Research On Controlled Quantum Communication Schemes In High-dimensional Space

As important parts of quantum communication,quantum teleportation and quantum security direct communication(QSDC)have certain theoretical value and good application prospects.In this paper,two aspects of quantum communication were studied,the controlled quantum teleportation and QSDC in high-dimensional systems,the main research contents are as follows:1.Asymmetric controlled bidirectional teleportation in high-dimensional systems.Using high-dimensional entangled quantum states as channels,an asymmetric controlled bidirectional teleportation scheme is proposed and optimized.Firstly,we constructed a seven-particle quantum channel;then,under the supervision of the controller,the senders respectively transmited a single(two)-particle state in high-dimensional space to each other by different choices of measurement basis and the distribution of entangled particles.By optimizing the measurement basis,the improved scheme increased the probability of successful transmission to 100%.2.Controlled QSDC in high-dimensional systems.This paper proposed the controlled QSDC scheme in high-dimensional systems which use four-particle states as detection particles.Firstly,the communication parties have ensured the safety of the channel.Then,after encoding transmitted message sequences,the sender and the controller performed single-particle measurement of the particles they own.The receiver can successfully recover the secret information by obtaining the measurement results from the sender and the controller.It is showed that this scheme is highly secure,and can effectively protect against eavesdropping attacks.