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借助于共生纠缠度和输入输出保真度考察了初始处于纠缠态的两粒子在联合噪声环境中的消纠缠特性。结果表明：两粒子纠缠态可分为相干保持态和脆弱纠缠态，对于脆弱纠缠态分析了它们在低温条件欧姆型耗散下的纠缠消相干演化动力学。 相似文献
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The random matrices theory is applied to a study of the heat capacity of small metallic grains. The numerical calculations indicate that the level distribution and the difference between the particles respectively with an even and an odd numbers of electrons are important for the heat capacity of the small metallic grains at a low temperature and the level correlation mainly affects the heat capacity at a high temperature. 相似文献
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This paper proposes a method of generating multipartite entanglement through usingd.c. superconducting quantum interference devices (SQUID) inside a standingwave cavity. In this scheme, the d.c. SQUID works in the charge region. Itis shown that, a large number of important multipartite entangled states canbe generated by a controllable interaction between a cavity field andqubits. It is even possible to produce entangled states involving differentcavity modes based on the measurement of charge qubits states. After suchsuperpositions states are created, the interaction can be switched off bythe classical magnetic field through the SQUID, and there is no informationtransfer between the cavity field and the charge qubits. 相似文献
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利用隶玻色子平均场近似理论,并借助于单杂质的Anderson模型的哈密顿量,研究了T型耦合双量子点嵌入正常电极的基态输运性质.结果表明：在体系处于平衡状态时,随着双量子点的耦合强度增加,体系的Kondo 效应被削弱. 当耦合强度足够强时,Kondo量子点态密度的Kondo共振单峰分裂成两个不对等的Kondo共振双峰.在体系处于非平衡状态时,增加两电极的偏压,态密度的Kondo分裂的非对等性明显加强. 关键词：Kondo效应态密度格林函数法耦合双量子点 相似文献
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Fano Interference versus Kondo Effect in Strongly Correlated T-Shaped Quantum Dots Embedded in an Aharonov-Bohm Ring 
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下载免费PDF全文 We theoretically investigate the properties of the ground state of the strongly correlated T-shaped double quantum dots embedded in an Aharonov-Bohm ring in the Kondo regime by means of the one-impurity Anderson Hamiltonian. It is found that in this system, the persistent current depends sensitively on the parity and size of the ring. With the increase of interdot coupling, the persistent current is suppressed due to the enhancing Fano interference weakening the Kondo effect. Moreover, when the spin of quantum dot embedded in the Aharonov- Bohm ring is screened, the persistent current peak is not affected by interdot coupling. Thus this model may be a new candidate for detecting Kondo screening cloud. 相似文献
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This paper proposes a simple scheme for realizing one-qubit andtwo-qubit quantum gates as well as multiqubit entanglement based ondc-SQUID charge qubits through the control of their coupling to a 1Dtransmission line resonator (TLR). The TLR behaves effectively as aquantum data-bus mode of a harmonic oscillator, which has severalpractical advantages including strong coupling strength,reproducibility, immunity to 1/f noise, and suppressed spontaneousemission. In this protocol, the data-bus does not need to stayadiabatically in its ground state, which results in not only fastquantum operation, but also high-fidelity quantum informationprocessing. Also, it elaborates the transfer process with the 1Dtransmission line. 相似文献
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