Experimental fault-tolerant quantum cryptography in a decoherence-free subspace
- 8 February 2006
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review A
- Vol. 73 (2), 020301
- https://doi.org/10.1103/physreva.73.020301
Abstract
We experimentally implement a fault-tolerant quantum key distribution protocol with two photons in a decoherence-free subspace [Phys. Rev. A 72, 050304(R) (2005)]. It is demonstrated that our protocol can yield a good key rate even with a large bit-flip error rate caused by collective rotation, while the usual realization of the Bennett-Brassard 1984 protocol cannot produce any secure final key given the same channel. Since the experiment is performed in polarization space and does not need the calibration of a reference frame, important applications in free-space quantum communication are expected. Moreover, our method can also be used to robustly transmit an arbitrary two-level quantum state in a type of decoherence-free subspace.Keywords
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