Laser Cooling of Ca to Bose Einstein condensation
激光冷却 Ca 到玻色爱因斯坦凝聚
基本信息
- 批准号:EP/D500583/1
- 负责人:
- 金额:$ 51.74万
- 依托单位:
- 依托单位国家:英国
- 项目类别:Research Grant
- 财政年份:2006
- 资助国家:英国
- 起止时间:2006 至 无数据
- 项目状态:已结题
- 来源:
- 关键词:
项目摘要
Bose-Einstein condensates made by laser cooling and evaporative cooling of atoms are the coldest known substance and are beginning to find a wide range of applications from understanding fluids to precision measurements. Most BoseEinstein condensate to date are based 'one-electron atoms', i.e. the atomic structure is determined by a single electron outside a charged core. This generally leads to an atomic structure ideal for laser cooling but without any particularly narrow spectral lines that would be ideal for precision measurement or optical clocks. On the other hand, the two-electron atoms (such a calcium) offer narrow lines associated with transitions, where an electron spin flips, and are still relatively easy to laser cool.The narrow transition in atomic calcium is key for the present proposal. It will enable us to laser cool the atoms all the way to Bose-Einstein condensation - something that has not been possible to do with other atoms due to the re-absorption of the light scattered on broader lines. An essential part of this is to trap the atoms in the strong light field of a CO2 laser in order to prevent them from falling under gravity while they are slowly cooled on the narrow line.The direct laser cooling to condensation is radically different from the traditional approach, which relies on atomic collisions. It will therefore provide new insight into the formation of condensates. The CO2 laser offers a wide choice of geometry for the condensate. We can generate condensates in 1, 2 and 3 dimensional lattices and study the interaction of many independently created condensates when they are allowed to 'see' each other due to quantum mechanical tunnelling through the separating barriers.The ultimate vision for this work is to use the narrow atomic transition for precision measurements (e.g. an optical clock) in what is known as the Heisenberg limit. That requires the preparation through Bose-Einstein condensation of highly entangled multi-particle states, e.g. N atoms in a superposition of ground and excited states such that if one is found in the ground state then they are all in the ground state or vice versa. With states like this it will be possible to obtain a precision on a measurement, that scales as 1/N (the Heisenberg limit) rather than the 1/sqrt(N) associated with Poissonian statistics. This project will explore and develop a range of technologies for the future realisation of such measurements.
通过激光冷却和原子蒸发冷却产生的玻色-爱因斯坦凝聚体是已知的最冷的物质,并开始发现从理解流体到精确测量的广泛应用。到目前为止,大多数玻色爱因斯坦凝聚体都是基于“单电子原子”的,也就是说,原子结构是由带电核心外的单个电子决定的。这通常会产生一种非常适合激光冷却的原子结构,但没有任何特别窄的谱线,这将是精确测量或光学时钟的理想选择。另一方面,双电子原子(如钙)提供了与电子自旋翻转的跃迁相关的窄线,并且仍然相对容易激光冷却。钙原子的窄跃迁是本提议的关键。它将使我们能够激光冷却原子,直到玻色-爱因斯坦凝聚--这是其他原子不可能做到的,因为散射在更宽谱线上的光被重新吸收。其中一个关键部分是将原子囚禁在CO2激光的强光场中,以防止原子在窄线上缓慢冷却时在重力下坠落。激光直接冷却凝聚与依赖原子碰撞的传统方法有根本不同。因此,它将为凝析油的形成提供新的见解。二氧化碳激光器为凝析油提供了广泛的几何形状选择。我们可以在一维、二维和三维晶格中产生凝聚体,并研究许多独立创建的凝聚体之间的相互作用,当它们被允许通过分离势垒的量子力学隧穿时,它们之间的相互作用。这项工作的最终愿景是使用窄原子跃迁来进行精确测量(例如光钟),这就是众所周知的海森堡极限。这需要通过高度纠缠的多粒子态,例如基态和激发态叠加的N原子的玻色-爱因斯坦凝聚来制备,这样如果发现一个处于基态,那么它们都处于基态,反之亦然。有了这样的状态,就有可能获得测量的精度,其刻度为1/N(海森堡极限),而不是与泊松统计相关的1/Sqrt(N)。该项目将探索和开发一系列技术,以实现未来的这种测量。
