光量子态远程制备中的物理问题研究

Photon states become the ideas information carrier for long-distance quantum communication due to its high transmission speed and long transmission distance. Photon states remote preparation and quantum state transmission is one of the central tasks in quantum communication. In this program, we will study remote preparation of single- and multi- photon states and some relevant issues on quantum state remote preparation. We want to study the efficient of single- and multi- photon states remote preparation by simulating quantum channels and analyzing them with theoretic analysis and calculations. We will investigate schemes for quantum state remote preparation and quantum operation remote implementation based on linear-optics elements, study quantum state purification after quantum state remote preparation over noisy quantum channel. We will also study quantum state remote preparation based on generalized measurement, and present simple and feasible scheme for multi- photon states remote preparation via generalized measurement。We will look for efficient schemes for remote preparation of some special some special ensembles of multi-photon states, such as equatorial states, GHZ-class states.Through the project, we will try to provide some optics feasible schemes for schemes via noisy quantum channel and the corresponding quantum state purification methods. The project is expected to be useful in the future long-distance quantum communication and large-scale quantum computation.

光量子态由于具有传输速度快,传输距离远等优点已成为远程量子通信的理想信息载体。光量子态的远程制备和传输是量子通信的重要任务之一。本项目将对光量子态远程制备及其相关问题展开研究,用信道模拟和理论计算分析等手段研究光量子态远程制备效率。研究基于线性光学元件的光量子态远程制备和操作新方法,探索噪声环境下光量子态远程制备后的量子态纯化问题。研究基于广义测量的光量子态远程制备方案，并在此基础上提出实验上易操作的理论方案。针对某些特殊类型的光量子态，如赤道态；类GHZ态设计高效的量子态远程制备方法。通过本项目的研究，争取获得一些光学上容易实现的噪声环境下光量子态远程制备和操控方法以及相应的量子态纯化方法，对远程量子通信和大尺度量子计算有所帮助。

光量子态由于具有传输速度快,传输距离远等优点已成为远程量子通信的理想信息载体。光量子态的远程制备和传输是量子通信的重要任务之一。本项目对光量子态远程制备及其相关问题展开研究,用信道模拟和理论计算分析等手段研究光量子态远程制备效率。研究相位翻转、比特翻转、退极化、幅值阻尼、相位阻尼等量子信道噪声对单光子态远程传送影响，提出了通过纠缠光子旋转提高噪声信道下单量子比特态远程制备保真度方法；基于多光子纠缠信道提出了高效的多光子态联合制备方案。提出了利用线性光学元件对部分纠缠信道重复转化方法，建立了基于部分纠缠信道光量子态远程制备方案。基于信号态与相干态之间的非线性克尔效应，构建了光子系统多个自由度上的量子非破坏性测量，设计了基于双光子超纠缠态的量子操控远程实现方法,同时，讨论了某些特殊量子操控并行远程实现方法。利用基于需制备量子态信息的半正定算子测量提出了基于高维纠缠态的任意高维多粒子态多方可控远程联合制备方案。研究了多光子纠缠态制备方法，以此为基础提出了安全、可行的单光子态多方远程联合操控方法。建立了光学上容易实现的噪声环境下光量子态远程制备、转化与操控方法，对远程量子通信和大尺度量子计算有所帮助。