首页/论文/physics/0102068

arXiv physics/01020682001-02-21physics.atom-phphysics.gen-ph

磁囚禁亚稳态氦的热化

Thermalization of magnetically trapped metastable helium

A. Browaeys, A. Robert, O. Sirjean, J. Poupard, S. Nowak, D. Boiron, C. I. Westbrook, A. Aspect

备注：: 4 pages, 3 figures
发表信息：: Physical Review A, 64, 034703
DOI：: 10.1103/PhysRevA.64.034703

阅读 PDF ↗

arXiv 页面 ↗HTML 原文 ↗

摘要英文摘要相关论文

摘要：

我们观察到磁囚禁亚稳氦原子的弹性碰撞热化。我们的方法在应用RF刀后直接采样重建热能分布。我们的样品向平衡态的弛豫时间给出了接近幺正极限的弹性碰撞速率常数。

英文摘要：

We have observed thermalization by elastic collisions of magnetically trapped metastable helium atoms. Our method directly samples the reconstruction of a thermal energy distribution after the application of an RF knife. The relaxation time of our sample towards equilibrium gives an elastic collision rate constant close to the unitarity limit.

机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。

阅读原文

阅读 PDF ↗

arXiv 页面 ↗HTML 原文 ↗

本文内容

摘要英文摘要相关论文

机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。

继续探索

相关论文

Thermalization measurements on an ultracold mixture of metastable $^4$He and $^{87}$Rb atoms in a quadrupole magnetic trap

Recently we have reported (Knoop et al. [arXiv:1404.4826]) on an experimental determination of metastable triplet $^4$He+$^{87}$Rb scattering length by performing thermalization measurements for an ultracold mixture in a quadrupole magnetic trap. Here we present our experimental apparatus and elaborate on these thermalization measurements. In particular we give a theoretical description of interspecies thermalization rate for a quadrupole magnetic trap, i. e. in the presence of Majorana heating, and a general procedure to extract the scattering length from the elastic cross section at finite t…

2014-07-25cond-mat.quant-gasphysics.atom-phquant-ph

Understanding one-body losses in magnetically trapped metastable europium atoms

We report the measurement of one-body loss rates for magnetically trapped metastable europium atoms and the study of their loss mechanism. The loss of atoms observed in a magneto-optical trap is not fully understood because of the indivisibility of the loss regarding optical pumpings due to the presence of cooling laser beams. We magnetically trapped the atoms by directly loading from the magneto-optical trap and observed almost identical one-body loss rates of approximately $2.6\,\mathrm{s^{-1}}$ for two isotopes: $\mathrm{{}^{151}Eu}$ and $\mathrm{{}^{153}Eu}$. Our rate-equation-based model,…

2021-08-17cond-mat.quant-gasphysics.atom-ph

Ultracold mixtures of metastable He and Rb: scattering lengths from ab initio calculations and thermalization measurements

We have investigated the ultracold interspecies scattering properties of metastable triplet He and Rb. We performed state-of-the-art ab initio calculations of the relevant interaction potential, and measured the interspecies elastic cross section for an ultracold mixture of metastable triplet $^4$He and $^{87}$Rb in a quadrupole magnetic trap at a temperature of 0.5 mK. Our combined theoretical and experimental study gives an interspecies scattering length $a_{4+87}=+17^{+1}_{-4}$ $a_0$, which prior to this work was unknown. More general, our work shows the possibility of obtaining accurate sc…

2014-07-25cond-mat.quant-gasphysics.atom-phquant-ph

有限深磁阱中冷原子的积累和热化

Accumulation and thermalization of cold atoms in a finite-depth magnetic trap

我们从实验和理论上研究了冷原子从磁光阱（MOT）到有限深度阱的连续积累，包括由射频（RF）场修饰的磁四极阱。MOT中的铬原子（52同位素）被MOT激光器连续地光学泵浦到亚稳态暗态。在存在射频场的情况下，被磁俘获的亚稳态原子的温度可以低至25微K，密度为10 ^17原子·m-3，导致相空间密度增加，但仍被非弹性碰撞限制在7.10^-6。为了研究截断磁阱中的热化问题，我们测量了射频截断磁阱中原子的自由蒸发速率，并推导出原子处于5D 4亚稳态时的平均弹性截面为7.0 × 10^-16 m 2.

