Improving quantum gate fidelities using optimized Euler angles

Details Improving quantum gate fidelities using optimized Euler angles Improving quantum gate fidelities using optimized Euler angles

2008-05-19

arxiv.org/abs/0805.2894v3

Phys. Rev. A 80, 052329 (2009)

Physics

Quantum Physics

approx. 11 pages, 3 figures, 1 table

Scientific paper

10.1103/PhysRevA.80.052329

An explicit algorithm for calculating the optimized Euler angles for both qubit state transfer and gate engineering given two arbitary fixed Hamiltonians is presented. It is shown how the algorithm enables us to efficiently implement single qubit gates even if the control is severely restricted and the experimentally accessible Hamiltonians are far from orthogonal. It is further shown that using the optimized Euler angles can significantly improve the fidelity of quantum operations even for systems where the experimentally accessible Hamiltonians are nearly orthogonal. Unlike schemes such as composite pulses, the proposed scheme does not significantly increase the number of local operations or gate operation times.

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