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

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• Variational secure cloud quantum computing
• An information entropy interpretation of photon absorption by dielectric media
• Secure alignment of coordinate systems by using quantum correlation
• Anonymous estimation of intensity distribution of magnetic fields with quantum sensing network