共查询到19条相似文献,搜索用时 515 毫秒
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无耗散耦合介观电路的能谱及量子电流 总被引:11,自引:1,他引:10
基于电荷的不连续性,对无耗散介观耦合电路进行量子化,在无相互作用Hamilton本征态基矢下给出介观电路的能谱关系;在电荷空间中,假设系统具有变换的对称性,通过求解电流本征值方程,研究和分析了介观电路中量子电流的性质。结果表明,电路能谱及其量子回路电流不仅与电路参数有关,而且明显地依赖于电荷的量子性质。 相似文献
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电感耦合介观电路的量子回路方程及其能谱 总被引:8,自引:3,他引:8
基于电荷的离散性量子化电感耦合介观电路,给出耦合形式的量子回路方程,以及电感耦合介观电路的能谱关系式.结果表明,计及电荷具有不连续性的事实将使量子回路方程的形式变得复杂;电感耦合介观电路的能谱除与电路参数相关外,还明显地依赖于电荷的量子化性质以及电路的相位角参量. 相似文献
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介观耦合电路量子涨落与温度的关系 总被引:11,自引:4,他引:7
由于电流在电路中运动会产生焦耳热,因而介观电路总是工作在有限的温度下。本文讨论有限温度下介观耦合电路的量子效应,结果表明电荷和电流的量子涨落的温度有关。 相似文献
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介观RLC电路在热相干态和热压缩态下的量子涨落 总被引:8,自引:3,他引:5
利用热场动力学的方法研究了介观RLC电路在有限温度下的相干态和压缩态中电荷和磁通量的量子涨落.结果表明,介观RLC电路中电荷和磁通量的量子涨落不仅与电路中的元件参数而且可能与环境温度和压缩参数有关,而这些量子涨落与平移参数无关. 相似文献
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数-相量子化及介观电路在自由热态下的量子效应 总被引:2,自引:2,他引:0
利用数-相量子化方案,将介观LC电路等效为一个谐振子.通过相干态表象和算符正规乘积形式,简捷地给出了自由热态的Wigner函数,同时借助于量子算符及其Weyl-Wigner对应研究了体系中电荷数及相位差在自由热态下的量子效应.结果表明,体系中电荷数及相位差在自由热态下的量子涨落不仅和电路中器件的参数有关,而且还和温度有关,且储存于电感中的平均能量和电容中的平均能量分别相等.这一研究结果支持了介观电路数-相量子化新方案,对介观电路的量子化和电路的量子效应的研究具有很好的理论指导意义. 相似文献
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量子位叠加态的防错纠错编码 总被引:10,自引:2,他引:8
提出用单个量子位的叠加态进行量子编码,采用分组纠错方法,设置纠错量子线路;用8个量子们编码时,建立同态量子位对模型,简化了量子编码。 相似文献
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Jacob D. Biamonte Jeff S. Allen Marek A. Perkowski 《Journal of Electronic Testing》2010,26(5):499-511
In classical test and verification one develops a test set separating a correct circuit from a circuit containing any considered
fault. Classical faults are modelled at the logical level by fault models that act on classical states. The stuck fault model,
thought of as a lead connected to a power rail or to a ground, is most typically considered. A classical test set complete
for the stuck fault model propagates both binary basis states, 0 and 1, through all nodes in a network and is known to detect
many physical faults. A classical test set complete for the stuck fault model allows all circuit nodes to be completely tested
and verifies the function of many gates. It is natural to ask if one may adapt any of the known classical methods to test
quantum circuits. Of course, classical fault models do not capture all the logical failures found in quantum circuits. The
first obstacle faced when using methods from classical test is developing a set of realistic quantum-logical fault models
(a question which we address, but will likely remain largely open until the advent of the first quantum computer). Developing
fault models to abstract the test problem away from the device level motivated our study. Several results are established.
First, we describe typical modes of failure present in the physical design of quantum circuits. From this we develop fault
models for quantum binary quantum circuits that enable testing at the logical level. The application of these fault models
is shown by adapting the classical test set generation technique known as constructing a fault table to generate quantum test
sets. A test set developed using this method will detect each of the considered faults. 相似文献
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《IEEE transactions on circuits and systems. I, Regular papers》2005,52(8):1590-1596
A quantum computer simulator is presented. This simulator is an engineering work and no deep understanding of quantum mechanics is required from the user. The simulator is based on the circuit model of quantum computation in which quantum gates act on quantum registers which comprise a number of quantum bits (qubits). The inputs to the simulator are the initial states of the qubits that form a quantum register and the quantum gates applied at each computation step. The inputs are entered through a graphical user interface. The outputs of the simulator are the matrices that represent the quantum register state at each quantum computation step and graphical outputs that show the probability of measuring each one of the possible quantum register base states and the phase of each state at each computation step. The well-known Deutsch's algorithm and the quantum Fourier transform, which is the base of many quantum algorithms, are presented using this simulator. Furthermore, the generation and variation of entanglement during quantum computations can be calculated using this simulator. The quantum computer simulator is a useful tool for the study of quantum computer circuits, quantum computing, and the development of new quantum algorithms. 相似文献
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为了实现N位量子态秘密共享,提出利用四粒子cluster态作为量子信道,cluster态虽然不是最大的纠缠态,但是有比最大纠缠态更强健的性质,通信者Alice通过添加辅助粒子,并对量子态进行五粒子联合测量,Bob(Charlie)对手中的粒子进行单粒子测量,并把结果和恢复量子态需要进行的操作告知Charlie(Bob),Charlie(Bob)按照从Bob(Charlie)处得到的信息对手中的粒子进行相应的操作,最后再根据需要,把量子态通过相应的量子线路得到所需要共享的量子态。安全性分析证明此方案是安全的。 相似文献
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《Applied Superconductivity, IEEE Transactions on》2009,19(1):2-13
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Mizugaki Y. Nakajima K. Sawada Y. Yamashita T. 《Applied Superconductivity, IEEE Transactions on》1994,4(1):1-8
A novel superconducting neuron circuit and two types of variable synapses, which are based on superconducting quantum interferometer devices (SQUIDs), are presented. A neuron circuit with good input-output isolation and steep threshold characteristics is accomplished using a combination of a single-junction SQUID coupled to a double-junction SQUID. The quantum state of the single-junction SQUID represents the neuron state, and the output voltage of the double-junction SQUID, which is operated in a nonlatching mode with shunt resistors, is a sigmoid-shaped function of the input. Both variable synapse circuits are composed of multiple shunted double-junction SQUIDs. The first type changes its conductance value by using both superconducting and voltage states. The second variable synapse circuit changes its output current digitally by switching its bias currents. Besides numerical simulations of the circuit characteristics, we have fabricated superconducting neural chips in a Nb/AlOx/Nb Josephson junction technology. The fundamental operation of each element and a 2-bit neural-based A/D converter have been successfully tested. A learning system with a variable synapse is also discussed 相似文献