Transferringsinglecesiumatomsbetweenamagneto-opticaltrapandafar-off-resonanceopticaldipoletrap资源-CSDN文库

首发论文

63 浏览量 2019-12-30 00:48:28 上传评论收藏 389KB PDF 举报

资源推荐

资源详情

资源评论

http://www.paper.edu.cn

-1-

Transferring single cesium atoms between a magneto-optical

trap and a far-off-resonance optical dipole trap

He Jun, Wang Jing, Yang Baodong, Zhao Jiangyan, Zhang Tiancai, Wang Junmin

1**

State Key Laboratory of Quantum Optics and Quantum Optics Devices (Shanxi University),

and Institute of Opto-Electronics, Shanxi University, Taiyuan, Shanxi, China (030006)

Abstract

Based on our work of trapping single cesium atoms in a large-magnetic-gradient vapour-cell

magneto-optical trap (MOT), a remarkable improvement in the signal-to-noise ratio (SNR) has been

made. Also a far-off-resonance optical dipole trap (FORT) formed by a strongly-focused 1064nm single

frequency Nd:YVO

laser beam is introduced. One cesium atom is prepared in the MOT, and then the

atom can be transferred successfully between the MOT and the FORT which is overlapped with the

MOT. Utilizing the effective transferring, the lifetime of trapped single atoms in the FORT is measured,

and it is 6.9 s ± 0.3 s. It provides a system allowing us to manipulate the atomic qubit coherently.

Keywords: single atoms, magneto-optical trap, far-off-resonance optical dipole trap, lifetime of

trapped single atoms

PACC: 3280P, 3280, 4250

1. Introduction

The experiment with individual quantum systems made it possible to investigate quantum

effects on the fundamental level. One topic which is receiving more and more attention is

Quantum Information Processing (QIP). The manipulation of only a single or a few atoms is to

provide us machine and tools suitable for quantum qubit, entanglement and generation of single

photons. 2000, Frese et. al.

stored small and deterministic number of neutral atoms in an optical

dipole trap and they had also prepared atoms in a certain hyperfine state and demonstrated the

feasibility of a state-selective detection

[1]

. 2001, Kuhr et. al. loaded one cold cesium atom into a

standing-wave dipole trap from a magneto-optical trap. By controlling the motion of the standing

wave, they adiabatically transported the atom with sub-micrometer precision over macroscopic

distances on the order of a centimeter

[2]

. 2003, Schrader et. al. demonstrated the realization of a

quantum register with a string of single neutral atoms which were trapped in an optical dipole trap

[3]

. 2005, Grangier group, by illuminating an individual rubidium atom stored in a tight optical

tweezer with short resonant light pulses, they created an efficient triggered source of single

photons with high-rate, and measured intensity correlation of the emitted light pulses showing

almost perfect anti-bunching. They also achieved quantum interference between two single

photons emitted by independently trapped atoms in 2006

[4-5]

. The coherent control of a few

trapped atoms is a crucial element for a quantum system. It is thus of fundamental importance for

future applications in quantum communication and information processing

[6-7]

Neutral atom MOT is a very efficient tool for cooling and trapping atoms

[8-9]

. Unfortunately,

MOT is dissipative trapping, the interacting of cooling and trapping light with the trapped atoms is

nearly resonant, the spontaneous photons scatter rate is so large that the trapping rapidly destroy

the coherence of atomic state. On the other hand, we also can not tell when and how many atoms

This work is partially supported by the National Natural Science Foundation of China (Grant Nos. 60578018,

10434080), by the NSFC Project for excellent research team (Grant No.60821004), by the Program for New

Century Excellent Talents of the Education Ministry of China (Grant No. NCET-07-0524), by the State Key

Research Program of China (Grant No. 2006CB921102), by the Specialized Research Fund for the Doctoral

Program of China (Grant No. 20070108003), by the Natural Science Foundation of Shanxi Province (Grant No.

2007011003), and by the Scientific Research Funds for Returned Scholars Abroad of Shanxi Province.

** Corresponding author, email: wwjjmm@sxu.edu.cn

http://www.paper.edu.cn

-2-

can be trapped from the background because the trapping is a completely random process. All

these further limit the application of the trapped atoms to quantum communication.

