Suppression of 1/f noise in one-qubit systems

Details Suppression of 1/f noise in one-qubit systems Suppression of 1/f noise in one-qubit systems

2007-04-05

arxiv.org/abs/0704.0771v1

Phys. Rev. A 77, 032334 (2008)

Physics

Quantum Physics

8 pages, 7 figures

Scientific paper

10.1103/PhysRevA.77.032334

We investigate the generation of quantum operations for one-qubit systems under classical noise with 1/f^\alpha power spectrum, where 2>\alpha > 0. We present an efficient way to approximate the noise with a discrete multi-state Markovian fluctuator. With this method, the average temporal evolution of the qubit density matrix under 1/f^\alpha noise can be feasibly determined from recently derived deterministic master equations. We obtain qubit operations such as quantum memory and the NOT}gate to high fidelity by a gradient based optimization algorithm. For the NOT gate, the computed fidelities are qualitatively similar to those obtained earlier for random telegraph noise. In the case of quantum memory however, we observe a nonmonotonic dependency of the fidelity on the operation time, yielding a natural access rate of the memory.

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