Correcting errors in a quantum gate with pushed ions via optimal control

Details Correcting errors in a quantum gate with pushed ions via optimal control Correcting errors in a quantum gate with pushed ions via optimal control

2009-10-23

arxiv.org/abs/0910.4495v3

Phys. Rev A, vol 82, 012339 (2010)

Physics

Quantum Physics

Published i PRA

Scientific paper

10.1103/PhysRevA.82.012339

We analyze in detail the so-called "pushing gate" for trapped ions, introducing a time dependent harmonic approximation for the external motion. We show how to extract the average fidelity for the gate from the resulting semi-classical simulations. We characterize and quantify precisely all types of errors coming from the quantum dynamics and reveal for the first time that slight nonlinearities in the ion-pushing force can have a dramatic effect on the adiabaticity of gate operation. By means of quantum optimal control techniques, we show how to suppress each of the resulting gate errors in order to reach a high fidelity compatible with scalable fault-tolerant quantum computing.

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