Coherent excitation and stimulated emission from optical transitions has been proposed as a mechanism to generate strong coherent forces in atomic systems and as the basis for fast quantum gates in trapped ions. We have demonstrated driving coherent oscillations between the 2S1/2 and 2P1/2 states in trapped 171Yb+ with 2.5 ps pulses straddling the resonance at 369.5nm. At higher powers nearly full extinction was observed, demonstrating coherence, however residual detuning issues have precluded full coherent population transfer.
Quantum communication requires long-lived memories and robust communication qubits. Long-lived memories and high fidelity two qubit gates are demonstrated using atomic qubits. Frequency qubits are shown to be robust against noises present in long distance communications. In this project we are working towards using trapped 171Yb+ ions as memory qubits and frequency encoded photonic qubits as communication qubits to realise long distance quantum communication protocols.