共查询到20条相似文献,搜索用时 265 毫秒
1.
LIUXiao-Shu LONGGui-Lu TONGDian-Min 《理论物理通讯》2003,40(1):45-47
This paper generalizes the quantum clock synchronization protocol of Josza, et al., [Richard Jozsa, et al.,Phys. Rev. Lett. 85 (2000) 2010] to synchronize space and thne simultaneously. 相似文献
2.
ZHA Xin-Wei 《理论物理通讯》2008,50(3):637-639
Recently Jiang et al. [Chin. Phys. Lett. 24 (2007) 1144] gave a scheme for probabilistic controlled teleportation of a triplet W
state from the sender Alice to the distant receiver Bob. The $m$ controlled
qubits are shared by m(s1,s2,…, sm) spatially-separated
supervisors. Based on transformation operator, we can extend to
teleporting an arbitrary three-qubit state. The relation between the
transformation operators and the Bob's unitary transformation is also
obtained. 相似文献
3.
A stochastic local limited one-dimensional rice-pile model is numerically investigated. The distributions for avalanche sizes have a clear power-law behavior and it displays a simple finite size scaling. We obtain the avalanche exponents
τs=1.54±0.10,
βs=2.17±0.10 and
τT=1.80±0.10,
βT=1.46±0.10.
This self-organized critical model belongs to the same universality
class with the Oslo rice-pile model studied by K. Christensen et al.
[Phys. Rev. Lett. 77 (1996) 107], a rice-pile model studied by L.A.N. Amaral et al. [Phys. Rev. E 54 (1996) 4512], and a simple deterministic self-organized critical model studied by
M.S. Vieira [Phys. Rev. E 61 (2000) 6056]. 相似文献
4.
In this paper, we use the result in
[C.Y. Sun and D.H. Zhang, arXiv:astro-ph/0510709] to calculate the non-Gaussianity of the racetrack models in
[J.J. Blanco-Pillado, et al., JHEP
0411 (2004) 063;
arXiv:hep-th/0406230] and [J.J. Blanco-Pillado, et al.,
arXiv:hep-th/0603129]. The two models give different non-Gaussianities.
Both of them are reasonable. However, we find that, for multi-field
inflationary models with the non-trivial metric of the field space,
the condition of the slow-roll cannot guarantee small non-Gaussianities. 相似文献
5.
6.
LiJia-Hua CHENAi-Xi WANGWen-Yi 《理论物理通讯》2003,40(3):293-298
In this paper, using the arguments of Wu et al. [Phys. Rev. Left. 86 (2001) 2200] we analytically discuss the energy spectra and corresponding eigenstates for the process of κ-photon down-conversion with quantized pump in a high-Q cavity by the aid of the computer programme. Remarkably, it is also shown that such a method can be used for solving numerically the equations in a much simpler manner than the previous ones. 相似文献
7.
Based on the theory of gravitation with torsion developed by Hammond [Rep. Prog. Phys. 65 (2002) 599], the interaction between the intrinsic spin of a particle and the mass source is calculated. It is shown that spin can interact with the gravitimagnetic field created by a rotational mass, where the spin-rotation coupling is also discussed. According to the recent torsion pendulum experiment with polarized electrons by Heckel
et al. [Phys. Rev. Lett. 97 (2006) 021603], we set a new limit
on the value of the torsion coupling constant K as K∈[0.53,0.95],
which has improved many orders than the constraints from the early spin-spin
experiment with K<2×1014. 相似文献
8.
HAN Lian-Fang FANG Ming SHI Shou-Hua ZHANG Zhan-Jun 《理论物理通讯》2006,46(2):217-220
A probabilistic teleportation scheme for atomic stats via cavity QED [Phys. Rev. A 70 (2004) 054303] is revisited and accordingly some improvements are made. 相似文献
9.
QIAN Shang-Wu MIAO Chun-Hui GU Zhi-Yu 《理论物理通讯》2006,46(1):37-38
This article uses the supersymmetric WKB approximation to obtain the approximate energy levels and wave functions of the anharmonic potential V(r) = ar^2 + br^-4 + cr^-6 in order to tesify the correctness between [Phys. Left. A 170 (1992) 335] and the paper written by M. Landtman [Phys. Left. A 175 (1993) 147]. 相似文献
10.
We investigate the generation of entanglement of coherent
excitonic states in coupled quantum dots placed in a cavity by meaning of
the state preparation fidelity [Nature (London) 404 (2002) 256;
Phys. Rev. A 65 (2002) 012107; J. Uffink, Phys. Rev. Lett.88 (2002) 230406.] The effect of the number of excitons and the coherent intensity |α| of the cavity
field on the entanglement is also studied. 相似文献
11.
We propose a scheme for approximately and conditionally teleporting an unknown atomic-entangled state in dissipative cavity QED. It
is the further development of the scheme of [Phys. Rev. A 69
(2004) 064302], where the cavity mode decay has not been considered and the
state teleportated is an unknown atomic state. In this paper, we investigate
the influence of the decay on the approximate and conditional teleportation of the unknown atomic-entangled state, which is different from that teleportated
in [Phys. Rev. A 69 (2004) 064302] and then give the fidelity of
the teleportation, which depends on the cavity mode decay. The scheme
may be generalized to not only the teleportation of the
cavity-mode-entangled-state by means of a single atom but also the
teleportation of the unknown trapped-ion-entangled-state in a linear ion trap. 相似文献
12.
