title: Ultrafast, high repetition rate, ultraviolet, fiber-laser-based source: application towards Yb+fast quantum-logic.
abstract: Trapped ions are one of the most promising approaches for the realization of a universal quantum computer. Faster quantum logic gates could dramatically improve the performance of trapped-ion quantum computers, and require the development of suitable high repetition rate pulsed lasers. Here we report on a robust frequency upconverted fiber laser based source, able to deliver 2.5 ps ultraviolet (UV) pulses at a stabilized repetition rate of 300.00000 MHz with an average power of 190 mW. The laser wavelength is resonant with the strong transition in Ytterbium (Yb+) at 369.53 nm and its repetition rate can be scaled up using high harmonic mode locking. We show that our source can produce arbitrary pulse patterns using a programmable pulse pattern generator and fast modulating components. Finally, simulations demonstrate that our laser is capable of performing resonant, temperature-insensitive, two-qubit quantum logic gates on trapped Yb+ions faster than the trap period and with fidelity above 99%.
authors.forename: Mahmood Irtiza
authors.initials: MI
authors.lastname: Hussain
authors.forename: Matthew Joseph
authors.initials: MJ
authors.lastname: Petrasiunas
authors.forename: Christopher D B
authors.initials: CD
authors.lastname: Bentley
authors.forename: Richard L
authors.initials: RL
authors.lastname: Taylor
authors.forename: André R R
authors.initials: AR
authors.lastname: Carvalho
authors.forename: Joseph J
authors.initials: JJ
authors.lastname: Hope
authors.forename: Erik W
authors.initials: EW
authors.lastname: Streed
authors.forename: Mirko
authors.initials: M
authors.lastname: Lobino
authors.forename: David
authors.initials: D
authors.lastname: Kielpinski