Secure direct communication with a quantum one-time pad

May 17, 2004
4 pages
Published in:
  • Phys.Rev.A 69 (2004) 5, 052319
  • Published: May 17, 2004

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Abstract: (APS)
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.