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Phys Rev Lett. 2004 Jul 23;93(4):040505. Epub 2004 Jul 22.

Quantum dense coding with atomic qubits.

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Time and Frequency Division, NIST, Boulder, Colorado 80305-3328, USA.


We report the implementation of quantum dense coding on individual atomic qubits with the use of two trapped 9Be+ ions. The protocol is implemented with a complete Bell measurement that distinguishes the four operations used to encode two bits of classical information. We measure an average transmission fidelity of 0.85(1) and determine a channel capacity of 1.16(1).

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