A folded-sandwich polarization-entangled two-color photon pair source with large tuning capability for applications in hybrid quantum architectures

紧凑且稳定的极化纠缠光子对源基于折叠的线性位移干涉仪

Compact and stable source of polarization-entangled photon-pairs based on a folded linear displacement interferometer

基于折叠线性位移干涉仪的紧凑稳定极化纠缠光子对源，利用自发参量下转换实现高保真度和高效率的量子通信应用。

Preserving entanglement under decoherence and sandwiching all separable states

Every entangled state can be perturbed, for instance by decoherence, and stay entangled. For a large class of pure entangled states, we show how large the perturbation can be. Our class includes all pure bipartite and all maximally entangled states. For an entangled state, E, the constucted neighborhood of entangled states is the region outside two parallel hyperplanes, which sandwich the set of all separable states. The states for which these neighborhoods are largest are the maximally entangled ones. As the number of particles, or the dimensions of the Hilbert spaces for two of the particles…

Phase-stable source of polarization-entangled photons in a linear double-pass configuration

We demonstrate a compact, robust, and highly efficient source of polarization-entangled photons, based on linear bi-directional down-conversion in a novel 'folded sandwich' configuration. Bi-directionally pumping a single periodically poled KTiOPO$_4$ (ppKTP) crystal with a 405-nm laser diode, we generate entangled photon pairs at the non-degenerate wavelengths 784 nm (signal) and 839 nm (idler), and achieve an unprecedented detection rate of 11.8 kcps for 10.4 $μ$W of pump power (1.1 million pairs / mW), in a 2.9-nm bandwidth, while maintaining a very high two-photon entanglement quality, wit…

通过纠缠光子对的偏振基投影对局域随机性与非局域关联进行相干性分析

Coherence analysis of local randomness and nonlocal correlation through polarization-basis projections of entangled photon pairs

本文通过偏振基投影对纠缠光子对的局域随机性和非局域关联进行相干性分析，揭示相位信息在量子特性中的确定性作用。

在光子拓扑绝缘体中操控多种光学参量过程

Manipulating multiple optical parametric processes in photonic topological insulators

本文提出在模拟量子谷霍尔效应的光子拓扑绝缘体中，利用两种拓扑边缘模式和四波混频实现光学参量放大、分频及频率纠缠双光子产生，并展示其拓扑保护鲁棒性。

Manipulation of a two-photon pump in superconductor - semiconductor heterostructures

We investigate the photon statistics, entanglement and squeezing of a pn-junction sandwiched between two superconducting leads, and show that such an electrically-driven photon pump generates correlated and entangled pairs of photons. In particular, we demonstrate that the squeezing of the fluctuations in the quadrature amplitudes of the emitted light can be manipulated by changing the relative phase of the order parameters of the superconductors. This reveals how macroscopic coherence of the superconducting state can be used to tailor the properties of a two-photon state.