The conservative potential of a dipole trap allows trapping with long coherence time

[10-12]

FORT can confine atoms in all ground states for a long time as it is created by the interaction of a

far-detuned laser beam with the atomic dipole moment, and the photon scattering rate is quite

small

[1, 13-16]

. In general, there are two kinds schemes to load single atoms from MOT into FORT

mainly, one is loading a single or a few atoms into FORT from a strong magnetic field gradient

MOT, and the other is loading the single atoms in a microscopic FORT from MOT making use of

near-resonant light assisted collisional blockade effect

[17]

In this paper, we present a description of our experimental setup, which trap single atoms in

the MOT with a high signal-to-noise ratio. And then load single atom into the FORT from the

MOT, also we measure the atoms lifetime trapped in the FORT, and it is 6.9 s ± 0.3 s. It provides a

system allowing us to manipulate the atomic qubit coherently.

2. Principles

We consider the atom as a simple classical or quantum-mechanical oscillator to derive the

main equations for the optical dipole interaction

[1]

. When an atom interacts with the laser beam,

the electronic field E induces an atomic dipole moment

, α is polarizability, which

oscillates at the driving frequency ω. The interaction potential of induced dipole moment P in the

driving field E is given by

Re( )

dip

=− =−⋅

Here I is the laser beam intensity. For the practical case of a detuning much larger than the natural

linewidth (

ωω

−Γ ) we can derive expressions for the trap depth and the scattering rate with

the rotating wave approximation:

()

dip

ωω

−Γ

−

23 2

000

()

πω

ωωω

−h

Quantum-mechanical description can also give the same results. Because of the interaction,

the atomic ground state and excited state are shifted downwards or upwards in the case of negative

detuning ∆<0 (∆ = ω

- ω). In other words, the dipole trap potential for atomic level is thus its light

shift (AC Stark shift). Actually, atoms possesses multi-level, we can construct the total

Hamiltonian including all interactions. Usually the two-level approximation is appropriate in our

working condition.

The use of far off detuning dipole traps leads to nearly non-dissipative potentials with very

low spontaneous emission rates, in which pre-cooled atoms can be trapped. We can combine the

convenience of the MOT for trapping and cooling atoms and with the advantages for quantum

manipulation offered by the nearly conservative potential of optical dipole traps.

3. Experiments

剩余6页未读，继续阅读

评论收藏

内容反馈

weixin_38692043

粉丝: 9
资源: 947

Transferring single cesium atoms between a magneto-optical trap ...

最新资源

Transferring single cesium atoms between a magneto-optical trap ...

All-optical buffer and shaper based on complex-modulated long-period-grating coupler and self-closed fiber loop

sqoop-1.4.6.bin__hadoop-2.0.4-alpha+mysql-connector-java-5.1.40-bin+jdk-8u221

Avatar-Net: Multi-scale Zero-shot Style Transfer by Feature Decoration

grub4dos-V0.4.6a-2017-02-04更新

Learning and Transferring IDs Representationin E-commerce

Non-classical correlation between a single photon and the collective spin excited state of a cold atomic ensemble

计算机网络第六版答案

Learning React (2nd Edition)

Learning React A Hands-On Guide to Building Web Applications

Senfore_DragDrop_v4.1

A Comprehensive Survey on Transfer Learning.pdf

Big Data Made Easy - A Working Guide To The Complete Hadoop Toolset

UserPlane Location Protocol

Learning React [2016]下载

Serv-U File Server Platinum 12.1.0.8

mysql-5.7.38-linux-glibc2.12-x86_64.tar.gz

华为三层交换机s5700-24tp-si-ac交换机固件

Transferring the stability of iodine-stabilized diode laser at 634 nm to radio frequency by an optical frequency comb

Universal-USB-Installer

ANSYS SpaceClaim 2016 User Guide

Wiley.Publishing.Fedora.Linux.Toolbox.1000+.Commands.for.Fedora.CentOS.and.Red.Hat.Power.Users.and.Red.Hat.Power.Users.2008.pdf

华为交换机固件 S5700S-P-LI-V200R011C10SPC600

80486 System Architecture [3rd Edition] [1995]

计算机网络英文课件：Chapter2 Application Layer.ppt

Linux Shell Scripting Cookbook

AT-GAN:A Generative Attack Model译文

sqoop-1.4.7.bin__hadoop-2.6.0.tar.gz.zip

Serial ATA AHCI 1.1 Specification.pdf

最新资源