【摘 要】
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Quantum secure direct communication (QSDC) attracts much attention for it can transmit secret mes-sages directly without sharing a key.In this article,we propose a one-step QSDC protocol,which only requires to distribute polarization-spatial-mode hyperent
【机 构】
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College of Electronic and Optical Engineering & College of Microelectronics,Nanjing University of Po
论文部分内容阅读
Quantum secure direct communication (QSDC) attracts much attention for it can transmit secret mes-sages directly without sharing a key.In this article,we propose a one-step QSDC protocol,which only requires to distribute polarization-spatial-mode hyperentanglement for one round.In this QSDC protocol,the eavesdropper cannot obtain any message,so that this protocol is unconditionally secure in principle.This protocol is a two-way quantum communication and has high capacity for it can transmit two bits of secret messages with one pair of hyperentanglement.With entanglement fidelities of both polarization and spatial-mode degrees of freedom being 0.98,the maximal communication distance of this one-step QSDC can reach about 216 km.QSDC can also be used to generate the key.In this regard,the key generation rate is estimated about 2.5 times of that in the entanglement-based QKD with the communi-cation distance of 150 km.With the help of future quantum repeaters,this QSDC protocol can provide unconditionally secure communication over arbitrarily long distance.
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