【摘 要】
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The security of quantum communication is based on the laws of quantum mechanics,which can resist attacks from any powerful classical and quantum computers.It has great potential in secure communication in the future.One well-known form of quantum communic
【机 构】
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State Key Laboratory of Low-dimensional Quantum Physics and Department of Physics,Tsinghua Universit
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The security of quantum communication is based on the laws of quantum mechanics,which can resist attacks from any powerful classical and quantum computers.It has great potential in secure communication in the future.One well-known form of quantum communication is quantum key distribution(QKD),where random numbers are transmitted in the quantum channel to generate a shared key between two remote parties.The key is used to encrypt the message into ciphertext which is transmitted to the receiver through a classical channel.In the beginning of the new millen-nium,quantum secure direct communication(QSDC),a form of quantum communication that transmits information directly over a quantum channel,was proposed[1,2].QSDC is different from quantum key distribution.QSDC can be constructed by using entangled quantum states,such as LL00 protocol[1,2]and the two-step protocol[3],or by using non-entangled quantum states,such as DL04 protocol[4].Proof-of-principle experiments of the DL04 single-photon protocol was completed in 2016[5],and the EPR-pair based LL00 and two-step protocols were demonstrated in 2017 using state-of-the-arts quantum memory[6],and fibre based entangled source[7],respectively.
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