Transfer of coherence from atoms to mixed field states in a two-photon lossless micromaser

Diffusive lossless energy and coherence transfer by noisy coupling

Here we show that noisy coupling can lead to diffusive lossless energy transfer between individual quantum systems retaining a quantum character leading to entangled stationary states. Coherence might flow diffusively while being summarily preserved even when energy exchange is absent. Diffusive dynamics persists even in the case when additional noise suppresses all the unitary excitation exchange: arbitrarily strong local dephasing, while destroying quantum correlations, is not affecting energy transfer.

The influence of dipole-dipole interaction on entanglement in nondegenerate two-photon Tavis-Cummings model with atomic coherence

The entanglement of two dipole-coupled atoms with nondegenerate two-photon transitions interacting with two-mode field in lossless cavity has been investigated. It shows that the entanglement is dependent on the initial atomic states. The possibility of considerable growth of atomic entanglement due atomic coherence and dipole-dipole interaction is shown in the case of great mean values of thermal photons.

近无损方法生成热光子聚光光束

Near-lossless method for generating thermal photon-bunched light

本研究提出了一种低损耗方法，实现高转换效率的光子聚束生成，显著提升热光源在传感应用中的性能。

Qubit transfer between photons at telecom and visible wavelengths in a slow-light atomic medium

We propose a method that enables efficient conversion of quantum information frequency between different regions of spectrum of light based on recently demonstrated strong parametric coupling between two narrow-band single-photon pulses propagating in a slow-light atomic medium [1]. We show that an input qubit at telecom wavelength is transformed into another at visible domain in a lossless and shape-conserving manner while keeping the initial quantum coherence and entanglement. These transformations can be realized with a quantum efficiency close to its maximum value.

基于体积积分方程方法的介电体远场量子相干建模

Modeling of Far-Field Quantum Coherence by Dielectric Bodies Based on the Volume Integral Equation Method

本文提出一种统一的理论-数值框架，用于计算任意无损耗介电散射体的远场双光子相关函数和时域重合计数，通过多通道散射公式实现双入射通道到双远场检测模式的映射，揭示量子干涉的强角依赖性及其对HOM凹陷可见度的直接影响。

Entanglement-preserving frequency conversion in cold atoms

We propose a method that enables efficient frequency conversion of quantum information based on recently demonstrated strong parametric coupling between two single-photon pulses propagating in a slow-light atomic medium at different group velocities. We show that an incoming single-photon state is efficiently converted into another optical mode in a lossless and shape-conserving manner. The persistence of initial quantum coherence and entanglement within frequency conversion is also demonstrated. We first illustrate this result for the case of small frequency difference of converted photons, a…

Entanglement between two qubits one of which interacts with a thermal field

In this paper, we have investigated the entanglement between two dipole coupled two-level atoms. The model, in which only one atom is trapped in an lossless cavity and interacts with single-mode thermal field, and the other one can be spatially moved freely outside the cavity has been carried out. We have considered the effect of the atomic coherence on the entanglement behavior. We have shown that a thermal field might cause high entanglement between the atoms both for coherent and incoherent initial atomic states only for small values of the cavity mean photon number. In the considered model…

宽频连续波参量下转换源中的高增益效应及未探测光子的测量

High-gain effects in broadband continuous-wave parametric down conversion sources and measurements with undetected photons

研究宽频连续波参量下转换源中高增益效应及未探测光子测量的干涉仪配置与实验结果。