Experimental demonstration of decoherence-free one-way information transfer

Phys Rev Lett. 2007 Dec 21;99(25):250503. doi: 10.1103/PhysRevLett.99.250503. Epub 2007 Dec 19.


We report the experimental demonstration of a one-way quantum protocol reliably operating in the presence of decoherence. Information is protected by designing an appropriate decoherence-free sub-space for a cluster state resource. We demonstrate our scheme in an all-optical setup, encoding the information into the polarization states of four photons. A measurement-based one-way information-transfer protocol is performed with the photons exposed to severe symmetric phase-damping noise. Remarkable protection of information is accomplished, delivering nearly ideal outcomes.