevant parameters, including temperature, driving power, optomechanical coupling strength, and dissipation rates, is investigated.<n>We show that strong hybrid interactions and low-temperature regimes significantly enhance the estimation precision.
  arXiv  Detail & Related papers  (2026-06-08T02:51:32Z)
• Multiparameter quantum estimation and Stirling Engine Performance in a Gravitational Cat State System [0.0]
  We investigate the quantum estimation and quantum thermodynamics properties of a gravitational cat state (gravcat) system composed of two interacting massive particles.<n>We employ the quantum Fisher information matrix (QFIM) to analyze the precision limits for estimating the three fundamental parameters of the model.<n>The thermodynamic behavior of the system is analyzed within the framework of a quantum Stirling cycle.
  arXiv  Detail & Related papers  (2026-03-19T15:17:35Z)
• Thermalization and Criticality on an Analog-Digital Quantum Simulator [133.58336306417294]
  We present a quantum simulator comprising 69 superconducting qubits which supports both universal quantum gates and high-fidelity analog evolution. We observe signatures of the classical Kosterlitz-Thouless phase transition, as well as strong deviations from Kibble-Zurek scaling predictions. We digitally prepare the system in pairwise-entangled dimer states and image the transport of energy and vorticity during thermalization.
  arXiv  Detail & Related papers  (2024-05-27T17:40:39Z)
• Ab-initio variational wave functions for the time-dependent many-electron Schrödinger equation [41.94295877935867]
  We introduce a variational approach for fermionic time-dependent wave functions, surpassing mean-field approximations. We use time-dependent Jastrow factors and backflow transformations, which are enhanced through neural networks parameterizations. The results showcase the ability of our variational approach to accurately capture the time evolution, providing insight into the quantum dynamics of interacting electronic systems.
  arXiv  Detail & Related papers  (2024-03-12T09:37:22Z)
• Universality of critical dynamics with finite entanglement [68.8204255655161]
  We study how low-energy dynamics of quantum systems near criticality are modified by finite entanglement. Our result establishes the precise role played by entanglement in time-dependent critical phenomena.
  arXiv  Detail & Related papers  (2023-01-23T19:23:54Z)
• 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)
• Quantum Phases of Matter on a 256-Atom Programmable Quantum Simulator [41.74498230885008]
  We demonstrate a programmable quantum simulator based on deterministically prepared two-dimensional arrays of neutral atoms. We benchmark the system by creating and characterizing high-fidelity antiferromagnetically ordered states. We then create and study several new quantum phases that arise from the interplay between interactions and coherent laser excitation.
  arXiv  Detail & Related papers  (2020-12-22T19:00:04Z)
• In and out of equilibrium quantum metrology with mean-field quantum criticality [68.8204255655161]
  We study the influence that collective transition phenomena have on quantum metrological protocols. The single spherical quantum spin (SQS) serves as stereotypical toy model that allows analytical insights on a mean-field level.
  arXiv  Detail & Related papers  (2020-01-09T19:20:42Z)

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.