共查询到19条相似文献,搜索用时 664 毫秒
1.
2.
3.
提出一种利用GHZ态实现多原子缠结态的量子隐形传态方案.当作为量子通道的GHZ态含有一个单模高Q腔时,大大地简化了量子稳形传态中的联合测量过程. 相似文献
4.
提出一种利用 GHZ态实现多原子缠结态的量子隐形传态方案 .当作为量子通道的 GHZ态含有一个单模高 Q腔时 ,大大地简化了量子稳形传态中的联合测量过程 相似文献
5.
邵瑞 《原子与分子物理学报》2008,25(6):1352-1356
我们提出一个方案通过极化光子的干涉来制备囚禁在相距很远的腔中的n原子GHZ类态。在该方案中,原子腔耦合强度小于腔衰减率。因此对腔的品质因子的要求大大降低了,而且,该方案的保真度不受探测器效率和原子自发衰变的影响。
中文关键词:纠缠制备;GHZ类态;腔QED 相似文献
6.
7.
8.
利用一个(N 1)粒子部分纠缠Greenberger-Home-Zeilinger(GHZ)态作为量子通道,提出了概率远程制备N粒子GHZ态的两个方案.我们考虑了怎样远程制备一个任意的GHZ态,即两个参数α和β都是复数的情况.此外,计算了远程制备总的成功概率和需要的经典信息量. 相似文献
9.
10.
提出基于腔QED技术的多用户间的多原子W态和GHZ态量子信道的建立方案.在量子网络的空闲时段,各个用户和量子交换机共享EPR对.量子交换机通过原子和腔场的相互作用将两个EPR对制备成W态,再与另一个EPR对进行纠缠交换,经过直接测量后为用户建立三原子W态量子信道;同时讨论了四用户间的W态量子信道的建立方案.量子交换机对三个EPR对进行纠缠交换,将三个原子同时与腔场作用,经过直接测量后为用户建立三原子GHZ态量子信道;并将此方法推广到N个用户间的GHZ态量子信道的建立.
关键词:
腔QED
量子信道
量子交换机
纠缠交换 相似文献
11.
A scheme for generating cluster states via Raman interaction is proposed. In the scheme, we firstly prepare cluster states of multi-cavities with information encoded in the coherent states and then generate cluster states of multiatoms, which encode the information in the ground states of A-type atoms. The advantages of our scheme are that the atomic spontaneous radiation can be efficiently reduced since the cavity frequency is largely detuned from the atomic transition frequency and the Hadamard gate operation of the coherent states is replaced by measuring the coherent states. 相似文献
12.
Dao-Ming Lu 《International Journal of Theoretical Physics》2010,49(8):1863-1869
We propose a scheme for teleportation of an arbitrary two-mode N-photon entangled states in cavity QED. The scheme is based on the resonant interaction between Λ-type atoms and two-mode
cavity fields. In contrast to all the theoretical schemes proposed previously in cavity QED for teleportation of two-mode
cavity field states, in the present scheme, the established entanglement for the quantum channel is the type of the multi-dimensional
entanglement between the symmetric multi-atom Dicke states and two-mode N-photon states. Therefore, the scheme extends the scope of the theoretical study of the teleportation. 相似文献
13.
Wen Zhang Xue-qin Zuo Zi-yun Zhang 《International Journal of Theoretical Physics》2012,51(11):3551-3558
We propose a tripartite scheme for sharing a ququart pure state by using three Bell states as the quantum channel. The scheme is then generalized to qudit state case. We also show that this scheme is applicable to sharing any multi-qudit entangled states. 相似文献
14.
ASHOK VUDAYAGIRI 《Pramana》2011,77(6):1127-1133
A scheme is proposed for achieving a controlled phase gate using interaction between atomic spin dipoles. Further, the spin
states are prepared in coherent population trap states (CPTs), which are robust against perturbations, laser fluctuations
etc. We show that one-qubit and two-qubit operations can easily be obtained in this scheme. The scheme is also robust against
decoherences due to spontaneous emissions as the CPT states used are dressed states formed out of Zeeman sublevels of ground
states of the bare atom. However, certain practical issues are of concern in actually obtaining the scheme, which are also
discussed at the end of this paper. 相似文献
15.
利用弱非线性的交叉克尔介质和对强相干探测场的动量积分零拍探测,呈现了一个关于制备六光子最大纠缠态的方案,如实现制备Dicke态和W态.在本方案中,只要相干探测光场的强度足够大时,对交叉克尔介质的非线性强度要求可以较弱,因而当前实验技术条件上均能满足本方案的要求.考虑到目前实验上实现单光子很是相对困难的,在信号模上仅用弱... 相似文献
16.
17.
Wei Li Jinjing Shi Ronghua Shi Ying Guo 《International Journal of Theoretical Physics》2017,56(8):2579-2587
A novel blind quantum signature scheme based on cluster states is introduced. Cluster states are a type of multi-qubit entangled states and it is more immune to decoherence than other entangled states. The controlled four-particle cluster states are created by acting controlled-Z gate on particles of four-particle cluster states. The presented scheme utilizes the above entangled states and simplifies the measurement basis to generate and verify the signature. Security analysis demonstrates that the scheme is unconditional secure. It can be employed to E-commerce systems in quantum scenario. 相似文献
18.
19.
This paper proposes a scheme for implementing the teleportation of an arbitrary unknown two-atom state by using a cluster state of four identical 2-level atoms as quantum channel in a thermal cavity. The two distinct advantages of the present scheme are: (i) The discrimination of 16 orthonormal cluster states in the standard teleportation protocol is transformed into the discrimination of single-atom states. Consequently, the discrimination difficulty of states is degraded. (ii) The scheme is insensitive to the cavity field state and the cavity decay for the thermal cavity is only virtually excited when atoms interact with it. Thus, the scheme is more feasible. 相似文献