Session W26: Quantum Control and Resources for Quantum Computing
11:15 AM–2:15 PM, Thursday, March 18, 2010
Room: D136
Sponsoring Unit:
GQI
Chair: Frank Wilhelm, University of Waterloo
Abstract ID: BAPS.2010.MAR.W26.2
Abstract: W26.00002 : High fidelity gates with simple pulses
11:27 AM–11:39 AM
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Abstract 
Authors:
Felix Motzoi
(University of Waterloo)
Jay Gambetta
(University of Waterloo)
Frank Wilhelm
(University of Waterloo)
Fast oscillating terms in the Hamiltonian such as off-resonant excitation and counter- rotating terms can be a significant source of error in quantum information implementations. We expand on techniques first developed for controlling 3-level systems, Derivative Removal by Adiabatic Gate (DRAG) published in PRL 103 110501, which was experimentally tested in arXiv:0908.1955v1. Here we show how this technique can be applied specifically to 2-level systems, selective qubit addressing, and in general to multi-channel leakage systems to vastly improve fidelities. In all these cases, the error corresponds to a dragging of the adiabatic frame used for the coherent rotation, which is proportional to the derivative and can easily be corrected using a second quadrature control. The pulse shapes obtained are smooth and very short in duration, corresponding to very few cycles of the unwanted fast oscillation.
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2010.MAR.W26.2