This paper proposes scalable schemes to generate the Greenberger-Horne-Zeilinger （GHZ） state and the cluster state with atomic ensembles via the dipole blockade mechanism on an atom chip, where the qubit is not carr...This paper proposes scalable schemes to generate the Greenberger-Horne-Zeilinger （GHZ） state and the cluster state with atomic ensembles via the dipole blockade mechanism on an atom chip, where the qubit is not carried by a single atom but an atomic ensemble. In the protocols, multiqubit entangled states are determinately prepared. Needlessness for single-photon source further decreases the complexity of the experiment. Based on the present laboratory technique, the schemes may be realized. The achieved results reveal a prospect for large-scale quantum communication and quantum computation.展开更多
Based on the Wu's scheme[C.F.Wu,J.L.Chen,L.C.Kwekl,and C.H.Ohel,Phys.Rev.A 73(2006)012310],we prepare the general N-qubit W state.We find that the concurrence of two qubits in general N-qubit Wstate is only relate...Based on the Wu's scheme[C.F.Wu,J.L.Chen,L.C.Kwekl,and C.H.Ohel,Phys.Rev.A 73(2006)012310],we prepare the general N-qubit W state.We find that the concurrence of two qubits in general N-qubit Wstate is only related to their coefficients and we successfully apply the general N-qubit W state to quantum state transferand quantum state prepare like that in two-qubit system.展开更多
A symmetric and(n,n)-threshold scheme for a sender to partition his/her arbitrary single-qubit information among n recipients is proposed by using a newly constructed asymmetric(n+1)-qubit W state.Both the scheme in s...A symmetric and(n,n)-threshold scheme for a sender to partition his/her arbitrary single-qubit information among n recipients is proposed by using a newly constructed asymmetric(n+1)-qubit W state.Both the scheme in some given scenarios and the new W state are also discussed given.展开更多
We present an efficient and simple protocol to unambiguously distinguish 2Nmutual orthogonal N-qubit Greenberger–Horne–Zeilinger states in polarization degree of freedom assisted by the frequency one. This scheme is...We present an efficient and simple protocol to unambiguously distinguish 2Nmutual orthogonal N-qubit Greenberger–Horne–Zeilinger states in polarization degree of freedom assisted by the frequency one. This scheme is based on N single photon Bell state measurements, which can be implemented non-locally. The success probability is100% in principle and our scheme is feasible with current technology. All the advantages make our protocol meaningful and practical in quantum information processing.展开更多
基金supported by the National Natural Science Foundation of China (Grant Nos.60878059,10947147,60677044,and 10574022)the Natural Science Foundation of Fujian Province of China (Grant No.2007J0002)
文摘This paper proposes scalable schemes to generate the Greenberger-Horne-Zeilinger （GHZ） state and the cluster state with atomic ensembles via the dipole blockade mechanism on an atom chip, where the qubit is not carried by a single atom but an atomic ensemble. In the protocols, multiqubit entangled states are determinately prepared. Needlessness for single-photon source further decreases the complexity of the experiment. Based on the present laboratory technique, the schemes may be realized. The achieved results reveal a prospect for large-scale quantum communication and quantum computation.
基金National Natural Science Foundation of China under Grant Nos.10575017 and 10547106
文摘Based on the Wu's scheme[C.F.Wu,J.L.Chen,L.C.Kwekl,and C.H.Ohel,Phys.Rev.A 73(2006)012310],we prepare the general N-qubit W state.We find that the concurrence of two qubits in general N-qubit Wstate is only related to their coefficients and we successfully apply the general N-qubit W state to quantum state transferand quantum state prepare like that in two-qubit system.
基金the National Science Foundation of China under Grant(No.10574001)the Program of the Education Department of Anhui Province (2004kj029)the Talent Foundation of Anhui University
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.60677001,10747146,and 10874122)+4 种基金the Science-Technology Fund of Anhui Province for Outstanding Youth (Grant No.06042087)the Key Fund of the Ministry of Education of China (Grant No.206063)the General Fund of the Educational Committee of Anhui Province (Grant No.2006KJ260B)the Natural Science Foundation of Guangdong Province of China (Grant Nos.06300345 and 7007806)the Talent Foundation of High Education of Anhui Province for Outstanding Youth (Grant No.2009SQRZ018)
文摘A symmetric and(n,n)-threshold scheme for a sender to partition his/her arbitrary single-qubit information among n recipients is proposed by using a newly constructed asymmetric(n+1)-qubit W state.Both the scheme in some given scenarios and the new W state are also discussed given.
基金Supported by the National Natural Science Foundation of China under Grant No.11004258Fundamental Research Funds for the Central Universities Project under Grant No.CQDXWL-2012-014
文摘We present an efficient and simple protocol to unambiguously distinguish 2Nmutual orthogonal N-qubit Greenberger–Horne–Zeilinger states in polarization degree of freedom assisted by the frequency one. This scheme is based on N single photon Bell state measurements, which can be implemented non-locally. The success probability is100% in principle and our scheme is feasible with current technology. All the advantages make our protocol meaningful and practical in quantum information processing.
