Interband transitions and interference effects in superconducting qubits

Details Interband transitions and interference effects in superconducting qubits Interband transitions and interference effects in superconducting qubits

2009-01-09

arxiv.org/abs/0901.1304v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

13 pages, 7 figures, to appear in QIP special issue on superconducting quantum computing

Scientific paper

We investigate phase-sensitive interference effects in a periodically $\sin(2\pi f_{\rm rf} t)$-driven, artificial two-state system connected to a microwave resonator at $f_{LC} \simeq 800$ MHz. We observe two kinds of multiphoton transitions in the two-state system, accompanied by: 1) Several quanta from the drive at $f_{\rm rf}$ and 2) one quantum at $f_{\rm rf}$ and several at $f_{LC}$. The former are described using phase-sensitive Landau-Zener transitions, while the latter are discussed in terms of vibronic transitions in diatomic molecules. Interference effects in the vibronic transitions governed by Franck-Condon coefficients are also considered.

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