排序方式: 共有16条查询结果,搜索用时 812 毫秒
1.
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
2.
考虑了奇/偶电子数分布,从配分函数出发,用静态路径近似(SPA)方法和BCS方法计算了随机矩阵理论中高斯正交系综(GOE)所对应的电子能级分布对超导纳米粒子的电子比热的影响,得到了弱自旋-轨道耦合和弱磁场中和奇/偶电子数分布下的电子比热,并做了简单分析.经过计算和分析,发现粒子尺寸和奇/偶电子数对电子比热和转变温度有影响. 相似文献
3.
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
4.
Multipartite entanglement in the interaction system between a single-mode microwave cavity field and superconducting charge qubits
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This paper proposes a method of generating multipartite entanglement through using
d.c. superconducting quantum interference devices (SQUID) inside a standing
wave cavity. In this scheme, the d.c. SQUID works in the charge region. It
is shown that, a large number of important multipartite entangled states can
be generated by a controllable interaction between a cavity field and
qubits. It is even possible to produce entangled states involving different
cavity modes based on the measurement of charge qubits states. After such
superpositions states are created, the interaction can be switched off by
the classical magnetic field through the SQUID, and there is no information
transfer between the cavity field and the charge qubits. 相似文献
5.
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
6.
7.
Scheme for realizing quantum computation and quantum information transfer with superconducting qubits coupling to a 1D transmission line resonator
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This paper proposes a simple scheme for realizing one-qubit and
two-qubit quantum gates as well as multiqubit entanglement based on
dc-SQUID charge qubits through the control of their coupling to a 1D
transmission line resonator (TLR). The TLR behaves effectively as a
quantum data-bus mode of a harmonic oscillator, which has several
practical advantages including strong coupling strength,
reproducibility, immunity to 1/f noise, and suppressed spontaneous
emission. In this protocol, the data-bus does not need to stay
adiabatically in its ground state, which results in not only fast
quantum operation, but also high-fidelity quantum information
processing. Also, it elaborates the transfer process with the 1D
transmission line. 相似文献
8.
9.
Fano Interference versus Kondo Effect in Strongly Correlated T-Shaped Quantum Dots Embedded in an Aharonov-Bohm Ring
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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
10.
从约化BCS哈密顿量出发.采用配分函数的路径积分表示方法,在静态路径近似(SPA)方法下,考虑准粒子的热涨落以及能级的统计效应对超导纳米粒子的电子磁化率的影响,计算了弱磁场中的超导金属小粒子的顺磁磁化率,并做了分析. 相似文献