Classical and quantum communication without a shared reference frame

R. W. Spekkens; Stephen D. Bartlett; Terry Rudolph

Classical and quantum communication without a shared reference frame

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arxiv quant-ph/0302111 v3 pith:NO6RRJ7D submitted 2003-02-14 quant-ph

Stephen D. Bartlett , Terry Rudolph , R. W. Spekkens This is my paper · ORCID

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We show that communication without a shared reference frame is possible using entangled states. Both classical and quantum information can be communicated with perfect fidelity without a shared reference frame at a rate that asymptotically approaches one classical bit or one encoded qubit per transmitted qubit. We present an optical scheme to communicate classical bits without a shared reference frame using entangled photon pairs and linear optical Bell state measurements.

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Doubly Quantum Mechanics
quant-ph 2024-12 conditional novelty 6.0 of 10

Replacing SU(2) with SU_q(2) turns measurement probabilities into operators and makes reference-frame alignment between two observers fundamentally imprecise even in the limit of infinitely many exchanged spins.

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