2006-12-13physics.atom-ph

在被捕获离子的亚稳电子D态中工程化磁绝缘量子比特

Engineering magnetically insensitive qubits in metastable electronic D-states of trapped ions

IonQ, Inc.（IonQ公司）；Joint Quantum Institute and Department of Physics, University of Maryland（马里兰大学联合量子研究所与物理系）；Infleqtion, Inc.（Infleqtion公司）；National Institute of Standards and Technology（美国国家标准与技术研究院）；Keysight Technologies（是德科技）；Duke Quantum Center, Department of Electrical and Computer Engineering and Department of Physics, Duke University（杜克大学电气与计算机工程系、物理系及杜克量子中心）

本文通过实验在138Ba+原子的D_3/2能级中合成磁绝缘量子比特态，实现了相干操作，并展示了量子比特相干时间提升3倍，为量子计算和网络应用奠定基础。

2026-04-18physics.atom-phquant-ph

利用亚稳态钡的精细结构拉曼干涉术实现抗磁干扰的惯性传感

Fine-structure Raman interferometry with metastable barium for magnetically resilient inertial sensing

Department of Physics, Institute of Science Tokyo（东京科学大学物理系）；Institute of Integrated Research, Institute of Science Tokyo（东京科学大学综合研究学院）；Product Development Center, Japan Aviation Electronics Industry, Ltd.（日本航空电子工业有限公司产品开发中心）

本研究提出基于钡亚稳态精细结构跃迁的拉曼原子干涉仪，大幅降低二次塞曼灵敏度，放宽磁场控制要求，实验实现钡亚稳态间马赫-曾德尔干涉，为抗磁干扰的惯性传感提供关键方案。

2026-10-15physics.atom-ph

更多相关论文收起更多论文

Magnetically tunable Feshbach resonances in Li + Yb($^3P_J$)

We have investigated magnetically tunable Feshbach resonances arising from the interaction of Li($^2S$) with metastable Yb($^3P_2$) and ($^3P_0$). For Yb($^3P_2$), all the resonance features are strongly suppressed by inelastic collisions that produce Yb in its lower-lying $^3P_1$ and $^3P_0$ states. For Yb($^3P_0$), sharp resonances exist but they are extremely narrow (widths less than 1 mG).

2013-07-27physics.atom-ph

亚稳钙原子的磁俘获

Magnetic Trapping of Metastable Calcium Atoms

亚稳态钙原子，在单重态系统内操作的磁光阱（MOT）中产生，连续加载到由MOT的磁四极场形成的磁阱中。在3 mK的MOT温度和240 ms的加载时间下，我们观察到了1.1 x 10^8个磁俘获的3 P2原子，密度为2.4 x 10^8 cm^-3，温度为0.61 mK。在一个修改后的方案中，我们首先在0.18 mK的温度下为亚稳原子加载MOT，随后将这些原子释放到磁阱中。在这种情况下，240 ms的加载产生了2.4 x 10^8个被俘获的3 P2原子，其峰值密度为8.7 x 10^10 cm^-3，温度为0.13 mK。在磁阱中观察到的温度降低，这两种加载方案只能部分地解释由陷阱尺寸效应。

2003-01-27physics.atom-phphysics.gen-ph

囚禁亚稳氢的非弹性碰撞速率

Inelastic Collision Rates of Trapped Metastable Hydrogen

我们报告的第一个详细的衰变研究被困亚稳态（2S）氢。通过对超冷H样品的双光子激发，我们已经产生了密度大于4 × 10^10 cm^-3、温度低于100 \muK的至少5 × 10^7个磁俘获的2S原子云。我们推导出实验值的总2S-2S两体损失率常数在这个温度制度。我们的结果是在最近的理论计算的范围内。我们还发现实验上限的速率常数损失由于非弹性1 S-2S碰撞。

2002-10-05physics.atom-ph

锶$^{3}\mathrm{P}_{2}$亚稳态中的窄线宽介导的Sisyphus冷却

Narrow-line-mediated Sisyphus cooling in the $^{3}\mathrm{P}_{2}$ metastable state of strontium

本文演示了锶$^{3}\mathrm{P}_{2}$态中窄线宽介导的Sisyphus冷却，结合多普勒冷却实现高效冷却，并通过光泵浦实现连续输出，原子数提升两倍，适用于下一代量子传感器。

2025-06-24cond-mat.quant-gasphysics.atom-phquant-ph

超冷亚稳氦原子光缔合谱的频移：s波散射长度的新测量

Frequency shifts of photoassociative spectra of ultracold metastable Helium atoms : a new measurement of the s-wave scattering length

