量子门

它们都达到了有效缩短了脉冲所用的时间，提高了量子门的保真度的效果。

They both effectively shorten the pulse time and improve the fidelity of quantum gate .

理论上，一个纯几何相量子门可以由绝热几何相位来实现。

Theoretically , a pure geometric phase quantum gate can be achieved based on adiabatic geometric phase .

基于一般的SU（2）循环演化条件，还构造了只依赖轨道的绕数和扭结数的普适拓扑量子门。

Based on the cyclic condition of general evolution , the universal topological gates are constructed only by the winding number and knot number .

为了解决这个问题，AA相被用来实现几何量子门，研究发现，用它实现的量子门拥有较快的门运算时间和几何相位的内在几何特性。

To solve this problem , AA phase was suggested to complete geometric quantum gates . These gates have the faster gate-operation time and intrinsic geometric features of the geometric phase .

任意量子门都可以由二比特控制非门（CN门）和单比特旋转门（R门）组成。因此，人们致力于研究如何实现CN门和R门。

Since any logic gate can be constructed by two-qubit controlled not gates ( CN gate ) and one qubit rotation gate ( R gate ), the realization of the CN and R gates has been studied extensively .

首先比较了带量子门更新和群体灾变的量子算法（QA）以及加入对量子位的交叉和变异操作的量子遗传算法（QGA）；

Quantum algorithm ( QA ) with updating of quantum gates and catastrophe of population is compared with quantum genetic algorithm ( QGA ) by including crossover and mutation for quantum bits .

NQGA采用量子门旋转角更新新方法和增强算法寻优能力及防止早熟收敛的移民和灾变策略。

NQGA adopted a novel update approach of rotation angles of quantum gates , and immigration and catastrophe operations to enhance search capability and to avoid premature convergence .

利用通用量子门实现多用途量子克隆机的方案。

Use the quantum logic gate for implementing multi-purpose quantum cloning machine .

激光场的经典极限条件及其在量子门中的应用

The classical limit condition of laser field and its application in quantum gates

量子门操作是描述量子态演化的幺正算子。

Quantum gates are unitary operations used to describe the evolution of quantum states .

在文章最后介绍了实验中实现量子门和量子逻辑电路的一些方法。

At the end , we introduced some means in experimentations to realize quantum gates and quantum logic circuits .

等的螺旋光纤实验.还提出用简单二能级系统构造拓扑量子门的方案，并用前面同样的2个二能级系统构造了几种基本的拓扑量子门。

, also proposes a scheme of constructing topologic gates and illustrates these gates still with above two two-level systems .

在这个基础上，我们就构造出了一组通用量子门，从而实现长程量子计算的目的。

Thus , a set of universal quantum logic gates can be set up to realize quantum computation in long distance .

但是在多循环方案中不能直接用磁场来实现量子门，而需要用到旋转场的方法来调整循环初态。

But the gates may not be practical by using the magnetic field and need rotate the field to adjust the cyclical initial states .

该仿真平台包括量子门电路的设计仿真模块、量子密钥分配仿真模块、效果演示模块，可用于量子密钥通信和量子密钥算法改进的综合仿真。

This simulation platform includes the design of quantum gate circuit simulation module , quantum key distribution simulation module and the effect of presentation modules .

在实现量子门的过程中，约瑟夫森结系统一直处于虚激发的状态，其快速的退相干速率对量子门保真度的影响得到了很好的抑制。

The Josephson junction sys-tem is only virtually excited during the proceeding of quantum gate operations , thus its rapid decay and decoherence rates have limited influences on the quantum gate .

其中几何相因为只依赖于演化路径的整体几何特性，被认为可以有效对抗操作过程中的无规噪声，这一点对于构建内秉容错的量子门方案意义重大。

The geometric phase depends only on the global feature of the evolution path and is believed to be robust against local fluctuations . It seems helpful to achieve built-in fault-tolerant quantum gates .

该方法引入免疫记忆克隆策略，增强了算法的局部搜索能力。同时，还采用动态调整量子门旋转角步长机制和量子交叉操作，进一步提高了算法的搜索性能。

This method introduces immune memory clonal strategy to enhance the local search capacity of the algorithm , and further improves the search efficiency of the algorithm by using dynamic step length in adjustment of rotation angle of quantum gates mechanism and quantum cross operator .

用基本的两位量子逻辑门实现n位量子逻辑门的功能

Two-bit Quantum Gates to Implement N-bit Quantum Gates

不对称耦合对量子CCN门精度的影响

Effects of Non-uniform Interactions on the Fidelity of a Quantum Controlled-controlled-not gate close coupled

本文第一章介绍了量子逻辑门，第二章介绍了量子C-NOT门的构成及运行，第三章和第四章是具体的研究工作。

Within this context , the first chapter indicates quantum logic gate and the second chapter demonstrates composing and running of the quantum C-NOT gate .

实验上通过级联的量子逻辑门来构造量子计算机。

Quantum computer is formed through combination of quantum logic gates .

该编码既适用于量子逻辑门的防错和纠错，也适用于防止量子计算机存储单元的解相干。

It is useful for quantum logic gate and quantum computer memory .

提出了基于混沌序列和量子逻辑门组的加密算法。

The quantum logic gates encryption algorithm based on chaos sequence are proposed .

核磁共振实现基本量子逻辑门和量子分立付里叶变换

The Realization of Basic Quantum Logical Gate and Discrete Fourier Transformation with NMR

用腔场中的二能级势阱离子实现量子逻辑门

Implementation of Quantum Logic Gates Using a Two-level Trapped Ion in Cavity QED

量子逻辑门核磁共振实验的仿真实现

Simulation of NMR Experiment for Quantum Logic Gates

介观电路中量子逻辑门的研究

Research on Quantum Logic Gates in Mesoscopic Circuits

也就是说，量子逻辑门是量子计算过程中的基本单元。

That is to say , quantum gate is a fundamental unit of quantum computation .

接着通过引入一个辅助的原子系综，我们又提出了实现量子交换门方案。

Next , we propose a scheme to realize quantum swap gate with auxiliary atomic ensemble .