One-Way Entangled-Photon Autocompensating Quantum Cryptography
  A new quantum cryptography implementation is presented that combines one-way operation with an autocompensating feature that has hitherto only been available in implementations that require the signal to make a round trip between the users. Using the concept of advanced waves, it is shown that this new implementation is related to the round-trip implementations in the same way that Ekert's two-particle scheme is related to the original one-particle scheme of Bennett and Brassard. The practical advantages and disadvantages of the proposed implementation are discussed in the context of existing schemes. 
Zachary D. Walton, Ayman F. Abouraddy, Alexander V. Sergienko, Bahaa   E.A. Saleh, Malvin C. Teich