title: Ultrafast gates for single atomic qubits.
abstract: 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.
authors.affiliation: Joint Quantum Institute, University of Maryland Department of Physics and National Institute of Standards and Technology, College Park, Maryland 20742 USA. wes3000@umd.edu
authors.forename: W C
authors.initials: WC
authors.lastname: Campbell
authors.forename: J
authors.initials: J
authors.lastname: Mizrahi
authors.forename: Q
authors.initials: Q
authors.lastname: Quraishi
authors.forename: C
authors.initials: C
authors.lastname: Senko
authors.forename: D
authors.initials: D
authors.lastname: Hayes
authors.forename: D
authors.initials: D
authors.lastname: Hucul
authors.forename: D N
authors.initials: DN
authors.lastname: Matsukevich
authors.forename: P
authors.initials: P
authors.lastname: Maunz
authors.forename: C
authors.initials: C
authors.lastname: Monroe