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Experimental demonstration of quantum source coding

Mitsumori, Y. and Vaccaro, J.A. and Barnett, S.M. and Andersson, E. and Hasegawa, A. and Takeoka, M. and Sasaki, M. (2003) Experimental demonstration of quantum source coding. Physical Review Letters, 91 (21). pp. 217902-1. ISSN 0031-9007

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We report an experimental demonstration of Schumacher's quantum noiseless coding theorem. Our experiment employs a sequence of single photons, each of which represents three qubits in terms of eight spatial and polarization modes. We initially prepare each photon in one of a set of eight nonorthogonal code word states corresponding to the value of a block of three binary letters. We use quantum coding to compress this quantum data into a two-qubit quantum channel and then uncompress the two-qubit channel to restore the original data with a fidelity approaching the theoretical limit.