We propose a scheme for probabilistic teleportation of an unknown two-particle state with a four-particle pure entangled state and positive operator valued measure （POVM）. In this scheme the teleportation of an unkn...We propose a scheme for probabilistic teleportation of an unknown two-particle state with a four-particle pure entangled state and positive operator valued measure （POVM）. In this scheme the teleportation of an unknown two-particle state can be realized with certain probability by performing two Bell state measurements, a proper POVM and a unitary transformation.展开更多
A two-dimensional single-mode laser model with cross-correlations between the real and imaginary parts of the quantum noise as well as the pump noise is investigated.The general closed form of the laser intensity Lang...A two-dimensional single-mode laser model with cross-correlations between the real and imaginary parts of the quantum noise as well as the pump noise is investigated.The general closed form of the laser intensity Langevin equation(GILE)is obtained under a stable locked phase resulting from the cross-correlationλ_(q) between the real and imaginary parts of the quantum noise.Because of the presence of a new term containingλ_(q),we can unify the two opposite intensity Langevin equations which correspond to the two special cases for|λ_(q)|→0 and|λ_(q)|→1 in the GILE.It is expected that the transient and stationary properties of the laser model can be changed qualitatively whenλ_(q) varies.展开更多
A scheme for probabilistically teleporting an unknown one-particle state of S-level by a group of pairs of partially entangled 2-level particle state is proposed. In this scheme unitary transformation and local measu...A scheme for probabilistically teleporting an unknown one-particle state of S-level by a group of pairs of partially entangled 2-level particle state is proposed. In this scheme unitary transformation and local measurement take the place of Bell state measurement, then proper unitary transformation and the measurement on an auxiliary qubit with the aid of classical communication are performed. In this way the unknown one-particle state of S-level can be transferred onto a group of remote 2-level particles with certain probability. Furthermore, the receiver can recover the initial signal state on an S-level particle at his hand.展开更多
By using linear approximation we derive expressions for the correlation function,power spectrum and correlation time of the output light intensity in a single-mode laser driven by additive white noise and multiplicati...By using linear approximation we derive expressions for the correlation function,power spectrum and correlation time of the output light intensity in a single-mode laser driven by additive white noise and multiplicative colored noise with an exponential correlation form.The effects of correlation strength and correlation time of the noises on the above quantities are discussed and compared with the case of a delta function correlation form for the noises.展开更多
A new concise approach is presented for analytic study of the properties of the Holstein model. New analytic results for the polaronic band structure and phonon distribution, of the Holstein molecular crystal model, a...A new concise approach is presented for analytic study of the properties of the Holstein model. New analytic results for the polaronic band structure and phonon distribution, of the Holstein molecular crystal model, are given in one dimension. And all analytic results given are in accordance with the known numerical research results.展开更多
In this paper, two schemes for teleporting an unknown four-particle entangled W state is proposed. In the first scheme, two partial entangled four-particle states are used as quantum channels, while in the second sche...In this paper, two schemes for teleporting an unknown four-particle entangled W state is proposed. In the first scheme, two partial entangled four-particle states are used as quantum channels, while in the second scheme,four non-maximally entangled particle pairs are considered as quantum channels. It is shown that the teleportation can be successfully realized with certain probability, for both schemes, if a receiver adopts some appropriate unitary transformations. It is also shown that the successful probabilities of these two schemes are different.展开更多
Citical properties of the bond diluted Blume-Capel model with random crystal filed are considered in the framework of the effective field theory.Special emphasis is places on the comparison study of critical propertie...Citical properties of the bond diluted Blume-Capel model with random crystal filed are considered in the framework of the effective field theory.Special emphasis is places on the comparison study of critical properties under the condition of two different random crystal fleds on square lattice.Calculated results show that the random crystal field plays an important role in the determination of the order of phase transition.The distributions of diffeeent random crystal fields,such as symmetrical and dilution crystal field,lead to apparent charactersitic behaviors.We not only give the description of a detailed phase diagram but also compare the difference between the critical properties of two different random crystal field distributions.This comparison study has not been revealed in previous reports.展开更多
We propose a simultaneous quantum secure direct communication scheme between one party and other three parties via four-particle GHZ states and swapping quantum entanglement. In the scheme, three spatially separated s...We propose a simultaneous quantum secure direct communication scheme between one party and other three parties via four-particle GHZ states and swapping quantum entanglement. In the scheme, three spatially separated senders, Alice, Bob and Charlie, transmit their secret messages to a remote receiver Diana by performing a series of local operations on their respective particles according to the quadripartite stipulation. From Alice, Bob, Charlie and Diana＇s Bell measurement results, Diana can infer the secret messages. Ira perfect quantum channel is used, the secret messages are faithfully transmitted from Alice, Bob and Charlie to Diana via initially shared pairs of four-particle GHZ states without revealing any information to a potential eavesdropper. As there is no transmission of the qubits carrying the secret message in the public channel, it is completely secure for the direct secret communication. This scheme can be considered as a network of communication parties where each party wants to communicate secretly with a central party or server.展开更多
The general scheme for teleportation of a multi-particle d-level quantumstate is presented when m pairs of partially entangled particles are utilized as quantum channels.The probabilistic teleportation can be achieved...The general scheme for teleportation of a multi-particle d-level quantumstate is presented when m pairs of partially entangled particles are utilized as quantum channels.The probabilistic teleportation can be achieved with a successful probability of Π from N=0 to d-1of (C_0~N)~2/d~M, which is determined by the smallest coefficients of each entangled channels.展开更多
In the study,a bistable system is driven by additive colored noise and multiplicative colored noise,whose correlation is of an exponential farm.When the noises are correlated,it is found that the system undergoes a re...In the study,a bistable system is driven by additive colored noise and multiplicative colored noise,whose correlation is of an exponential farm.When the noises are correlated,it is found that the system undergoes a reentrant transition as the correlation strength between noises or multiplicative noise intensity changes,while there is no such phenomenon as the additive noise intensity or the time of correlation changes.No reentrant transition exists when the noises are uncorrelated.展开更多
基金Supported by the Hebei Natural Science Foundation of China under Grant Nos A2004000141 and A2005000140, and the Natural Science Foundation of Hebei Normal University.
