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1.
We consider the construction of exact eigenstates of the two-dimensional Fermi–Hubbard model defined on an L × L lattice with a periodic condition. Based on the characteristics of Slater determinants, several methods are introduced to construct exact eigenstates of the model. The eigenstates constructed are independent of the on-site electron interaction and some of them can also represent exact eigenstates of the two-dimensional Bose–Hubbard model.  相似文献   
2.
We propose schemes to generate an n-coherent-pulse GHZ state and a cluster state via the interaction between n coherent pulses and a two-sided cavity.In these schemes,a strong coupling condition is not needed,which makes the protocols possibly able to be implemented based on the current experiment technology.  相似文献   
3.
林秀敏 《光子学报》2001,30(2):145-147
把一维q变形振子的结论推广到Dq变形振子体系,得到了Dq变形振子体系的哈密顿算符形式,并求出了其本征值和在坐标象中的本征函数.结果显示,这是一个非线性振子.  相似文献   
4.
Scheme for implementing quantum secret sharing via cavity QED   总被引:1,自引:0,他引:1       下载免费PDF全文
陈志华  林秀敏 《中国物理》2005,14(9):1821-1824
An experimentally feasible scheme for implementing quantum secret sharing via cavity quantum electrodynamics (QED) is proposed. The scheme requires the large detuning of the cavity field from the atomic transition, the cavity is only virtually excited, thus the requirement on the quality factor of the cavity is greatly loosened.  相似文献   
5.
This paper proposes a scheme to teleport an arbitrary mixture of diagonal states of multiqutrit via classical correlation and classical communication. To teleport an arbitrary mixture of diagonal states of N qutrits, N classically correlated pairs of two qutrits are used as channel. The sender (Alice) makes Fourier transform and conditional gate (i.e., XOR(3) gate) on her qutrits and does measurement in appropriate computation bases. Then she sends N ctrits to the receiver (Bob). Based on the received information, Bob performs the corresponding unitary transformation on his qutrits and obtains the teleported state. Teleportation of an arbitrary mixture of diagonal states of multiqudit is also discussed.  相似文献   
6.
基于绝热过程,仅需一个真空腔即可分别实现未知单原子态、双原子纠缠态及GHZ态的转移.在这些方案中,量子信息都存储在原子的基态,且系统仅在暗态空间中演化,原子激发态上无布居,这使得原子的自发辐射效应大大受到抑制.相比之前的方案,这些方案所需资源更少,操作更简单.另外,还讨论了其在实验上实现的可行性.  相似文献   
7.
文章提出一个在高品质腔中利用选择性相互作用制备Bell态和W态的方案。该方案通过参数的选择来严格控制囚禁原子和腔场之间的相互作用,在所需要的子空间里实现共振跃迁,而让原子的其它跃迁处于大失谐,从而可以绝热去除。因此,本方案可以有效抑制原子的自发辐射,而且不需要对腔中原子独立寻址,使其在实验上更容易实现。  相似文献   
8.
A scheme is proposed for generating a multiparticle three-dimensional entangled state by appropriately adiabatic evolutions, where atoms are respectively trapped in separated cavities so that individual addressing is needless. In the ideal case, losses due to the spontaneous transition of an atom and the excitation of photons are efficiently suppressed since atoms are all in ground states and the fields remain in a vacuum state. Compared with the previous proposals, the present scheme reduces its required operation time via simultaneously controlling four classical fields. This advantage would become even more obvious as the number of atoms increases. The experimental feasibility is also discussed. The successful preparation of a high-dimensional multiparticle entangled state among distant atoms provides better prospects for quantum communication and distributed quantum computation.  相似文献   
9.
三维各向同性q变形振子的双波描述   总被引:2,自引:1,他引:1  
林秀敏 《光子学报》2001,30(6):657-659
利用双波函数理论描述三维各向同性q变形振子力学量随时间的演化方程,结果显示粒子做非线性振动.同时,当r→0时,所有结论退化为普通三维各向同性谐振子的相关结果.  相似文献   
10.
We propose a scheme to generate a 3 x 3-dimensional maximally entangled state of two particles. Two three-level atoms interact with a strongly detuned cavity so that the cavity is only virtually excited and efficient decoherence time of the cavity is greatly prolonged. Compared to other protocols, this protocol is simpler and has a higher fidelity.  相似文献   
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