Fano Interference versus Kondo Effect in Strongly Correlated T-Shaped Quantum Dots Embedded in an Aharonov-Bohm Ring

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.     

分布式光纤温度传感器系统分辨率确定的理论分析

本文对基于反斯托克斯/斯托克斯比值的分布式光纤温度传感器系统的分辨率,即温度分辨率、空间分辨率和时间分辨率的确定进行了全面而深入的研究,首次用一个数学表达式揭示了三个分辨率的关系。     

A Lower Bound on the Entanglement in the Jaynes-Cummings Model

The entanglement between an atom and field is investigated by using the 3aynes-Cummings model. The initial atomic state is supposed in a mixed state and the field is in a squeezed state. The lower bound on the entanglement quantified by concurrence is calculated. It is found that the entanglement with the atom being initially in a mixed state can be larger than that with the atom being initially in a pure state. The entanglement is not a monotone function of the squeezing parameter r of the field and it achieves the maximum for certain r and then decreases with further increase of r.     

Connections of Coherent Information,Quantum Discord,and Entanglement

For a pure non-markovian dephasing model we derive analytic expressions of coherent information,quantum discord,and entanglement.We find that for the cases of the initial Werner states,the dynamical behavior of coherent information is similar to that of quantum discord but different from that of entanglement.Coherent information,as well as quantum discord,can reveal the quantum correlations in some mixed-states,in which the entanglement is zero.     

Entanglement Transfer and Periodic Sudden Death Phenomenon in Two Parallel 1D Spin Chains of Quantum Spin Network

We investigate the entanglement transfer in two parallel ID spin chains of a quantum spin network, and show that the perfect entanglement transfer can be realized at some special times. In addition, the so-called ＇sudden death＇ phenomenon of entanglement is found in the spin network system.     

Entanglement sudden death induced by the Dzialoshinskii--Moriya interaction

In this paper, we study the entanglement dynamics of two-spin Heisenberg XYZ model with the Dzialoshinskii--Moriya (DM) interaction. The system is initially prepared in the Werner state. The effects of purity of the initial state and DM coupling parameter on the evolution of entanglement are investigated. The necessary and sufficient condition for the appearance of the entanglement sudden death (ESD) phenomenon has been deduced. The result shows that the ESD always occurs if the initial state is sufficiently impure for the given coupling parameter or the DM interaction is sufficiently strong for the given initial state. Moreover, the critical values of them are calculated.     

类氢原子核质量对电子状态的影响

在孤立的两体复合系统中,讨论其中一体的变化如何影响另一体的状态,有助于了解单粒子混合态与纯态的关系.本文讨论5个孤立的一维类氢原子模型系统,原子核的质量互不相同.这5个两体(电子与原子核)复合系统的相对运动状态都处于纠缠态,其中电子状态都用约化密度矩阵表示的混合态描述.在原子核质量趋近无穷大的一维氢原子模型中,电子处于...     

利用单模腔肠与二能级原子的共振相互作用制备纯Fock态

利用单模腔场与二能级原子的共振相互作用，通过对原子进行选择性测量，在一定条件下，制备了纯Ｆｏｃｋ态。     

利用原子-腔场的拉曼相互作用制备双模SU(2)薛定谔猫态

利用一个参量频率转换过程,在腔中制备双模ＳＵ（２）相干态,然后注入一个与腔场的一个个模发生拉曼相互作用的Ａ型三能级原子,通过原子－腔场相互作用生成腔场－原子纠缠,通过对原子进行选择性测量,腔场－原子纠缠态将塌缩到纯态,即双模ＳＵ（２）薛定谔猫态。     

Ar^1^6^＋离子双激发态的新量子数描述和跃迁规律

此文采用ＣＩ方法计算了类氦Ａｒ１６＋离子双激发态能级和波函数，并向ＤＥＳＢ（Ｄｏｕｂｌｙ－ｅｘｅｃｉｔｅｄｓｔａｔｅｓｂａｓｉｓ）做投影，求出表征这些双激发态的新量子数Ｋ、Ｔ和Ａ。计算和比较了初态ｎ（ｎ－１，０）ｎ＋１Ｓｅ的辐射和Ａｕｇｅｒ跃迁率，发现辐射跃迁随初态主量子数ｎ的变化是光滑的，而Ａｕｇｅｒ跃迁则随ｎ的变化是不光滑的。