In a process of remote state preparation, the universality of quantum channel is is, one quantum channel should be feasible to remotely prepare any given qubit an essential ingredient. That state. This problem appears...In a process of remote state preparation, the universality of quantum channel is is, one quantum channel should be feasible to remotely prepare any given qubit an essential ingredient. That state. This problem appears in a process where one uses non-maximally entangled state as the passage. We present a scheme in which any given qubit ｜φ） = cosθ｜0） ＋ sinθe^iψ｜1） could be remotely prepared by using minimum classical bits and the previously shared non-maximally entangled state with a high fldelity, under the condition that the receiver holds the knowledge of θ. This condition is helpful to reduce the necessary amount of quantum channels, which is proven to be a low quantity to realize the universality. We also give several methods to investigate the trade-off between this amount and the achievable fidelity of the protocol展开更多
At zero temperature, based on the Ising model, the phase transition in a two-dimensional square lattice is studied using the generalized zero-temperature Glauber dynamics. Using Monte Carlo （MC） renormalization grou...At zero temperature, based on the Ising model, the phase transition in a two-dimensional square lattice is studied using the generalized zero-temperature Glauber dynamics. Using Monte Carlo （MC） renormalization group methods, the static critical exponents and the dynamic exponent are studied; the type of phase transition is found to be of the first order.展开更多
基金Supported by the National Natural Science Foundation of China under Grant No 90503009, the Natural Science Foundation of Zhejiang Province, and the National Key Basic Research and Development Programme of China under Grant No under Grant No 2005CB724508.
文摘In a process of remote state preparation, the universality of quantum channel is is, one quantum channel should be feasible to remotely prepare any given qubit an essential ingredient. That state. This problem appears in a process where one uses non-maximally entangled state as the passage. We present a scheme in which any given qubit ｜φ） = cosθ｜0） ＋ sinθe^iψ｜1） could be remotely prepared by using minimum classical bits and the previously shared non-maximally entangled state with a high fldelity, under the condition that the receiver holds the knowledge of θ. This condition is helpful to reduce the necessary amount of quantum channels, which is proven to be a low quantity to realize the universality. We also give several methods to investigate the trade-off between this amount and the achievable fidelity of the protocol
文摘At zero temperature, based on the Ising model, the phase transition in a two-dimensional square lattice is studied using the generalized zero-temperature Glauber dynamics. Using Monte Carlo （MC） renormalization group methods, the static critical exponents and the dynamic exponent are studied; the type of phase transition is found to be of the first order.
