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Monday, 02 March, 2009

Optimal Control of a Qubit Coupled to a Non-Markovian Environment

P. Rebentrost, I. Serban, T. Schulte-Herbr├╝ggen and F. K. Wilhelm -
Phys. Rev. Lett. 102, 090401 (2009)

A central challenge for implementing quantum computing in the solid state is decoupling the qubits from the intrinsic noise of the material. We investigate the implementation of quantum gates for a paradigmatic, non-Markovian model: a single-qubit coupled to a two-level system that is exposed to a heat bath. We systematically search for optimal pulses using a generalization of the novel open systems gradient ascent pulse engineering algorithm. Next to the known optimal bias point of this model, there are optimal pulses which lead to high-fidelity quantum operations for a wide range of decoherence parameters.

 

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