WANG Jian ZHANG Quan TANG Chao-Jing 《理论物理通讯》2007,48(4):637-640
We present a quantum secure communication scheme using three-qubit W state. It is unnecessary for the present scheme to use alternative measurement or Bell basis measurement. Compared with the quantum secure direct communication scheme proposed by Cao et at. [H.J. Cao and H.S. Song, Chin. Phys. Lett. 23 (2006) 290], in our scheme, the detection probability for an eavesdropper's attack increases from 8.3% to 25%. We also show that our scheme is secure for a noise quantum channel. 相似文献
13.
By using the further extended tanh method [Phys. Lett. A 307 (2003) 269; Chaos, Solitons & Fractals 17 (2003) 669] to the Broer-Kaup system with variable coefficients, abundant new soliton-like solutions and multl-solitonlike solutions are derived. Based on the derived multi-soliton-like solutions which contain arbitrary functions, some interesting multi-soliton structures are revealed. 相似文献
14.
XU Chang Zhong-Zhou 《理论物理通讯》2006,46(3):533-537
We investigate the ground-state rotational bands of nuclei with Z 〉 100 using cluster model proposed by Buck et al. [Phys. Rev. Left. 94 (2005) 202501]. The core-duster decomposition of each nucleus is determined by the corresponding electric quadrupole transition strength B(E2 : 2^+ → 0^+). The theoretical spectra of fermium and nobelium isotopes are compared with available experimental data. Good agreement between model and data is obtained. 相似文献
15.
Classical Communication and Entanglement Cost in Preparing a Class of Multi-qubit States 总被引:1,自引:0,他引:1
PAN Gui-Xia LIU Yi-Min ZHANG Zhan-Jun 《理论物理通讯》2008,49(3):631-634
Recently, several similar protocols [J. Opt. B 4 (2002) 380; Phys. Lett. A 316 (2003) 159; Phys. Lett. A 355 (2006) 285; Phys. Lett. A 336 (2005) 317] for remotely preparing a class of multi-qubit states (i.e, α[0...0〉 +β[1... 1〉) were proposed, respectively. In this paper, by applying the controlled-not (CNOT) gate, a new simple protocol is proposed for remotely preparing such class of states. Compared to the previous protocols, both classical communication cost and required quantum entanglement in our protocol are remarkably reduced. Moreover, the difficulty of identifying some quantum states in our protocol is also degraded. Hence our protocol is more economical and feasible. 相似文献
16.
Local sum uncertainty relations for angular momentum operators of bipartite permutation symmetric systems
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I Reena H S Karthik J Prabhu Tej Sudha A R Usha Devi and A K Rajagopal 《中国物理 B》2022,31(6):60301-060301
We show that violation of the variance based local sum uncertainty relation (LSUR) for angular momentum operators of a bipartite system, proposed by Hofmann and Takeuchi [Phys. Rev. A 68 032103 (2003)], reflects entanglement in the equal bipartitions of an N-qubit symmetric state with even qubits. We establish the one-to-one connection with the violation of LSUR with negativity of covariance matrix [Phys. Lett. A 364 203 (2007)] of the two-qubit reduced system of a permutation symmetric N-qubit state. 相似文献
17.
WU Zhen-Zhen FANG Mao-Fa JIANG Chun-Lei 《理论物理通讯》2006,46(3):553-555
Based on two atoms and two cavities initially in two pairs of atom-photon nonmaximally entangled states, we propose a relatively simple scheme to create maximally entangled photon-photon and atom-photon states via entanglement swapping using techniques of cavity QED inspired by the scheme proposed in [Phys. Rev. A 71 (2005) 044302] and [Phys. Rev. A 71 (2005) 034312]. Our scheme does not involve the measurement in Bell basis, we only require detecting the states of atoms. 相似文献
18.
MA Xiao-San WANG An-Min YANG Xiao-Dong XU Feng 《理论物理通讯》2005,44(2):274-278
Based on the algebraic entanglement measure proposed [G. Vidal et al., Phys. Rev. A 65 (2002) 032314],we study the entanglement evolution of both pure quantum states and mixed ones of 2-qutrit system in a symmetrybroken environment consisting of a fermionic bath. Entanglement of states will decrease or remain constant under the influence of environment, and the class of states which remain unchanged has been found out. 相似文献
19.
WU Chun-Wang CHEN Ping-Xing LI Cheng-Zu 《理论物理通讯》2008,49(6):1502-1504
W. Dur et al. have shown that it is impossible to obtain a GHZ state from one copy of arbitrary W-class state via local operations and classical communication (LOCC) [W. Dur, G. Vidal, and J.I. Cirac, Phys. Rev. A 62 (2000) 062314]. In our paper, the more general case is carefully investigated. We first show that, with a supply of two copies of arbitrary W-class state, we can always construct an explicit procedure to distill a GHZ state with a nonzero probability. Then based on this result, a simple procedure for distilling GHZ state from n copies of arbitrary W-class state is presented. Finally, we briefly discuss the applications. 相似文献
20.
BAICheng-Lin GUOJun ZHAOHong 《理论物理通讯》2005,44(1):85-88
In this paper, a new generalized extended tanh-function method is presented for constructing soliton-like,period-form solutions of nonlinear evolution equations (NEEs). This method is more powerful than the extended tanhfunction method [Phys. Left. A 277 (2000) 212] and the modified extended tanh-function method [Phys. Left. A 285 (2001) 355]. Abundant new families of the exact solutions of Bogoyavlenskii‘s generalized breaking soliton equation are obtained by using this method and symbolic computation system Maple. 相似文献