Ultrafast Gates for Single Atomic Qubits
Wesley C. Campbell, Jonathan Mizrahi, Qudsia Sara Quraishi, Crystal Senko, David Hayes, David Hucul, Dzmitry Matsukevich, Peter Maunz, Christopher R. Monroe · Physical Review Letters · 2010
We demonstrate single-qubit operations on a trapped atom hyperfine qubit using a single ultrafast pulse from a mode-locked laser. We shape the pulse from the laser and perform a π rotation of the qubit in less than 50 ps with a population transfer exceeding 99% and negligible effects from spontaneous emission or ac Stark shifts. The gate time is significantly shorter than the period of atomic motion in the trap (Ω(Rabi)/ν(trap)>10(4)), demonstrating that this interaction takes place deep within the strong excitation regime.