Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Log inSign up
Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Blog
Job Board
Q3AS

© 2026 Aqora Quantum S.A.S.

TermsPrivacyLegal Notice

Chinese Physics Letters

Entangled Radiation through an Atomic Reservoir Controlled by Coherent Population Trapping

李茜, 钟文学, 胡响明

Published Jan 1, 2008• 0 citations
OpenAlex

Abstract

我们证明产生纠缠的 Einstein-Podolsky-Rosen (EPR ) 是可能的用一座原子水库的放射由协调人口套住控制了。三水平的原子的一根横梁开始在套住的在协调附近的人口(CPT ) 被准备状态和行为作为一座长寿控制连贯的水库。四波浪的混合导致与原子偶极子转变的 Rabi 边带反响的洞模式的扩大。洞模式演变为一个 EPR 状态，其纠纷的度被紧张和开车的频率控制，回答。这个计划使用长寿 CPT 连贯并且对原子横梁的自发的排放是柔韧的。同时，这个计划在一个一步舞过程，不是在在 Phys 被要求的一个二拍子的圆舞过程被实现。加快。Lett。98 (2007 ) 240401。[从作者抽象]

Related papers

Entangled Radiation through an Atomic Reservoir Controlled by Coherent Population Trapping

Qian Li, Wenxue Zhong, Xiangming Hu

We show that it is possible to generate Einstein–Podolsky–Rosen (EPR) entangled radiation using an atomic reservoir controlled by coherent population trapping. A beam of three-level atoms is initially prepared in near-coherent population trapping (CPT) state and acts as a long-lived coherence-controlled reservoir. Four-wave mixing leads to amplification of cavity modes resonant with Rabi sidebands of the atomic dipole transitions. The cavity modes evolve into an EPR state, whose degree of entanglement is controlled by the intensities and the frequencies of the driving fields. This scheme uses the long-lived CPT coherence and is robust against spontaneous emission of the atomic beam. At the same time, this scheme is implemented in a one-step procedure, not in a two-step procedure as was required in Phys. Rev. Lett. 98 (2007) 240401.

Chinese Physics Letters•Sep 1, 2008•2 citations

Analysis of entanglement source based on coherent feedback control

Yaoyao Zhou, Pengfei Li, Zhihui Yan +1 more

基于非测量的量子相干反馈控制系统不会引入额外的噪声, 可以用于稳定、操控和改善多种量子系统的性能. 利用相干反馈的方法可以操控非简并光学参量放大器, 在一定条件下能够增强其输出Einstein-Podolsky-Rosen (EPR)纠缠态光场的纠缠度. 相干反馈控制系统中的核心光学元件是控制耦合镜, 其透射率的选取直接影响反馈控制的效果. 本文针对控制耦合镜对偏振相互垂直的种子光场透射率不同的情况, 从理论上分析了该情况对相干反馈控制效果的影响, 得出相干反馈的正作用达到最佳时对控制镜透射率的要求, 理论分析与实验结果相吻合. 同时分析了相干反馈控制效果随其他物理参量的变化关系, 得出系统进一步优化的实验条件. 为今后相干反馈控制系统中物理参量的选择提供依据, 也为利用相干反馈操控更多的量子系统提供参考.

Acta Physica Sinica•Jan 1, 2019•1 citation

Manipulation of the asymmetric Einstein–Podolsky–Rosen steering via coherent population transfer

Jingyan Li, Quan Chen

Abstract We investigate the Einstein–Podolsky–Rosen (EPR) steering of two cavity modes generated via four-wave mixing processes. For a three-level V-type configuration, a strong coherent field as a dressing field couples the atoms, and a weak coherent field as a control filed resonantly couples one dressed state to the auxiliary state. By using the approach of dressed states and Bogoliubov modes, we find that only one Bogoliubov mode is mediated into the interaction with the dressed atoms, and the other one is decoupled. Due to the presence of the coherent control filed, the channel for dressed state population transfer is established, which plays a key role in the generation of the asymmetric EPR steering of two cavity fields. It is shown that the one-way EPR steering can be manipulated by the Rabi frequencies of the control field and the cooperativity parameters.

Laser Physics Letters•May 12, 2021•1 citation

Coherent population trapping in quantum systems

B. D. Agap'ev, M. B. Gornyi, Boris G. Matisov +1 more

Когерентное пленение населенностей в квантовых системах, Агапьев Б.Д., Горный М.Б., Матисов Б.Г., Рождественский Ю.В.

Uspekhi Fizicheskih Nauk•Jan 1, 1993•89 citations

Sensitivity to thermal noise of atomic Einstein-Podolsky-Rosen entanglement

Robert J. Lewis-Swan, Karen V. Kheruntsyan

We examine the prospect of demonstrating Einstein-Podolsky-Rosen (EPR) entanglement for massive particles using spin-changing collisions in a spinor Bose-Einstein condensate. Such a demonstration has recently been attempted by Gross et al. [Nature (London) 480, 219 (2011)] using a condensate of ${}^{\text{87}}$Rb atoms trapped in an optical lattice potential. For the condensate initially prepared in the $(F,{m}_{F})=(2,0)$ hyperfine state, with no population in the ${m}_{F}=\ifmmode\pm\else\textpm\fi{}1$ states, we predict a significant suppression of the product of inferred quadrature variances below the Heisenberg uncertainty limit, implying strong EPR entanglement. However, such EPR entanglement is lost when the collisions are initiated in the presence of a small (currently undetectable) thermal population ${\overline{n}}_{\mathrm{th}}$ in the ${m}_{F}=\ifmmode\pm\else\textpm\fi{}1$ states. For condensates containing 150--200 atoms, we predict an upper bound of ${\overline{n}}_{\mathrm{th}}\ensuremath{\simeq}1$ that can be tolerated in this experiment before EPR entanglement is lost.

