Multiphoton excitations and inverse population in two-flux-qubit system

Details Multiphoton excitations and inverse population in two-flux-qubit system Multiphoton excitations and inverse population in two-flux-qubit system

2009-08-19

arxiv.org/abs/0908.2728v2

Phys. Rev. B 81, 012506 (2010)

Physics

Condensed Matter

Superconductivity

4 pages, 2 figures; v.2: minor changes

Scientific paper

We study spectroscopy of artificial solid-state four-level quantum system. This system is formed by two coupled superconducting flux qubits. When multiple driving frequency of the applied microwaves matches the energy difference between any two levels, the transition to the upper level is induced. We demonstrate two types of the multi-photon transitions: direct transitions between two levels and ladder-type transitions via an intermediate level. For the latter transitions, in particular, the inverse population of the excited state with respect to the ground one is realized. These processes can be useful for the control of the level population for the multilevel scalable quantum systems.

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