Measuring the temperature and heating rate of a single ion by imaging

Srivathsan, Bharath; Fischer, Martin S.; Alber, Lucas; Weber, Markus; Sondermann, Markus; Leuchs, Gerd

doi:10.1088/1367-2630/ab4f43

Cited by 9 publications

(4 citation statements)

References 33 publications

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“…(55)式的积分可以被写为 [27] ⟨J 实验上已经成功构造出了离子晶体的多种构型, 比如直线构型、之字构型 [40] 、螺旋构型 [41] 和带拓扑结的之字构型 [42] . 实验上也实现了离子晶体在不同构型之间的结构相变 [43] , 而且观察到温度对离子晶体构型的影响 [44,45] . 目前对有关低维系统热传导的理论已经在实验室中有所应用, 比如在离子阱中的协同冷却技术, 这种技术能够在只对离子晶体中的一个离子进行冷却的情况下, 降低离子晶体中所有离子的温度 [49,50] .…”

Section: 并且满足以下条件unclassified

Research progress of heat transport in trapped-ion crystals

Li,

Chen,

Feng

2024

Acta Phys. Sin.

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Heat transport is one of the most important research topics in physics. Especially in recent years, with deep study on single-molecule devices, people have been paying more and more attention to the problem of heat transport in low-dimensional (i.e., one- and two-dimensional) microsystems. In the research of Fermi-Pasta-Ulam crystals and harmonic crystals, it was widely accepted that heat conduction in low-dimensional systems does not follow Fourier's law. Due to absence of the equipment capable of directly measuring heat current, conducting relevant experiments is proven to be a challenging task. Ion crystals in ion traps are located in vacuum without energy exchange with the external environment. Their crystal structure and temperature can be accurately controlled by electric and optical fields, providing an ideal experimental platform for studying thermal conduction in low-dimensional crystals in classical or quantum states. This article summarizes the recent theoretical research on thermal conduction in ion crystals, including calculating methods of temperature distribution and steady-state heat current in one-dimensional, two-dimensional, and three-dimensional models, as well as the characteristics of heat current and temperature distribution under different ion crystal configurations. Because the nonlinear effect caused by the imbalance among three dimensions hinders the heat transport, the heat current in ion crystals is largest in the linear configuration while smallest in the zig-zag configuration. In addition, this article also introduces the influence of disorder on the thermal conductivity of ion crystals, encompassing the influence on the heat current across various ion crystal configurations such as the linear, the zig-zag and the helical.Notably, the susceptibility of ion crystals to disorder increases with their sizes. Specifically, the zig-zag ion crystal configurations exhibit the largest susceptibility to disorder, whereas linear configurations are least affected. Finally, this article provides a concise overview of experimental investigations for the heat conduction in low-dimensional systems. Examination of the heat conduction in ion crystals offers insights into various cooling techniques employed in ion trap systems, including sympathetic cooling, electromagnetic induced transparency cooling, and polarization gradient cooling. Similar to the macroscopic thermal diode crafted using thermal metamaterials, it is also possible to manufacture microscopic thermal diodes in low-dimensional systems.

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Section: 并且满足以下条件unclassified

Research progress of heat transport in trapped-ion crystals

Li,

Chen,

Feng

2024

Acta Phys. Sin.

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“…Thus, we can tune the temperature associated with the axial motion, typically between about 1 mK up to 200 mK. In order to relate the applied noise amplitude with temperature, we use the spatial thermometry technique [30,34]. We determine the RMS width of the ion ∆z th , see Fig.…”

Section: Experimental Implementation Of Coherent Wave Packet Excitati...mentioning

confidence: 99%

Single Ion Thermal Wave Packet Analyzed Via Time-Of-Flight Detection

Stopp,

Ortiz-Gutiérrez,

Lehec

et al. 2021

Preprint

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A single 40 Ca ion is confine in the harmonic potential of a Paul trap and cooled to a temperature of a few mK, with a wave packet of sub-µm spatial and sub-m /s velocity uncertainty. Deterministically extracted from the Paul trap, the single ion is propagating over a distance of 0.27 m and detected. By engineering the ion extraction process on the initial wave packet, theoretically modeling the ion trajectories, and studying experimentally the time-of-flight distribution, we directly infer the state of the previously trapped ion. This analysis allows for accurate remote sensing of the previous motional excitation in the trap potential, both coherently or incoherently. Our method paves a way to extract, manipulate and design quantum wave packets also outside of the Paul trap.

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“…The spatial spread of the atom is important for experiments requiring strong interaction of the atoms with tightly focused light and needs to be small in comparison to the size of the focal spot. [ 9–11 ] This requirement is particularly stringent when focusing a dipole wave from full solid angle, where the full widths at half maximum of the point spread function are 0.4 wavelengths in the lateral direction and about 0.6 wavelengths along the optical axis, respectively. The spatial spread of the atom along direction i is given by

σ_{i} = σ_{0, i} \cdot \sqrt{1 + {\overset{n}{true}}_{i}}

with

σ_{0, i} = \sqrt{ℏ / 2 m ω_{i}}

the spread of the atom in the ground state of an harmonic oscillator of mass m and trap frequency

ω_{i}

.…”

Section: Characteristics Of the Optical Trapmentioning

confidence: 99%

“…[6,7] The maximum possible coupling is also affected by the thermal motion of the trapped ion. [5,6,9] This thermal motion results in a spatial averaging over the electric field in the tight focal spot and thus in an effective reduction of the amplitude experienced by the ion. The same effect was also observed for neutral atoms in an optical dipole trap [10,11] and counteracted by polarization gradient cooling.…”

Section: Introductionmentioning

confidence: 99%

Prospects of Trapping Atoms with an Optical Dipole Trap in a Deep Parabolic Mirror for Light–Matter‐Interaction Experiments

2020

Self Cite

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The prospects of employing a deep parabolic mirror as a focusing device for trapping neutral atoms in an optical dipole trap are evaluated. It is predicted that such a dipole trap will result in a deep trapping potential as well as in a small spatial spread of the atom's center of mass wave function already for a Doppler cooled atom. This strong confinement is beneficial for many applications, one of which is the increase of the interaction strength between an atom and a light field focused from full solid angle.

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Measuring the temperature and heating rate of a single ion by imaging

Cited by 9 publications

References 33 publications

Research progress of heat transport in trapped-ion crystals

Research progress of heat transport in trapped-ion crystals

Single Ion Thermal Wave Packet Analyzed Via Time-Of-Flight Detection

Prospects of Trapping Atoms with an Optical Dipole Trap in a Deep Parabolic Mirror for Light–Matter‐Interaction Experiments

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