Quantum dense coding with atomic qubits.
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).
Schaetz
T
T
Time and Frequency Division, NIST, Boulder, Colorado 80305-3328, USA.
Barrett
M D
MD
Leibfried
D
D
Chiaverini
J
J
Britton
J
J
Itano
W M
WM
Jost
J D
JD
Langer
C
C
Wineland
D J
DJ