We designed the experimental generation system of the optical GHZ-like and cluster-like quadripartite entangled states for continuous variables.We theoretically demonstrated that the two different types of quadriparti...We designed the experimental generation system of the optical GHZ-like and cluster-like quadripartite entangled states for continuous variables.We theoretically demonstrated that the two different types of quadripartite entangled states can be obtained by the linearly optical transformation of four amplitude-quadrature and phase-quadrature squeezed states produced from a pair of nondegenerate optical parametric amplifiers under appropriate phase relations.The criteria for full inseparability of quadripartite cluster-like state were deduced,and the dependency of the quadripartite entanglement on the initial squeezing degree,the transmission efficiencies of the system and the detection efficiency of homodyne detection were numerically calculated.展开更多
In this paper, we suggest a controlled mutual quantum entity authentication protocol by which two users mutually certify each other on a quantum network using a sequence of Greenberger–Horne–Zeilinger（GHZ）-like st...In this paper, we suggest a controlled mutual quantum entity authentication protocol by which two users mutually certify each other on a quantum network using a sequence of Greenberger–Horne–Zeilinger（GHZ）-like states. Unlike existing unidirectional quantum entity authentication, our protocol enables mutual quantum entity authentication utilizing entanglement swapping; moreover, it allows the managing trusted center（TC） or trusted third party（TTP） to effectively control the certification of two users using the nature of the GHZ-like state. We will also analyze the security of the protocol and quantum channel.展开更多
<正> An experimentally feasible scheme for implementing teleportation of multi-atom cat-like states in cavityQED is proposed.In the scheme the atoms interact simultaneously with a highly detuned cavity mode and ...<正> An experimentally feasible scheme for implementing teleportation of multi-atom cat-like states in cavityQED is proposed.In the scheme the atoms interact simultaneously with a highly detuned cavity mode and are driven bya strong classical field,and the atomic state evolution is independent of cavity field state.Thus the scheme is insensitiveto both the cavity decay and the thermal field,which is of importance from the experimental point of view.All theorthogonal and complete multi-atom GHZ states can be exactly distinguished only by one step,so our scheme can alsobe used for other purposes such as dense coding using multi-atom GHZ states as quantum channels.展开更多
By using GHZ-like states and entanglement swapping, Kang et al. [Chin. Phys. B 24(2015) 090306]proposed a controlled mutual quantum entity authentication protocol. We find that the proposed protocol is not secure,that...By using GHZ-like states and entanglement swapping, Kang et al. [Chin. Phys. B 24(2015) 090306]proposed a controlled mutual quantum entity authentication protocol. We find that the proposed protocol is not secure,that is, the center, Charlie can eavesdrop the secret keys shared between Alice and Bob without being detected.展开更多
基金Supported by the National Natural Science Foundation of China(Grant Nos.10674088 and 60608012)Program for Changjiang Scholars andInnovative Research Team in University(Grant No.IRT0516)
文摘We designed the experimental generation system of the optical GHZ-like and cluster-like quadripartite entangled states for continuous variables.We theoretically demonstrated that the two different types of quadripartite entangled states can be obtained by the linearly optical transformation of four amplitude-quadrature and phase-quadrature squeezed states produced from a pair of nondegenerate optical parametric amplifiers under appropriate phase relations.The criteria for full inseparability of quadripartite cluster-like state were deduced,and the dependency of the quadripartite entanglement on the initial squeezing degree,the transmission efficiencies of the system and the detection efficiency of homodyne detection were numerically calculated.
基金Project supported by the Research Foundation of Korea University
文摘In this paper, we suggest a controlled mutual quantum entity authentication protocol by which two users mutually certify each other on a quantum network using a sequence of Greenberger–Horne–Zeilinger（GHZ）-like states. Unlike existing unidirectional quantum entity authentication, our protocol enables mutual quantum entity authentication utilizing entanglement swapping; moreover, it allows the managing trusted center（TC） or trusted third party（TTP） to effectively control the certification of two users using the nature of the GHZ-like state. We will also analyze the security of the protocol and quantum channel.
基金The project supported by National Natural Science Foundation of China under Grant No. 10374025 and the Scientific Research Fund of the Education Department of Hunan Province under Grant No. 01c260
文摘<正> An experimentally feasible scheme for implementing teleportation of multi-atom cat-like states in cavityQED is proposed.In the scheme the atoms interact simultaneously with a highly detuned cavity mode and are driven bya strong classical field,and the atomic state evolution is independent of cavity field state.Thus the scheme is insensitiveto both the cavity decay and the thermal field,which is of importance from the experimental point of view.All theorthogonal and complete multi-atom GHZ states can be exactly distinguished only by one step,so our scheme can alsobe used for other purposes such as dense coding using multi-atom GHZ states as quantum channels.
基金Supported by the 2014-year Program for Excellent Youth Talents in University of Anhui Provincethe Talent Scientific Research Fundation of Tongling University under Grant No.2015tlxyrc01the Program for Academic Leader Reserve Candidates in Tongling University under Grant No.2014tlxyxs30
文摘By using GHZ-like states and entanglement swapping, Kang et al. [Chin. Phys. B 24(2015) 090306]proposed a controlled mutual quantum entity authentication protocol. We find that the proposed protocol is not secure,that is, the center, Charlie can eavesdrop the secret keys shared between Alice and Bob without being detected.
