Entanglement generation and protection by detuning modulation

Generation of Photon Pairs in Dispersion Shift Fibers through Spontaneous Four Wave Mixing: Influence of Self-phase Modulation

Correlated signal and idler photon pairs with small detuning in the telecom band can be generated through spontaneous four-wave mixing in dispersion shift fibers. However, photons originated from other nonlinear processes in optical fibers, such as Raman scattering and self-phase modulation, may contaminate the photon pairs. It has been proved that photons produced by Raman scattering are the background noise of photon pairs. Here we show that photons induced by self-phase modulation of pump pulses are another origin of background noise. After studying the dependence of self-phase modulation i…

产生三光子拉比振荡无需大失谐条件

Generating three-photon Rabi oscillations without a large-detuning condition

本文提出利用可调跃迁频率的人造原子，在无需三分之一频率失谐条件下产生三光子拉比振荡，通过有效哈密顿量实现小失谐区域共振，并具有可探测光子输出，可用于福克态源和多粒子纠缠生成。

Protection of entanglement between two two-level atoms

The dynamical evolution of entanglement between two polarizable two-level atoms in weak interaction with electromagnetic vacuum fluctuations is investigated. We find that, for initial Bell state $ψ^{\pm}$, the decay rate of entanglement between atoms is just the superradiant spontaneous emission rate, which depends not only on the spontaneous emission rate of atom but also on the modulation of the spontaneous emission rate due to the presence of another atom. It is shown that, with the presence of a boundary, the entanglement between transversely polarizable atoms can be protected for a very l…

开放量子系统中共振主导的光机械纠缠

Resonance-dominant optomechanical entanglement in open quantum systems

提出一种共振滤波模型，通过消除热机械模式与热浴间显著失谐分量来抵抗退相干，使稳态最大光机械纠缠的鲁棒性提升一倍，并推广至光学腔阵列的长距离纠缠转移。

Generation and protection of Maximally Entangled State between many modes in an optical network with dissipation

We present a three-cavity network model with two modes in each cavity and a non-linear medium that generates a Kerr type interaction via both self-phase and cross-phase modulation processes. We have two main goals. The first one is to generate a multipartite Maximally Entangled State (MES), starting from the ground state of the system. We address the problem both without and with dissipation. Secondly, we want to protect the MES from decoherence. While studying the MES, we analyze different bipartite and multipartite entanglement measures. We also study the effect of an Avoided Level Crossing …

有限记忆结构储层中可分压缩态的纠缠动力学

Entanglement Dynamics of Separable Squeezed States in Finite Memory Structured Reservoir

研究两个可分离压缩真空态玻色子模式在共同结构储层中的纠缠动力学，通过非马尔可夫量子态扩散和伪模嵌入等方法，发现了三种马尔可夫动力学中不存在的纠缠机制：失谐冻结、正交输入的纠缠生灭与复兴、以及周期失谐产生的整数锁定方波振荡。

通过动力学约束与时间调制实现 Rydberg 原子阵列中的定向输运

Directional Transport in Rydberg Atom Arrays via Kinetic Constraints and Temporal Modulation

本文提出利用距离相关的 Rydberg 相互作用和时间调制激光失谐，在不等间距原子阵列中无局域寻址地实现 Rydberg 激发与 Bell 对的稳健、相干定向输运。

Speeding up adiabatic passage with an optimal modified Roland-Cerf protocol

In this article we propose a novel method to accelerate adiabatic passage in a two-level system with only longitudinal field (detuning) control, while the transverse field is kept constant. The suggested method is a modification of the Roland-Cerf protocol, during which the parameter quantifying local adiabaticity is held constant. Here, we show that with a simple ``on-off" modulation of this local adiabaticity parameter, a perfect adiabatic passage can be obtained for every duration larger than the lower bound $π/Ω$, where $Ω$ is the constant transverse field. For a fixed maximum amplitude of…

Rydberg原子系统中的准周期Floquet-Gibbs态

Quasiperiodic Floquet-Gibbs states in Rydberg atomic systems

基于Fermi黄金定则，论证了在周期调制的Rydberg原子系统中自然涌现Floquet-Gibbs态，并数值验证其与Redfield方程稳态基本一致。