The probabilistic quantum teleportation scheme [Phys.Lett.A 305 (2002) 12] is improved via twoseemingly different methods (i.e., the usual ancilla method and the so-called Kraus method), respectively.The essenceof the...The probabilistic quantum teleportation scheme [Phys.Lett.A 305 (2002) 12] is improved via twoseemingly different methods (i.e., the usual ancilla method and the so-called Kraus method), respectively.The essenceof the improvements is to fetch a part from the residues so that the success probability is accordingly increased.The twoimproved versions and a similar protocol proposed by Li et al.[Phys.Rev.A 61 (2000) 034301] are compared mutuallyand discussed.It is found that they are equally efficient and can reach the success probability threshold determined bythe inherent entanglement of the quantum channel.展开更多
Teleportation of a qubit with two partially entangled qubit states linking three nodes as quantum channels isextensively studied via the usual ancilla method.With the method two realization approaches, i.e., the node ...Teleportation of a qubit with two partially entangled qubit states linking three nodes as quantum channels isextensively studied via the usual ancilla method.With the method two realization approaches, i.e., the node progressionapproach and the global accumulation approach, are presented.Their resource consumptions, operation complexities,and efficiencies are evaluated and compared.It is found that the latter approach is better than the former one besides theerror is partially self-corrected.The latter approach is further improved so that two merits are resultant.The improvedversion is compared with a similar protocol [M.Y.Wang and F.L.Yan, Eur.Phys.J.D 54 (2009) 111].Their meritsand additional costs are exposed.展开更多
Quantum correlations in a family of two-qubit separable classical-quantum correlated states are intensively studied with four diferent approaches,namely,quantum discord[Phys.Rev.Lett.88(2002)017901],measurementinduced...Quantum correlations in a family of two-qubit separable classical-quantum correlated states are intensively studied with four diferent approaches,namely,quantum discord[Phys.Rev.Lett.88(2002)017901],measurementinduced disturbance(MID)[Phys.Rev.A 77(2008)022301],ameliorated MID[J.Phys.A:Math.Theor.44(2011)352002]and quantum dissonance[Phys.Rev.Lett.104(2010)080501].Quantum correlations captured with diferent approaches are compared and discussed so that their three distinct features are exposed.展开更多
基金Supported by the Program for New Century Excellent Talents at the University of China under Grant No.NCET-06-0554the National Natural Science Foundation of China under Grant Nos.10975001,60677001,10747146,and 10874122+3 种基金the Science-Technology Fund of Anhui Province for Outstanding Youth under Grant No.06042087the General Fund of the Educational Committee of Anhui Province under Grant No.2006KJ260Bthe Natural Science Foundation of Guangdong Province under Grant Nos.06300345 and 7007806 the Talent Foundation of High Education of Anhui Province for Outstanding Youth under Grant No.2009SQRZ018
文摘The probabilistic quantum teleportation scheme [Phys.Lett.A 305 (2002) 12] is improved via twoseemingly different methods (i.e., the usual ancilla method and the so-called Kraus method), respectively.The essenceof the improvements is to fetch a part from the residues so that the success probability is accordingly increased.The twoimproved versions and a similar protocol proposed by Li et al.[Phys.Rev.A 61 (2000) 034301] are compared mutuallyand discussed.It is found that they are equally efficient and can reach the success probability threshold determined bythe inherent entanglement of the quantum channel.
基金Supported by the program for New Century Excellent Talents at the University of China under Grant No.NCET-06-0554the National Natural Science Foundation of China under Grant Nos.10975001,60677001,10747146,and 10874122+3 种基金the science-technology fund of Anhui province for outstanding youth under Grant No.06042087 the general fund of the educational committee of Anhui province under Grant No.2006KJ260Bthe Talent Foundation of High Education of Anhui Province for Outstanding Youth under Grant No.2009SQRZ018the Natural Science Foundation of Guangdong Province under Grant Nos.06300345 and 7007806
文摘Teleportation of a qubit with two partially entangled qubit states linking three nodes as quantum channels isextensively studied via the usual ancilla method.With the method two realization approaches, i.e., the node progressionapproach and the global accumulation approach, are presented.Their resource consumptions, operation complexities,and efficiencies are evaluated and compared.It is found that the latter approach is better than the former one besides theerror is partially self-corrected.The latter approach is further improved so that two merits are resultant.The improvedversion is compared with a similar protocol [M.Y.Wang and F.L.Yan, Eur.Phys.J.D 54 (2009) 111].Their meritsand additional costs are exposed.
基金Supported by the Specialized Research Fund for the Doctoral Program of Higher Education under Grant No.20103401110007the National Natural Science Foundation of China under Grant Nos.10874122,10975001,51072002,51272003+1 种基金the Program for Excellent Talents at the University of Guangdong,(Guangdong Teacher Letter[1010]No.79)the 211 Project of Anhui University
文摘Quantum correlations in a family of two-qubit separable classical-quantum correlated states are intensively studied with four diferent approaches,namely,quantum discord[Phys.Rev.Lett.88(2002)017901],measurementinduced disturbance(MID)[Phys.Rev.A 77(2008)022301],ameliorated MID[J.Phys.A:Math.Theor.44(2011)352002]and quantum dissonance[Phys.Rev.Lett.104(2010)080501].Quantum correlations captured with diferent approaches are compared and discussed so that their three distinct features are exposed.
