Monday, 02 March, 2009
Optimal Control of a Qubit Coupled to a Non-Markovian Environment
P. Rebentrost, I. Serban, T. Schulte-Herbrüggen 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.