Quantum Communication Based on Decoherence Suppression Via Weak Measurement and Environment-Assisted Measurement

In this paper, based on a remote state preparation (RSP) scheme for arbitrary single quantum bit state and a controlled quantum teleportation protocol, we discuss the decoherence suppression (DS) of weak measurement (WM) and environmentally assisted measurement (EAM). We analyze the application of the decoherence suppression strategy of WM and EAM in improving the efficiency and quality of quantum communication from the perspective of amplitude or phase damped channels. For these two types of noise, the average fidelity and the probability of success of the scheme are calculated as a function of the weak measurement before, after and the channel attenuation parameters. Provided that the decay rate of the amplitude or phase damping is completely known, one can always achieve unit fidelity even for heavy damping cases, which is the biggest advantage of proposed scheme. Influences of several paramters, including strengths of weak measurements and the decay rate of the decoherence channel, on the RSP based on decoherence suppression is discussed. The results indicate that protected CQT of an arbitrary unknown single-qubit state can be achieved with a certain probability and 100% fidelity.