Abstract
Fast entangling quantum gates can significantly enhance the performance of a trapped-ion quantum computer. In pursuit of implementing a fast two-qubit gate, we investigate the coherent excitation of a 40Ca+ ion with a train of picosecond pulses resonant to the 4S1/2 4P3/2 transition. The optical pulse train is derived from a mode-locked, stabilized optical frequency comb. We implement two techniques to characterize the pulse-ion interaction and show how all requirements can be met for an implementation of a fast phase gate operation.
Highlights
Trapped ions are a promising system for the implementation of a scalable quantum computer [1, 2, 3, 4, 5]
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
For the same reason the experiment does not necessitate the use of a pulse picker that is faster than the fundamental repetition rate
Summary
Trapped ions are a promising system for the implementation of a scalable quantum computer [1, 2, 3, 4, 5]. The entangling gate operations in these experiments rely on spectroscopically-resolved motional sidebands of the ion crystals, a requirement that limits the duration of a gate operation to more than the period of motion of the ions in the trap (typically a few μs or more). Overcoming this limitation would advance the development of a scalable quantum computer as it would allow one to increase the number of gate operations (computational steps) that can be completed within the coherence time of the ion-qubits. Creation of two-qubit entanglement by a train of ultrafast laser pulses within a few microseconds has been demonstrated in the ground-states of a pair of Yb+ ions [19]
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