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Secure direct communication with a quantum one-time pad

2004; American Physical Society; Volume: 69; Issue: 5 Linguagem: Inglês

10.1103/physreva.69.052319

1538-4446

Fu‐Guo Deng, Gui‐Lu Long,

Quantum Mechanics and Applications

Quantum secure direct communication is the direct communication of secret messages without first producing a shared secret key. It may be used in some urgent circumstances. Here we propose a quantum secure direct communication protocol using single photons. The protocol uses batches of single photons prepared randomly in one of four different states. These single photons serve as a one-time pad which is used directly to encode the secret messages in one communication process. We also show that it is unconditionally secure. The protocol is feasible with present-day technique.