Experimental implementation of a nonthermalizing quantum thermometer

Raitz, Cesar; Souza, Alexandre M.; Auccaise, R.; Sarthour, R. S.

doi:10.1007/s11128-014-0858-z

Cited by 20 publications

(21 citation statements)

References 13 publications

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“…Finally, it is worth mentioning that even though quantum coherence in the initial state of the probe may not be directly linked to the overall maximization of the precision, the potential role played by quantumness in thermometry remains an open problem [13,15] that deserves a study on its own.…”

Section: Discussionmentioning

confidence: 99%

“…Similarly, the ground state of colour centres in nano-diamonds has already been used as a fluorescent thermometer [3][4][5], achieving precisions down to the millikelvin scale, and a spatial resolution of few hundreds of nanometers. Thermometry applied to micro-mechanical resonators [10][11][12], and nuclear spins [13] has also been subject of investigation. Other studies have focused on more fundamental questions such as the scaling of the precision of temperature estimation with the number of quantum probes [14], and the potential role played by coherence and entanglement in simple thermometric tasks [15].…”

Section: Introductionmentioning

confidence: 99%

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Individual Quantum Probes for Optimal Thermometry

et al. 2015

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The unknown temperature of a sample can be estimated with minimal disturbance by putting it in thermal contact with an individual quantum probe. If the interaction time is sufficiently long so that the probe thermalizes, the temperature can be read out directly from its steady state. Here we prove that the optimal quantum probe, acting as a thermometer with maximal thermal sensitivity, is an effective two-level atom with a maximally degenerate excited state. When the total interaction time is insufficient to produce full thermalization, we optimize the estimation protocol by breaking it down into sequential stages of probe preparation, thermal contact and measurement. We observe that frequently interrogated probes initialized in the ground state achieve the best performance. For both fully and partly thermalized thermometers, the sensitivity grows significantly with the number of levels, though optimization over their energy spectrum remains always crucial.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Individual Quantum Probes for Optimal Thermometry

et al. 2015

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“…The sensitivity of the probe increases with the number of levels, but the role of the quantumness of the initial state of the probe on the sensitivity of thermometry is not fully understood yet. Interferometric thermom-etry with a single probe was realized experimentally in an NMR setup in (Raitz et al, 2015) and the role of quantum coherence emphasized. Experimental simulations in quantum optical setups and investigations of the role of quantum coherence were reported in (Mancino et al, 2016;Tham et al, 2016).…”

Section: Interferometric Thermometrymentioning

confidence: 99%

Quantum-enhanced measurements without entanglement

et al. 2018

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Quantum-enhanced measurements exploit quantum mechanical effects for increasing the sensitivity of measurements of certain physical parameters and have great potential for both fundamental science and concrete applications. Most of the research has so far focused on using highly entangled states, which are, however, difficult to produce and to stabilize for a large number of constituents. In the following we review alternative mechanisms, notably the use of more general quantum correlations such as quantum discord, identical particles, or non-trivial Hamiltonians; the estimation of thermodynamical parameters or parameters characterizing non-equilibrium states; and the use of quantum phase transitions. We describe both theoretically achievable enhancements and enhanced sensitivities, not primarily based on entanglement, that have already been demonstrated experimentally, and indicate some possible future research directions. arXiv:1701.05152v2 [quant-ph]

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“…Quantum thermometry is indeed an area undergoing a rapid growth. The idea of using a single qubit as a thermometer has been put forward recently by several groups [26][27][28][29]. In this case, the fluctuations in the temperature estimate should be taken into account [30][31][32], which are expected to follow the Landau relation, ∆T ∼ T 2 /C, where C is the heat capacity of the system.…”

Section: Introductionmentioning

confidence: 99%

Local quantum thermometry using Unruh–DeWitt detectors

Robles¹,

Rodríguez-Laguna²

2017

J. Stat. Mech.

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We propose an operational definition for the local temperature of a quantum field employing Unruh-DeWitt detectors, as used in the study of the Unruh and Hawking effects. With this definition, an inhomogeneous quantum system in equilibrium can have different local temperatures, in analogy with the Tolman-Ehrenfest theorem from general relativity. We study the local temperature distribution on the ground state of hopping fermionic systems on a curved background. The observed temperature tends to zero as the thermometer-system coupling g vanishes. Yet, for small but finite values of g, we show that the product of the observed local temperature and the logarithm of the local speed of light is approximately constant. Our predictions should be testable on ultracold atomic systems.

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Experimental implementation of a nonthermalizing quantum thermometer

Cited by 20 publications

References 13 publications

Individual Quantum Probes for Optimal Thermometry

Individual Quantum Probes for Optimal Thermometry

Quantum-enhanced measurements without entanglement

Local quantum thermometry using Unruh–DeWitt detectors

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