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

利用绝热过程实现量子信息转移

陈美香, 刘银春

Published Jan 1, 2007• 0 citations
OpenAlex

Abstract

提出一种利用绝热过程实现量子信息转移的方案.Λ型原子和经典场、单模腔场发生相互作用,系统的绝热演化在暗态中进行.利用这种绝热演化可实现Λ型原子间的所有量子信息的转移.用相似的方法还可实现腔场间的量子信息转移.本方案可有效地抑制原子的自发辐射,成功地实现量子信息转移.

Related papers

在多能级Λ系统中基于受激拉曼绝热通道制备叠加态的研究

秦家千, 旷冶, 舒晓琴

用相干激光脉冲耦合单激发态和多个亚稳态和基态的多能级的Λ型系统中,引入了一个两能级的转动群来简化多能级系统,转动后就只有一个末态与激发态相互作用.这样多能级系统就简化为一个简单的四能级系统,在四能级系统中可以制备出任意的初态和末态的叠加态.当所有的斯托克斯脉冲都相等时就得到一个等量的叠加态.最后用数值计算验证分析结果正确.

•Jan 1, 2007•0 citations

Dirac states for unit position and momentum: Phase consistency of their angular momentum representations

Robert F. Snider

It is shown that the position and momentum directional representations of angular momentum states must satisfy Σλs〈r̂‖λs〉〈λs‖p̂〉 = Σλs(i)λYλs(r̂)Yλs(p̂)*. This imposes phase constraints on the relation between 〈r̂‖λs〉, 〈p̂‖λs〉, Yλs(r̂), and Yλs(p̂). In the accompanying paper, it is shown that this resolves a problem in the centrifugal sudden approximation of molecular collision theory.

The Journal of Chemical Physics•Apr 1, 1982•7 citations

耗散腔中运动辅助量子电池的能量保存

REN Tian-Xi, Yan CHEN, Jia Min Tan +2 more

作为量子领域的潜在能源供给系统，量子电池不可避免地经历由环境退相干诱导的提取功衰变过程。为了抑制能量耗散，本文提出了一种运动原子电池方案，其中原子所在的耗散腔与结构化环境发生耦合作用。本文通过开放量子系统方法，研究了量子电池最大提取功的动力学特性。我们发现，在非马尔可夫环境中，量子电池提取功的衰减显著减缓。相比于静止状态，当量子电池处于运动状态时，量子电池的存储性能得到了提升。这种能量保存效应在较高运动速度下更加显著。当环境记忆效应与运动控制同时作用时，两者有助于延长量子电池的放电寿命。此外，我们还研究了环境温度、随机噪声以及量子纠缠的影响。这些结论为开放量子电池提供了一种可行方案。

Chinese Optics•Jan 1, 2025•0 citations

Supporting material and practice exercises

Navinder Singh

First prove that fµν(−ω) = fνµ(ω). To see this consider φµν(t) =∫ β 0 dλ〈Jν(−i~λ)Jµ(t)〉 or φµν(−t) = ∫ β 0 dλ〈Jν(−i~λ)Jµ(−t)〉 = ∫ β 0 dλtr(Jµ(−t)e−βHJν(−i~λ)) = dλtr(e−iHt/~Jµ(0)e−βH+λHJν(0)e−λH), (8.1) where the cyclic property of the trace operation is used, further, the inte- grand can be written as tr(e−βHe(β−λ)HJµ(0)e−(β−λ)HeiHt/~Jν(0)e−iHt/~) or 〈Jµ(−i~(β − λ))Jν(t)〉. Thus, φµν (−t) = ∫ β 0 dλ〈Jµ(−i~(β − λ))Jν(t)〉. (8.2) Shift the integration variable from λ to λ′ = β − λ φµν(−t) = ∫ β 0 dλ′〈Jµ(−i~λ)Jν(t)〉 = φνµ(t). (8.3) Now, in the definition of the Fourier transform of the response function (Equa- tion (3.53)) change ω to −ω and then shift the integration variable from t to −t fµν(−ω) = ∫ +∞ −∞ dtφµν(−t)eiωt = ∫ +∞ −∞ dtφνµ(t)e iωt = fνµ(ω). QED.

CRC Press eBooks•Nov 17, 2016•0 citations

Haldane Gap and the Spin 1 Antiferromagnetic Integrable Model

Kazuo Saitoh, Satoshi Takada, Kenn Kubo

We have studied the Spin 1 antiferromagnetic chain with both bilinear and biquadratic exchange interactions. The spin correlations have been calculated by means of the transfer matrix method based on the Trotter formula. The mass gap ( m (0)) at the ground state has been investigated as a function of the ratio λ between bilinear and biquadratic interactions. The result suggests that the gapless ground state persists in a finite range of λ, i.e., λ c < λ< λ 1 , with λ c = 0.5 and λ 1 > 1 which is consistent with the exact solution at the completely integrable point (λ= 1). The calculated mass gap ( m (0)) has been fitted to a Kosterlitz-Thouless (KT)-type for λ< λ c ( m (0)= A exp [- B /(λ c - λ) σ ]) producing the results σ= 0.49±0.04 and λ c =0.49±0.03.

