Decoherence-free subspaces in quantum key distribution

Phys Rev Lett. 2003 Aug 22;91(8):087901. doi: 10.1103/PhysRevLett.91.087901. Epub 2003 Aug 20.


We demonstrate that two recent innovations in the field of practical quantum key distribution (one-way autocompensation and passive detection) are closely related to the methods developed to protect quantum computations from decoherence. We present a new scheme that combines these advantages, and propose a practical implementation of this scheme that is feasible using existing technology.