Robust polarization-based quantum key distribution over collective-noise channel

Details Robust polarization-based quantum key distribution over collective-noise channel Robust polarization-based quantum key distribution over collective-noise channel

2003-06-30

arxiv.org/abs/quant-ph/0306199v2

Phys. Rev. Lett. 92, 17901 (2004)

Physics

Quantum Physics

Minor changes, added references

Scientific paper

10.1103/PhysRevLett.92.017901

We present two polarization-based protocols for quantum key distribution. The protocols encode key bits in noiseless subspaces or subsystems, and so can function over a quantum channel subjected to an arbitrary degree of collective noise, as occurs, for instance, due to rotation of polarizations in an optical fiber. These protocols can be implemented using only entangled photon-pair sources, single-photon rotations, and single-photon detectors. Thus, our proposals offer practical and realistic alternatives to existing schemes for quantum key distribution over optical fibers without resorting to interferometry or two-way quantum communication, thereby circumventing, respectively, the need for high precision timing and the threat of Trojan horse attacks.

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