Low-temperature quantum thermometry boosted by coherence generation
- URL: http://arxiv.org/abs/2211.05461v4
- Date: Mon, 20 Nov 2023 13:31:41 GMT
- Title: Low-temperature quantum thermometry boosted by coherence generation
- Authors: Asghar Ullah, M. Tahir Naseem, and \"Ozg\"ur E.
M\"ustecapl{\i}o\u{g}lu
- Abstract summary: 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.
- Score: 0.0
- License: http://creativecommons.org/licenses/by/4.0/
- Abstract: The precise measurement of low temperatures is significant for both the
fundamental understanding of physical processes and technological applications.
In this work, we present a method for low-temperature measurement that improves
thermal range and sensitivity by generating quantum coherence in a thermometer
probe. Typically, in temperature measurements, the probes thermalize with the
sample being measured. However, 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. We describe the open system dynamics of the
probe using a global master equation and demonstrate that while the
ancilla-probe system thermalizes with the sample, the probe \textit{per se}
evolves into a nonthermal steady state due to nonlocal dissipation channels.
The populations and coherences of this steady state depend on the sample
temperature, allowing for precise and wide-range low-temperature estimation. We
characterize the thermometric performance of the method using quantum Fisher
information and show that the quantum Fisher information can exhibit multiple
and higher peaks at different low temperatures with increasing quantum
coherence and the number of ancilla qubits. Our analysis reveals that the
proposed approach, using a nonthermal qubit thermometer probe with
temperature-dependent quantum coherence generated by a multiple qubit interface
between a thermal sample and the probe qubit, can enhance the sensitivity of
temperature estimation and broaden the measurable low-temperature range.
Related papers
- 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) - Quantum thermometry with an optomechanical system [0.0]
We present a quantum thermometry method utilizing an optomechanical system composed of an optical field and a mechanical resonator.
We numerically calculate the quantum Fisher information for the probe.
arXiv Detail & Related papers (2023-12-25T10:47:53Z) - Energy measurements remain thermometrically optimal beyond weak coupling [0.0]
We develop a general perturbative theory of finite-coupling quantum thermometry up to second order in probe-sample interaction.
By assumption, the probe and sample are in thermal equilibrium, so the probe is described by the mean-force Gibbs state.
We prove that the ultimate thermometric precision can be achieved - to second order in the coupling.
arXiv Detail & Related papers (2023-02-06T19:01:07Z) - Relativistic quantum thermometry through a moving sensor [0.0]
We find that the thermometry is completely unaffected by the Lamb shift of the energy levels.
We show that a practical technique can be utilized to implement such a quantum thermometry.
arXiv Detail & Related papers (2022-08-08T21:30:53Z) - 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) - Thermometric machine for ultraprecise thermometry of low temperatures [0.0]
We present a thermometric scheme that does not thermalize with the sample whose temperature is measured.
This is made possible thanks to a suitable interaction that couples the probe to the sample and to an auxiliary thermal bath known to be at a higher temperature.
We numerically illustrate an extreme reduction in the number of measurements to attain a given precision.
arXiv Detail & Related papers (2021-08-24T01:37:59Z) - 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) - Uhlmann Fidelity and Fidelity Susceptibility for Integrable Spin Chains
at Finite Temperature: Exact Results [68.8204255655161]
We show that the proper inclusion of the odd parity subspace leads to the enhancement of maximal fidelity susceptibility in the intermediate range of temperatures.
The correct low-temperature behavior is captured by an approximation involving the two lowest many-body energy eigenstates.
arXiv Detail & Related papers (2021-05-11T14:08:02Z) - 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)
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.