Research On QIC Based On The Phase Covariant Cloning

Quantum communication is a new frontier science which combines classical information with quantum mechanics.With the help of the basic principles of quantum mechan-ics,quantum communication has the high efficiency and absolute security that the traditional way of communication lacks.Nowadays,many countries give priority to the research of quan-tum communication and make it more practical.Therefore,as an important branch of quantum informatics,quantum communication has a very important research value.This paper mainly studies the quantum remote information concentration protocol based on phase covariant clone state.The main research contents are as follows:1.Remote information concentration based on maximally entangled |?>state.The max-imally entangled |?>state is used as the channel,the quantum information distributed in the optimal asymmetric economical phase-covariant clone state will be collected into a single par-ticle state by using projection measurement or POVM measurement.Furthermore,we analyze the physical realization and the security of our scheme.2.Simultaneous remote information concentration based on the phase covariant cloning.Using the tensor product of the 4 particle cluster state and a 3 particle entangled state as quantum channels,two controlled simultaneous quantum information concentration protocol-s are designed.That is to say,all participants share one channel,with the permission of the controller,two quantum remote information concentration process can be realized,so that the information of both clones can be restored.The channels of the two protocols are different,but using projection measurement or POVM measurement can achieve the simultaneous quan-tum information concentration task with a certain probability,the maximum probability of the success of the protocol is 1.3.Analysis of the control power of simultaneous quantum information concentration pro-tocol.With the method of unconditional fidelity,we analyzes the control power of the two protocols.The results show that the second protocol is better than the first one in terms of con-troller power.The reason for this result is that the quantum channels are different,so the choice of quantum channel is very important,it is directly related to the success of the protocol,the probability of success,and whether the protocol is perfect.