文摘We propose a scheme for probabilistic teleportation of an unknown two-particle state with a four-particle pure entangled state and positive operator valued measure （POVM）. In this scheme the teleportation of an unknown two-particle state can be realized with certain probability by performing two Bell state measurements, a proper POVM and a unitary transformation.
基金Supported by the National Natural Science Foundation of China under Grant No.19975020.
文摘A two-dimensional single-mode laser model with cross-correlations between the real and imaginary parts of the quantum noise as well as the pump noise is investigated.The general closed form of the laser intensity Langevin equation(GILE)is obtained under a stable locked phase resulting from the cross-correlationλ_(q) between the real and imaginary parts of the quantum noise.Because of the presence of a new term containingλ_(q),we can unify the two opposite intensity Langevin equations which correspond to the two special cases for|λ_(q)|→0 and|λ_(q)|→1 in the GILE.It is expected that the transient and stationary properties of the laser model can be changed qualitatively whenλ_(q) varies.
文摘A scheme for probabilistically teleporting an unknown one-particle state of S-level by a group of pairs of partially entangled 2-level particle state is proposed. In this scheme unitary transformation and local measurement take the place of Bell state measurement, then proper unitary transformation and the measurement on an auxiliary qubit with the aid of classical communication are performed. In this way the unknown one-particle state of S-level can be transferred onto a group of remote 2-level particles with certain probability. Furthermore, the receiver can recover the initial signal state on an S-level particle at his hand.
基金Supported by the National Natural Science Foundation of China under Grant Nos.19475013,19675014。
文摘By using linear approximation we derive expressions for the correlation function,power spectrum and correlation time of the output light intensity in a single-mode laser driven by additive white noise and multiplicative colored noise with an exponential correlation form.The effects of correlation strength and correlation time of the noises on the above quantities are discussed and compared with the case of a delta function correlation form for the noises.
基金Supported by the Special Foundation of President of Chinese Academy of Sciences.
文摘A new concise approach is presented for analytic study of the properties of the Holstein model. New analytic results for the polaronic band structure and phonon distribution, of the Holstein molecular crystal model, are given in one dimension. And all analytic results given are in accordance with the known numerical research results.
文摘In this paper, two schemes for teleporting an unknown four-particle entangled W state is proposed. In the first scheme, two partial entangled four-particle states are used as quantum channels, while in the second scheme,four non-maximally entangled particle pairs are considered as quantum channels. It is shown that the teleportation can be successfully realized with certain probability, for both schemes, if a receiver adopts some appropriate unitary transformations. It is also shown that the successful probabilities of these two schemes are different.
文摘Citical properties of the bond diluted Blume-Capel model with random crystal filed are considered in the framework of the effective field theory.Special emphasis is places on the comparison study of critical properties under the condition of two different random crystal fleds on square lattice.Calculated results show that the random crystal field plays an important role in the determination of the order of phase transition.The distributions of diffeeent random crystal fields,such as symmetrical and dilution crystal field,lead to apparent charactersitic behaviors.We not only give the description of a detailed phase diagram but also compare the difference between the critical properties of two different random crystal field distributions.This comparison study has not been revealed in previous reports.
基金Supported by the Natural Science Foundation of Hebei Province under Grant Nos A2004000141 and A2005000140, and the Natural Science Foundation of Hebei Normal University.
文摘We propose a simultaneous quantum secure direct communication scheme between one party and other three parties via four-particle GHZ states and swapping quantum entanglement. In the scheme, three spatially separated senders, Alice, Bob and Charlie, transmit their secret messages to a remote receiver Diana by performing a series of local operations on their respective particles according to the quadripartite stipulation. From Alice, Bob, Charlie and Diana＇s Bell measurement results, Diana can infer the secret messages. Ira perfect quantum channel is used, the secret messages are faithfully transmitted from Alice, Bob and Charlie to Diana via initially shared pairs of four-particle GHZ states without revealing any information to a potential eavesdropper. As there is no transmission of the qubits carrying the secret message in the public channel, it is completely secure for the direct secret communication. This scheme can be considered as a network of communication parties where each party wants to communicate secretly with a central party or server.
文摘The general scheme for teleportation of a multi-particle d-level quantumstate is presented when m pairs of partially entangled particles are utilized as quantum channels.The probabilistic teleportation can be achieved with a successful probability of Π from N=0 to d-1of (C_0~N)~2/d~M, which is determined by the smallest coefficients of each entangled channels.
基金Supported by the National Natural Science Foundation of China under Grant Nos.19475013,19675014.
文摘In the study,a bistable system is driven by additive colored noise and multiplicative colored noise,whose correlation is of an exponential farm.When the noises are correlated,it is found that the system undergoes a reentrant transition as the correlation strength between noises or multiplicative noise intensity changes,while there is no such phenomenon as the additive noise intensity or the time of correlation changes.No reentrant transition exists when the noises are uncorrelated.
