Abstract
We investigate phase-sensitive interference effects in a periodically sin(2π f rf t)-driven, artificial two-state system connected to a microwave resonator at f LC ≃ 800 MHz. We observe two kinds of multiphoton transitions in the two-state system, accompanied by: (1) Several quanta from the drive at f rf and (2) one quantum at f 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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This work was financially supported by the Academy of Finland, the Finnish Cultural Foundation, the Magnus Ehrnrooth Foundation, the Vaisala Foundation of the Finnish Academy of Science and Letters, EU-INTAS 05-10000008-7923, the Dynasty foundation, the presidential Grant MD-4092.2007.2, and the EC-funded ULTI Project (Contract RITA-CT-2003-505313).
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Paila, A., Tuorila, J., Sillanpää, M. et al. Interband transitions and interference effects in superconducting qubits. Quantum Inf Process 8, 245–259 (2009). https://doi.org/10.1007/s11128-009-0102-4
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DOI: https://doi.org/10.1007/s11128-009-0102-4
Keywords
- Landau–Zener tunneling
- Superconducting qubits
- Multiphoton transitions
- Franck–Condon physics
- Aharonov–Anandan phase