Thermometry Based on a Superconducting Qubit
- URL: http://arxiv.org/abs/2409.02784v2
- Date: Thu, 12 Sep 2024 12:11:39 GMT
- Title: Thermometry Based on a Superconducting Qubit
- Authors: Dmitrii S. Lvov, Sergei A. Lemziakov, Elias Ankerhold, Joonas T. Peltonen, Jukka P. Pekola,
- Abstract summary: We measure the effective temperature of the qubit and characterize its relaxation and coherence times.
We present a numerical model of the qubit population distribution and compare it favorably with the experimental results.
- Score: 0.0
- License: http://creativecommons.org/licenses/by-nc-sa/4.0/
- Abstract: We report temperature measurements using a transmon qubit by detecting the population of the first three levels of it, after employing a sequence of $\pi$-pulses and performing projective dispersive readout. We measure the effective temperature of the qubit and characterize its relaxation and coherence times $\tau_{1,2}$ for three devices in the temperature range 20-300 mK. Signal-to-noise (SNR) ratio of the temperature measurement depends strongly on $\tau_{1}$, which drops at higher temperatures due to quasiparticle excitations, adversely affecting the measurements and setting an upper bound of the dynamic temperature range of the thermometer. The measurement relies on coherent dynamics of the qubit during the $\pi$-pulses. The effective qubit temperature follows closely that of the cryostat in the range 100-250 mK. We present a numerical model of the qubit population distribution and compare it favorably with the experimental results.
Related papers
- Quantum thermometry with single molecules in portable nanoprobes [0.0]
We present a portable nanothermometer based on a molecular two-level quantum system that operates in the 3 - 30 K temperature range.
We validate the performance of this molecular thermometer on nanostructures, by estimating the thermal conductivity of a patterned silicon membrane.
arXiv Detail & Related papers (2023-03-07T09:24:04Z) - 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) - 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) - 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) - Uninformed Bayesian Quantum Thermometry [0.0]
We study the Bayesian approach to thermometry with no prior knowledge about the expected temperature scale.
We propose two new estimators based on an optimization of relative deviations.
arXiv Detail & Related papers (2021-08-16T11:39:01Z) - 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) - 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) - Real-time estimation of the optically detected magnetic resonance shift
in diamond quantum thermometry [47.50219326456544]
We investigate the real-time estimation protocols for the frequency shift of optically detected magnetic resonance (ODMR) of nitrogen-vacancy centers in nanodiamonds (NDs)
Efficiently integrating multipoint ODMR measurements and ND particle tracking into fluorescence microscopy has recently demonstrated stable monitoring of the temperature inside living animals.
arXiv Detail & Related papers (2020-06-12T01:44:35Z) - 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)
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.