项目成果
期刊论文数量(6)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
Infrared Spectroscopy of Magneto-optically Trapped Calcium Atoms
磁光捕获钙原子的红外光谱
- DOI:
- 发表时间:2008
- 期刊:
- 影响因子:0
- 作者:N/a Norris
- 通讯作者:N/a Norris
Laser spectroscopy of the 4 s 4 p 3 P 2 - 4 s 3 d 1 D 2 transition on magnetically trapped calcium atoms
磁捕获钙原子上 4 s 4 p 3 P 2 - 4 s 3 d 1 D 2 跃迁的激光光谱
- DOI:10.1103/physreva.83.062513
- 发表时间:2011
- 期刊:
- 影响因子:2.9
- 作者:Dammalapati U
- 通讯作者:Dammalapati U
Versatile and reliably re-usable ultrahigh vacuum viewport
多功能且可靠可重复使用的超高真空视口
- DOI:
- 发表时间:2009
- 期刊:
- 影响因子:0
- 作者:N/a Weatherill
- 通讯作者:N/a Weatherill
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Erling Riis其他文献
Distributed network of optically pumped magnetometers for space weather monitoring
- DOI:
10.1038/s41598-024-79841-x - 发表时间:
2024-11-15 - 期刊:
- 影响因子:3.900
- 作者:
Marcin S. Mrozowski;Angus S. Bell;Paul F. Griffin;Dominic Hunter;David Burt;James P. McGilligan;Erling Riis;Ciarán D. Beggan;Stuart J. Ingleby - 通讯作者:
Stuart J. Ingleby
Atom funnel for the production of a slow, high-density atomic beam.
用于产生缓慢、高密度原子束的原子漏斗。
- DOI:
10.1103/physrevlett.64.1658 - 发表时间:
1990 - 期刊:
- 影响因子:8.6
- 作者:
Erling Riis;David S. Weiss;K. Moler;Steven Chu - 通讯作者:
Steven Chu
Measurement of the Aharonov-Casher phase in an atomic system.
原子系统中阿哈罗诺夫-卡舍尔相的测量。
- DOI:
- 发表时间:
1993 - 期刊:
- 影响因子:8.6
- 作者:
K. Sangster;E. A. Hinds;Stephen M. Barnett;Erling Riis - 通讯作者:
Erling Riis
A versatile and reliably reusable ultrahigh vacuum viewport.
多功能且可靠、可重复使用的超高真空视口。
- DOI:
10.1063/1.3075547 - 发表时间:
2008 - 期刊:
- 影响因子:0
- 作者:
K. Weatherill;Jonathan D. Pritchard;Paul F. Griffin;U. Dammalapati;Charles S. Adams;Erling Riis - 通讯作者:
Erling Riis
Tunable, single-frequency, diode-pumped 2.3μm VECSEL
可调谐、单频、二极管泵浦 2.3μm VECSEL
- DOI:
10.1364/oe.15.008212 - 发表时间:
2006 - 期刊:
- 影响因子:0
- 作者:
J. Hopkins;A. J. Maclean;D. Burns;Erling Riis;N. Schulz;M. Rattunde;C. Manz;Klaus Köhler;Joachim Wagner - 通讯作者:
Joachim Wagner
Erling Riis的其他文献
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{{ truncateString('Erling Riis', 18)}}的其他基金
Field demonstration of atomic vapour cell magnetometry
原子蒸气室磁力测量的现场演示
- 批准号:
EP/R030456/1 - 财政年份:2018
- 资助金额:
$ 51.74万 - 项目类别:
Research Grant
Feasibility of Magneto-cardiography in Livestock (QuBeat)
家畜心磁图的可行性 (QuBeat)
- 批准号:
EP/R019614/1 - 财政年份:2017
- 资助金额:
$ 51.74万 - 项目类别:
Research Grant
REMOTE - (RuggEd Mirco-ECDL technology for cOld aTom applications in spacE)
REMOTE -(用于太空冷原子应用的 RuggEd Mirco-ECDL 技术)
- 批准号:
EP/R000522/1 - 财政年份:2017
- 资助金额:
$ 51.74万 - 项目类别:
Research Grant
gMOT: Scalable manufacture and evaluation of miniature cold atom traps
gMOT:微型冷原子陷阱的可扩展制造和评估
- 批准号:
EP/R020086/1 - 财政年份:2017
- 资助金额:
$ 51.74万 - 项目类别:
Research Grant
Small-Scale Ring Traps for Atom Interferometry and Quantum Fluid Investigations
用于原子干涉测量和量子流体研究的小型环形陷阱
- 批准号:
EP/G026068/1 - 财政年份:2009
- 资助金额:
$ 51.74万 - 项目类别:
Research Grant
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