Journal
SCIENCE ADVANCES
Volume 4, Issue 7, Pages -Publisher
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/sciadv.aat9304
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Funding
- National Key Research and Development Program of China [2017YFA0304100]
- National Natural Science Foundation of China [11374288, 11774335, 61327901, 11474268, 11325419, 11504253]
- Key Research Program of Frontier Sciences, Chinese Academy of Sciences [QYZDY-SSW-SLH00s3]
- Fundamental Research Funds for the Central Universities
- Anhui Initiative in Quantum Information Technologies [AHY020100, AHY060300]
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Quantum superdense coding protocols enhance channel capacity by using shared quantum entanglement between two users. The channel capacity can be as high as 2 when one uses entangled qubits. However, this limit can be surpassed by using high-dimensional entanglement. We report an experiment that exceeds the limit using high-quality entangled ququarts with fidelities up to 0.98, demonstrating a channel capacity of 2.09 +/- 0.01. The measured channel capacity is also higher than that obtained when transmitting only one ququart. We use the setup to transmit a five color image with a fidelity of 0.952. Our experiment shows the great advantage of high-dimensional entanglement and will stimulate research on high-dimensional quantum information processes.
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