Secret quantum communication of a reference frame

Abstract

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.

4 pages, no figures; published version

References in corpus (3)

• Classical and quantum communication without a shared reference frame
• Experimental Quantum Communication without a Shared Reference Frame
• Decoherence-full subsystems and the cryptographic power of a private shared reference frame

Cited by in corpus (1)

• Consistency of shared reference frames should be reexamined