arXiv:1304.0297•Physical Review A•Jun 25, 2013•26 citations

EPR-Problem (Einstein-Podolsky-Rosen Problem)

Peter Mittelstaedt

Compendium of Quantum Physics•Jan 1, 2009•0 citations
我们证明产生纠缠的 Einstein-Podolsky-Rosen (EPR ) 是可能的用一座原子水库的放射由协调人口套住控制了。三水平的原子的一根横梁开始在套住的在协调附近的人口(CPT ) 被准备状态和行为作为一座长寿控制连贯的水库。四波浪的混合导致与原子偶极子转变的 Rabi 边带反响的洞模式的扩大。洞模式演变为一个 EPR 状态，其纠纷的度被紧张和开车的频率控制，回答。这个计划使用长寿 CPT 连贯并且对原子横梁的自发的排放是柔韧的。同时，这个计划在一个一步舞过程，不是在在 Phys 被要求的一个二拍子的圆舞过程被实现。加快。Lett。98 (2007 ) 240401。[从作者抽象]
We show that it is possible to generate Einstein–Podolsky–Rosen (EPR) entangled radiation using an atomic reservoir controlled by coherent population trapping. A beam of three-level atoms is initially prepared in near-coherent population trapping (CPT) state and acts as a long-lived coherence-controlled reservoir. Four-wave mixing leads to amplification of cavity modes resonant with Rabi sidebands of the atomic dipole transitions. The cavity modes evolve into an EPR state, whose degree of entanglement is controlled by the intensities and the frequencies of the driving fields. This scheme uses the long-lived CPT coherence and is robust against spontaneous emission of the atomic beam. At the same time, this scheme is implemented in a one-step procedure, not in a two-step procedure as was required in Phys. Rev. Lett. 98 (2007) 240401.
基于非测量的量子相干反馈控制系统不会引入额外的噪声, 可以用于稳定、操控和改善多种量子系统的性能. 利用相干反馈的方法可以操控非简并光学参量放大器, 在一定条件下能够增强其输出Einstein-Podolsky-Rosen (EPR)纠缠态光场的纠缠度. 相干反馈控制系统中的核心光学元件是控制耦合镜, 其透射率的选取直接影响反馈控制的效果. 本文针对控制耦合镜对偏振相互垂直的种子光场透射率不同的情况, 从理论上分析了该情况对相干反馈控制效果的影响, 得出相干反馈的正作用达到最佳时对控制镜透射率的要求, 理论分析与实验结果相吻合. 同时分析了相干反馈控制效果随其他物理参量的变化关系, 得出系统进一步优化的实验条件. 为今后相干反馈控制系统中物理参量的选择提供依据, 也为利用相干反馈操控更多的量子系统提供参考.
Abstract We investigate the Einstein–Podolsky–Rosen (EPR) steering of two cavity modes generated via four-wave mixing processes. For a three-level V-type configuration, a strong coherent field as a dressing field couples the atoms, and a weak coherent field as a control filed resonantly couples one dressed state to the auxiliary state. By using the approach of dressed states and Bogoliubov modes, we find that only one Bogoliubov mode is mediated into the interaction with the dressed atoms, and the other one is decoupled. Due to the presence of the coherent control filed, the channel for dressed state population transfer is established, which plays a key role in the generation of the asymmetric EPR steering of two cavity fields. It is shown that the one-way EPR steering can be manipulated by the Rabi frequencies of the control field and the cooperativity parameters.
We examine the prospect of demonstrating Einstein-Podolsky-Rosen (EPR) entanglement for massive particles using spin-changing collisions in a spinor Bose-Einstein condensate. Such a demonstration has recently been attempted by Gross et al. [Nature (London) 480, 219 (2011)] using a condensate of 87{}^{\text{87}}87Rb atoms trapped in an optical lattice potential. For the condensate initially prepared in the (F,mF)=(2,0)(F,{m}_{F})=(2,0)(F,mF​)=(2,0) hyperfine state, with no population in the ${m}_{F}=\ifmmode\pm\else\textpm\fi{}1$ states, we predict a significant suppression of the product of inferred quadrature variances below the Heisenberg uncertainty limit, implying strong EPR entanglement. However, such EPR entanglement is lost when the collisions are initiated in the presence of a small (currently undetectable) thermal population n‾th{\overline{n}}_{\mathrm{th}}nth​ in the ${m}_{F}=\ifmmode\pm\else\textpm\fi{}1$ states. For condensates containing 150--200 atoms, we predict an upper bound of ${\overline{n}}_{\mathrm{th}}\ensuremath{\simeq}1$ that can be tolerated in this experiment before EPR entanglement is lost.