Secret quantum communication of a reference frame

Details Secret quantum communication of a reference frame Secret quantum communication of a reference frame

2006-08-04

arxiv.org/abs/quant-ph/0608042v2

Phys. Phys, Rev. Lett. 98, 120501 (2007)

Physics

Quantum Physics

4 pages, no figures; published version

Scientific paper

10.1103/PhysRevLett.98.120501

We propose quantum cryptographic protocols to secretly communicate a
reference frame- unspeakable information in the sense it cannot be encoded into
a string of bits. Two distant parties can secretly align their Cartesian axes
by exchanging N spin 1/2 particles, achieving the optimal accuracy 1/N. A
possible eavesdropper cannot gain any information without being detected.

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