Designing Robust Unitary Gates: Application to Concatenated Composite Pulse

Details Designing Robust Unitary Gates: Application to Concatenated Composite Pulse Designing Robust Unitary Gates: Application to Concatenated Composite Pulse

2011-05-04

arxiv.org/abs/1105.0744v3

Phys. Rev. A 84 (2011) 062311

Physics

Quantum Physics

7 pages, 4 figures. Major revision: improved presentation in Sec. 3, references and appendix added

Scientific paper

10.1103/PhysRevA.84.062311

We propose a simple formalism to design unitary gates robust against given systematic errors. This formalism generalizes our previous observation [Y. Kondo and M. Bando, J. Phys. Soc. Jpn. 80, 054002 (2011)] that vanishing dynamical phase in some composite gates is essential to suppress amplitude errors. By employing our formalism, we naturally derive a new composite unitary gate which can be seen as a concatenation of two known composite unitary operations. The obtained unitary gate has high fidelity over a wider range of the error strengths compared to existing composite gates.

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