Suppression of 1/fα noise in one-qubit systems

Pekko Kuopanportti*, Mikko Möttönen, Ville Bergholm, Olli Pentti Saira, Jun Zhang, K. Birgitta Whaley

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

33 Citations (Scopus)


We investigate the generation of quantum operations for one-qubit systems under classical Markovian noise with a 1/ power spectrum, where 2>α>0. We present an efficient way to approximate the noise with a discrete multistate Markovian fluctuator. With this method, the average temporal evolution of the qubit state operator under 1/ 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.

Original languageEnglish
Article number032334
JournalPhysical Review A - Atomic, Molecular, and Optical Physics
Issue number3
Publication statusPublished - 20 Mar 2008
MoE publication typeA1 Journal article-refereed

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