Journal of the Physical Society of Japan•Nov 15, 1987•13 citations

运用“部分受激拉曼绝热通道”制备串行Λ系统相干叠加态

李奇芳, 旷冶, 舒晓琴 +1 more

讨论了在串行Λ系统中制备初态和末态的连续叠加态的方法,这种方法是部分受激拉曼绝热通道的扩充.但是它又不同于部分受激拉曼绝热通道,每个斯托克斯脉冲先行相应的泵浦脉冲,但是所有的中间脉冲提前并且同时消失,而第一束斯托克斯脉冲和最后一束泵浦脉冲稍后同时消失.应用数值方法讨论了脉冲驰豫时间和失谐量对该方法的影响.数值结果表明要制备任意的叠加态,不仅要满足双光子共振,而且要满足单光子共振.

原子与分子物理学报•Jan 1, 2008•0 citations
提出一种利用绝热过程实现量子信息转移的方案.Λ型原子和经典场、单模腔场发生相互作用,系统的绝热演化在暗态中进行.利用这种绝热演化可实现Λ型原子间的所有量子信息的转移.用相似的方法还可实现腔场间的量子信息转移.本方案可有效地抑制原子的自发辐射,成功地实现量子信息转移.
作为量子领域的潜在能源供给系统，量子电池不可避免地经历由环境退相干诱导的提取功衰变过程。为了抑制能量耗散，本文提出了一种运动原子电池方案，其中原子所在的耗散腔与结构化环境发生耦合作用。本文通过开放量子系统方法，研究了量子电池最大提取功的动力学特性。我们发现，在非马尔可夫环境中，量子电池提取功的衰减显著减缓。相比于静止状态，当量子电池处于运动状态时，量子电池的存储性能得到了提升。这种能量保存效应在较高运动速度下更加显著。当环境记忆效应与运动控制同时作用时，两者有助于延长量子电池的放电寿命。此外，我们还研究了环境温度、随机噪声以及量子纠缠的影响。这些结论为开放量子电池提供了一种可行方案。
First prove that fµν(−ω) = fνµ(ω). To see this consider φµν(t) =∫ β 0 dλ〈Jν(−i~λ)Jµ(t)〉 or φµν(−t) = ∫ β 0 dλ〈Jν(−i~λ)Jµ(−t)〉 = ∫ β 0 dλtr(Jµ(−t)e−βHJν(−i~λ)) = dλtr(e−iHt/~Jµ(0)e−βH+λHJν(0)e−λH), (8.1) where the cyclic property of the trace operation is used, further, the inte- grand can be written as tr(e−βHe(β−λ)HJµ(0)e−(β−λ)HeiHt/~Jν(0)e−iHt/~) or 〈Jµ(−i~(β − λ))Jν(t)〉. Thus, φµν (−t) = ∫ β 0 dλ〈Jµ(−i~(β − λ))Jν(t)〉. (8.2) Shift the integration variable from λ to λ′ = β − λ φµν(−t) = ∫ β 0 dλ′〈Jµ(−i~λ)Jν(t)〉 = φνµ(t). (8.3) Now, in the definition of the Fourier transform of the response function (Equa- tion (3.53)) change ω to −ω and then shift the integration variable from t to −t fµν(−ω) = ∫ +∞ −∞ dtφµν(−t)eiωt = ∫ +∞ −∞ dtφνµ(t)e iωt = fνµ(ω). QED.
We have studied the Spin 1 antiferromagnetic chain with both bilinear and biquadratic exchange interactions. The spin correlations have been calculated by means of the transfer matrix method based on the Trotter formula. The mass gap ( m (0)) at the ground state has been investigated as a function of the ratio λ between bilinear and biquadratic interactions. The result suggests that the gapless ground state persists in a finite range of λ, i.e., λ c < λ< λ 1 , with λ c = 0.5 and λ 1 > 1 which is consistent with the exact solution at the completely integrable point (λ= 1). The calculated mass gap ( m (0)) has been fitted to a Kosterlitz-Thouless (KT)-type for λ< λ c ( m (0)= A exp [- B /(λ c - λ) σ ]) producing the results σ= 0.49±0.04 and λ c =0.49±0.03.
讨论了在串行Λ系统中制备初态和末态的连续叠加态的方法,这种方法是部分受激拉曼绝热通道的扩充.但是它又不同于部分受激拉曼绝热通道,每个斯托克斯脉冲先行相应的泵浦脉冲,但是所有的中间脉冲提前并且同时消失,而第一束斯托克斯脉冲和最后一束泵浦脉冲稍后同时消失.应用数值方法讨论了脉冲驰豫时间和失谐量对该方法的影响.数值结果表明要制备任意的叠加态,不仅要满足双光子共振,而且要满足单光子共振.