我们观察到磁囚禁的亚稳态$^4$ $^*$原子的单色光缔合光谱中的光致频率移动。在与$2^3S_1 - 2^3P_0$渐近线相连的纯长程$0_u^+$势中，一对超冷自旋极化的$2^3S_1$氦原子被激发到分子束缚态。这种位移是由分子激发束缚态与两个碰撞$2^3S_1$原子的散射态和束缚态的光耦合引起的。我们测量了$0^+_u$势中几个振转能级的频移，发现它与光缔合激光强度呈线性关系。与理论分析的比较提供了一个很好的指示的s-波散射长度$a$的五重态（$^5Σ_g^+$）的潜力，$a=7.2\pm 0.6$ nm，这是显着低于大多数以前的结果通过非光谱方法。

2005-09-22cond-mat.otherphysics.atom-ph

磁阱冷原子云中散射光的原位相干测量：探针驱动的原子动力学

In Situ Coherence Measurements of Scattered Light in Magnetically Trapped Cold Atomic Clouds: Probe-Driven Atomic Dynamics

Université Côte d’Azur, CNRS, INPHYNI（法国蔚蓝海岸大学、法国国家科学研究中心、INPHYNI）；Instituto de Física de São Carlos, Universidade de São Paulo（圣卡洛斯物理研究所、圣保罗大学）

研究利用散射光子时间相关性探测超冷量子气体微观动力学，通过测量87Rb云散射光一阶相关函数，确定相关效应根源，用简单模型恢复理论与实验一致性，为冷气体非平衡动力学等研究铺平道路。

2026-07-22physics.atom-ph

磁阱NH自发振动衰减的时域测量

Time-Domain Measurement of Spontaneous Vibrational Decay of Magnetically Trapped NH

NH（X三重态-σ-，v=1，N=0）的v = 1 -> 0辐射寿命为τ_rad，exp. = 37.0 +/- 0.5 stat +2.0 / -0.8 sys毫秒，对应于跃迁偶极矩|mu_10| = 0.0540 + 0.0009 / -0.0018德拜。为了实现直接时域测量所需的长观察时间，振动激发的NH（X三重态-Sigma-，v=1，N=0）自由基使用氦缓冲气体加载被磁性捕获。NH（v=1，N=0）和NH（v=0，N=0）群体的同时捕获和寿命测量允许精确提取tau_rad，exp。在我们测量τ_rad，exp.，测定了氦原子对NH（v=1，N=0）的碰撞猝灭速率常数kq < 3.9 × 10^-15 cm ^3/s。k_q的这个界限产生了所引用的关于τ_rad，exp的系统不确定性。使用从头计算偶极矩函数和RKR势，我们还确定了这个寿命的理论值为36.99毫秒，与我们的实验值一致。我们的研究结果提供了一个独立的测定tau_rad，10，测试分子理论，并进一步证明了缓冲气体加载和捕获在确定亚稳态辐射和碰撞寿命的功效。

2008-01-19physics.ao-phphysics.atom-ph

Analyzing a single-laser repumping scheme for efficient loading of a strontium magneto-optical trap

We demonstrate enhanced loading of strontium atoms into a magneto-optical trap using a repumping scheme from the metastable state via the doubly-excited state $5\mathrm{s}5\mathrm{p}\,^3\mathrm{P}_2 \rightarrow 5\mathrm{p}^2\,^3\mathrm{P}_2$ at $481~\mathrm{nm}$. The number of trapped atoms is increased by an order of magnitude. The frequency and intensity dependence of the atom number enhancement, with respect to the non-repumping case, is well reproduced by a simple rate equation model, which also describes single-laser repumping schemes reported previously. The repumping scheme is limited b…

2019-02-22physics.atom-ph

磁阱中的非谐混合

Anharmonic mixing in a magnetic trap

我们在实验上观察到磁囚禁亚稳氖原子云在处于非平衡态后的再平衡。利用数值模拟，我们表明，非谐混合，由于在磁阱中的原子的无碰撞动力学的平衡，是在这个平衡的主导过程。我们确定了它的时间依赖于陷阱参数和原子温度。此外，我们在模拟中观察到在陷阱频率比ω_r / ω_z = 3/2处，径向和轴向陷阱尺寸之间的共振能量交换。这种共振现象可以用一个简单的振子模型来解释。

2005-01-07physics.atom-ph

Resonant control of elastic collisions between $^{23}$Na$^{40}$K molecules and $^{40}$K atoms

We have demonstrated the resonant control of the elastic scattering cross sections in the vicinity of Feshbach resonances between $^{23}$Na$^{40}$K molecules and $^{40}$K atoms by studying the thermalization between them. The elastic scattering cross sections vary by more than two orders of magnitude close to the resonance, and can be well described by an asymmetric Fano profile. The parameters that characterize the magnetically tunable s-wave scattering length are determined from the elastic scattering cross sections. The observation of resonantly controlled elastic scattering cross sections …

2022-03-09cond-mat.quant-gasphysics.atom-ph