Interband transitions and interference effects in superconducting qubits
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- Paila, A., Tuorila, J., Sillanpää, M. et al. Quantum Inf Process (2009) 8: 245. doi:10.1007/s11128-009-0102-4
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We investigate phase-sensitive interference effects in a periodically sin(2π frft)-driven, artificial two-state system connected to a microwave resonator at fLC ≃ 800 MHz. We observe two kinds of multiphoton transitions in the two-state system, accompanied by: (1) Several quanta from the drive at frf and (2) one quantum at frf and several at fLC. 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.