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 ...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.展开更多
I present a new scheme for probabilistic remote preparation of a general two-qubit state from a sender to either of two receivers.The quantum channel is composed of a partial entangled tripartite Greenberger-Horne-Zei...I present a new scheme for probabilistic remote preparation of a general two-qubit state from a sender to either of two receivers.The quantum channel is composed of a partial entangled tripartite Greenberger-Horne-Zeilinger (GHZ) state and a W-type state.I try to realize the remote two-qubit preparation by using the usual projective measurement and the method of positive operator-valued measure,respectively.The corresponding success probabilities of the scheme with different methods as well as the total classical communication cost required in this scheme are also calculated.展开更多
Under the preconditions that a (n:n)-qutrit pure state is taken as the quantum channel to teleport an arbitrary n-qutrit state and the sender is able to perform generalized-Bell-state measurements and publish the resu...Under the preconditions that a (n:n)-qutrit pure state is taken as the quantum channel to teleport an arbitrary n-qutrit state and the sender is able to perform generalized-Bell-state measurements and publish the results, the necessary transformation operation in the receiver's site is worked out in terms of the technique of swapping states. A criterion on whether such quantum channel can be utilized for perfect teleportation is derived by virtue of the unitarity of the resultant transformation operator. Moreover, the flexibility between the measurement difficulty and the reconstruction difficulty is shown and discussed.展开更多
I present a new protocol for three-party quantum secure direct communication (QSDC) with a set ofordered M Einstein-Podolsky-Rosen (EPR) pairs.In the scheme, by performing two unitary operations and Bell statemeasurem...I present a new protocol for three-party quantum secure direct communication (QSDC) with a set ofordered M Einstein-Podolsky-Rosen (EPR) pairs.In the scheme, by performing two unitary operations and Bell statemeasurements, it is shown that the three legitimate parties can exchange their respective secret message simultaneously.Then I modify it for an experimentally feasible and secure quantum sealed-bid auction (QSBD) protocol.Furthermore, Ialso analyze the security of the protocol, and the scheme is proven to be secure against the intercept-and-resend attack,the disturbance attack and the entangled-and-measure attack.展开更多
We propose a three-party scheme for quantum information splitting(QIS) of an arbitrary single-photon polarization state based on weak cross-Kerr nonlinearity combined with linear optics elements such as polarization b...We propose a three-party scheme for quantum information splitting(QIS) of an arbitrary single-photon polarization state based on weak cross-Kerr nonlinearity combined with linear optics elements such as polarization beam splitters(PBSs) and half wave plates(HWPs). The scheme is generalized to the arbitrary-party case. With the help of quantum nondemolition(QND) measurements, our schemes can be accomplished in an almost deterministic way. The two schemes are feasible with the current technology.展开更多
In this paper we propose two quantum information splitting (QIS) schemes respectively for splitting an unknown single-qutrit and single-ququart state via three pairs of two-qubit partially entangled state. The necessa...In this paper we propose two quantum information splitting (QIS) schemes respectively for splitting an unknown single-qutrit and single-ququart state via three pairs of two-qubit partially entangled state. The necessary measurements and operations are given detailedly and the success probabilities are worked out. The two schemes can be directly generalized to QIS of multi-qutrit and multi-ququart states by using Bell-states channel.展开更多
基金supported by the Program for New Century Excellent Talents at the University of China (Grant No NCET-06-0554)the National Natural Science Foundation of China (Grant Nos 60677001 and 10747146)+3 种基金the Science-Technology Fund of AnhuiProvince for Outstanding Youth of China (Grant No 06042087)the Key Fund of the Ministry of Education of China (Grant No 206063)the Natural Science Foundation of Guangdong Province of China (Grant Nos 06300345 and 7007806)Natural Science Foundation of Hubei Province of China (Grant No 2006ABA354)
文摘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.
基金Supported by the 211 Project of Anhui University under Grant No.2009QN028B
文摘I present a new scheme for probabilistic remote preparation of a general two-qubit state from a sender to either of two receivers.The quantum channel is composed of a partial entangled tripartite Greenberger-Horne-Zeilinger (GHZ) state and a W-type state.I try to realize the remote two-qubit preparation by using the usual projective measurement and the method of positive operator-valued measure,respectively.The corresponding success probabilities of the scheme with different methods as well as the total classical communication cost required in this scheme are also calculated.
基金The project supported by National Natural Science Foundation of China under Grant No. 10304022,the Science-Technology Fund of Anhui Province for 0utstanding Youth under Grant No. 06042087, the General Fund of the Educational Committee of Anhui Province under Grant No. 2006KJ260B, the Key Fund of the Ministry of Education of China under Grant No. 206063. We are very grateful to Prof. Zhan-Jun Zhang for his detailed instructions and helps.
基金supported by the Specialized Research Fund for theDoctoral Program of Higher Education (Grant No. 20103401110007)the National Natural Science Foundation of China (Grant Nos. 10975001,10747146, 10874122 and 11074001)+1 种基金the Talent Foundation of High Education of Anhui Province for Outstanding Youth (Grant No. 2009SQRZ018)the 211 Project of Anhui University
文摘Under the preconditions that a (n:n)-qutrit pure state is taken as the quantum channel to teleport an arbitrary n-qutrit state and the sender is able to perform generalized-Bell-state measurements and publish the results, the necessary transformation operation in the receiver's site is worked out in terms of the technique of swapping states. A criterion on whether such quantum channel can be utilized for perfect teleportation is derived by virtue of the unitarity of the resultant transformation operator. Moreover, the flexibility between the measurement difficulty and the reconstruction difficulty is shown and discussed.
基金Supported by the 211 Project of Anhui University under Grant No.2009QN028B
文摘I present a new protocol for three-party quantum secure direct communication (QSDC) with a set ofordered M Einstein-Podolsky-Rosen (EPR) pairs.In the scheme, by performing two unitary operations and Bell statemeasurements, it is shown that the three legitimate parties can exchange their respective secret message simultaneously.Then I modify it for an experimentally feasible and secure quantum sealed-bid auction (QSBD) protocol.Furthermore, Ialso analyze the security of the protocol, and the scheme is proven to be secure against the intercept-and-resend attack,the disturbance attack and the entangled-and-measure attack.
基金Supported by the 211 Project of Anhui University and the Natural Science Foundation of China under Grant Nos.11374013 and 11165008
文摘We propose a three-party scheme for quantum information splitting(QIS) of an arbitrary single-photon polarization state based on weak cross-Kerr nonlinearity combined with linear optics elements such as polarization beam splitters(PBSs) and half wave plates(HWPs). The scheme is generalized to the arbitrary-party case. With the help of quantum nondemolition(QND) measurements, our schemes can be accomplished in an almost deterministic way. The two schemes are feasible with the current technology.
基金Supported by the 211 Project of Anhui University, the National Science Foundation of China under Grant Nos. 11074002 and 50901074the Anhui Provincial Natural Science Fund under Grant No. 11040606M49the Higher Educational Natural Science Foundation of Anhui Province under Grant No. KJ2012A007
文摘In this paper we propose two quantum information splitting (QIS) schemes respectively for splitting an unknown single-qutrit and single-ququart state via three pairs of two-qubit partially entangled state. The necessary measurements and operations are given detailedly and the success probabilities are worked out. The two schemes can be directly generalized to QIS of multi-qutrit and multi-ququart states by using Bell-states channel.