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Secret quantum communication of a reference frame
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classification
quant-ph
keywords
cannotinformationquantumreferencesecretlyaccuracyachievingalign
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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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