Entangled state based on nonorthogonal state

Entangled Nonorthogonal States and Their Decoherence Properties

This paper presents properties of the so-called quasi-Bell states: entangled states written as superpositions of nonorthogonal states. It is shown that a special class of those states, namely entangled coherent states, are more robust against decoherence due to photon absorption than the standard bi-photon Bell states.

损耗型非正交准模中纠缠压缩态的非线性光学产生：一种解析解

Nonlinear optical generation of entangled squeezed states in lossy nonorthogonal quasimodes: an analytic solution

本研究推导得出纳米腔损耗非正交准模下非线性光量子态密度算符的多模压缩热态解析形式，通过耦合微分方程描述参数时变特性，在双准模系统中验证了与模拟的一致性，为混合高斯簇态的高效建模优化提供了新方法。

Maximal entanglement of nonorthogonal states: classification

A necessary and sufficient condition for the maximal entanglement of bipartite nonorthogonal pure states is found. The condition is applied to the maximal entanglement of coherent states. Some new classes of maximally entangled coherent states are explicited constructed; their limits give rise to maximally entangled Bell-like states.

Bipartite maximally entangled nonorthorgonal states

We give conditions under which general bipartite entangled nonorthogonal states become maximally entangled states. By the conditions we construct a large class of entangled nonorthogonal states with exact one ebit of entanglement in both bipartite and multipartite systems. One remarkable property is that the amount of entanglement in this class of states is independent on the parameters involved in the states. Finally we discuss how to generate the bipartite maximally entangled nonorthogonal states.

光谱纠缠光子中的非正交编码

Nonorthogonal coding in spectrally-entangled photons

本研究针对安全量子通信需求，提出在原子系综产生的多路复用光谱纠缠光子对中实现非正交编码及多通道架构，经二阶关联等量化验证其编解码能力优于正交编码，可支撑大规模多用户量子通信。

Entanglement of genuinely entangled subspaces and states: exact, approximate, and numerical results

Genuinely entangled subspaces (GESs) are those subspaces of multipartite Hilbert spaces that consist only of genuinely multiparty entangled pure states. They are natural generalizations of the well-known notion of completely entangled subspaces , which by definition are void of fully product vectors. Entangled subspaces are an important tool of quantum information theory as they directly lead to constructions of entangled states, since any state supported on such a subspace is automatically entangled. Moreover, they have also proven useful in the area of quantum error correction. In our recent…