1Laboratory of Quantum Communication and Quantum
Computation, University of Science and Technology of China, Hefei 230026
2Department of Physics, Wenzhou Normal College, Wenzhou 325027
3Department of Physics, Weifang University, Weifang 261043
Remote State Preparation via a Non-Maximally Entangled Channel
ZHENG Yi-Zhuang1,2;GU Yong-Jian1,3;GUO Guang-Can1
1Laboratory of Quantum Communication and Quantum
Computation, University of Science and Technology of China, Hefei 230026
2Department of Physics, Wenzhou Normal College, Wenzhou 325027
3Department of Physics, Weifang University, Weifang 261043
Abstract： We investigate remote state preparation (RSP) via a non-maximally entangled channel for three cases: a general qubit, a special ensemble of qubits (qubit states on the equator of the Bloch sphere) and asymptotic limit of N copies of a general state. The results show that the classical communication cost of RSP for the two latter cases can be less than that of teleportation, but for the first case, in a restricted setting, the classical communication cost is equal to that of teleportation. Whether or not this is the case for more general setting is still an open question.
2002, Vol. 19 
