Ultrafast coherent excitation of a Ca${}^{+}$ ion

Abstract

Trapped ions are a well-studied and promising system for the realization of a scalable quantum computer. Faster quantum gates would greatly improve the applicability of such a system and allow for greater flexibility in the number of calculation steps. In this paper we present a pulsed laser system, delivering picosecond pulses at a repetition rate of 5 GHz and resonant to the S${}_{1/2}$ to P${}_{3/2}$ transition in Ca${}^{+}$ for coherent population transfer to implement fast phase gate operations. The optical pulse train is derived from a mode-locked, stabilized optical frequency comb and inherits its frequency stability. Using a single trapped ion, we implement three different techniques for measuring the ion-laser coupling strength and characterizing the pulse train emitted by the laser, and show how all requirements can be met for an implementation of a fast phase gate operation.

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• Fast mixed-species quantum logic gates for trapped-ion quantum networks
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• High-speed and high-connectivity two-qubit gates in long chains of trapped ions
• Error-Resilient Fast Entangling Gates for Scalable Ion-Trap Quantum Processors