量子信道特别是量子高斯信道容量具有重要的信息论意义。
We study information capacities of quantum channels with special emphasis on quantum Gaussion channels.
量子信道中不可避免存在的噪声将扭曲被传输的信息，对通信造成危害。
Noise that unavoidably exists in the quantum channel will distort transmitted information and destroy the communication.
在此方案中，用一个三粒子纠缠态作为量子信道，传送两比特未知原子态。
In this scheme, a three-particle entangled state is used as quantum channel to teleport a two-qubit atomic state.
虽然选用了不同的量子信道，但同样可以实现任意三粒子态的概率隐形传输。
Although choosing different quantum channel, we also may realize teleportation of an arbitrary three-particle state.
运用量子熵理论，引入量子无噪声编码方法，并研究了量子信道中的信息容量问题。
The quantum noiseless coding method is discussed with the quantum entropy theory, and the capacity of quantum channel.
它在量子通信网络的发信者与收信者之间建立光子链路，为通信双方提供量子信道，用于传输量子信息。
It builds the photon link between sender and receiver of quantum communication network, and provides quantum channel for transferring quantum information between them.
在这个纠缠转移的方案里，通讯伙伴之间使用的量子信道是由两个振幅相同位相相反的相干态构成的纠缠态。
In this scheme, the entanglement between two coherent states, and , with the same amplitude but a phase difference is utilized as the quantum channel.
本文研究光纤作为量子信道在密波分复用时模式间非线性干扰造成的信道噪声的性质，和光纤量子信道在该噪声下的经典容量。
In this paper we investigate the noise properties and classical capacity of an optical fiber which is considered as a quantum channel.
与最近的基于四光子避错码的克服量子信道噪声的量子密钥分发方案相比，该方案的量子比特效率提高了16.67%，密钥分发安全性是它的3.5倍。
Compared with the recent QKD scheme based on four-photon QEAC, the qubit efficiency of the authors' scheme increases by 16.67%, and the security is 3.5 times of it.
因此研究湍流大气信道对量子密钥分布系统性能的影响就非常重要。
So it is important to analyze the effect of turbulent atmosphere channel on quantum key distribution systems.
用位移算符方法计算量子噪声的累加，同时建立了有衰减和噪声时的信道的量子模型。
With displacement operator method the total quantum noise is obtained, and a quantum channel model with attenuation and noise is proposed.
讨论了光子与大气的相互作用，利用量子计算语言对大气信道中的量子密钥分配进行了仿真。
We discussed the interaction between a photon and the atmosphere, and simulated the quantum key distribution protocol between atmospheric channels using the quantum computation language.
本文通过引入量子测量信道的概念，并参照经典通信模型，首次为量子密钥分配建立了通信模型。
In this paper, by analogy to the classic communication model, and by employing notion of the measurement channel, a communication model for quantum key distribution is constructed.
本课题目的是在理论上研究基于有噪声和损耗信道的量子网络通信。
The aim of this project is to investigate quantum direct communication network models based on a channel with noise and loss.
通常的量子密钥分配协议都需要一个辅助的经典信道来生成量子密钥。
In previous quantum key distribution protocols a auxiliary classical channel is needed.
在量子系统中，信道噪声主要源于消相干效应和量子门的不精确性。
In quantum system, noise primary results from decoherence and imperfect quantum gates.
在给出量子分发信道时分复用方案和量子交换机方案的基础上，提出了量子时分多用户通信方案及通信协议。
Based on the quantum channel time division multiplexing scheme and the quantum switch scheme, a quantum time division multiuser communication scheme and communication protocol are proposed.
将量子避错码思想用于量子密钥分发，能有效克服信道中的噪声，且无需复杂的系统。
The quantum key distribution (QKD) using the QEAC will be robust in the quantum noisy channel without complex system.
将量子避错码思想用于量子密钥分发，能有效克服信道中的噪声，且无需复杂的系统。
The quantum key distribution (QKD) using the QEAC will be robust in the quantum noisy channel without complex system.
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