Physics – Quantum Physics
Scientific paper
2007-09-11
Phys. Rev. A 76, 042325 (2007)
Physics
Quantum Physics
12 pages, 7 figures, to appear in Phys. Rev. A
Scientific paper
10.1103/PhysRevA.76.042325
We investigate quantum teleportation through dissipative channels and calculate teleportation fidelity as a function of damping rates. It is found that the average fidelity of teleportation and the range of states to be teleported depend on the type and rate of the damping in the channel. Using the fully entangled fraction, we derive two bounds on the damping rates of the channels: one is to beat the classical limit and the second is to guarantee the non-existence of any other copy with better fidelity. Effect of the initially distributed maximally entangled state on the process is presented; and the concurrence and the fully entangled fraction of the shared states are discussed. We intend to show that prior information on the dissipative channel and the range of qubit states to be teleported is helpful for the evaluation of the success of teleportation, where success is defined as surpassing the fidelity limit imposed by the fidelity of 1-to-2 optimal cloning machine for the specific range of qubits.
Bartkiewicz Karol
Liu Yu-xi
Miranowicz Adam
Ozdemir Sahin Kaya
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