Quantum Dense Coding with Atomic Qubits
Tobias Schaetz, M. D. Barrett, D. Leibfried, John Chiaverini, J. Britton, Wayne M. Itano, John D. Jost, C. Langer, D. J. Wineland · Physical Review Letters · 2004
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).