| Budget Amount *help |
¥4,940,000 (Direct Cost: ¥3,800,000、Indirect Cost: ¥1,140,000)
Fiscal Year 2014: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
Fiscal Year 2013: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
Fiscal Year 2012: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
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| Outline of Final Research Achievements |
Superconducting qubits consisting of ultrasmall Josephson junctions have attracted much interest for the implementation of a scalable quantum computer. We investigated a superconducting flux qubit strongly coupled to a DC-SQUID that is used for readout of the qubit. Higher-order red and blue sideband transitions were clearly observed in spectroscopic measurement. The origin of these transitions was found to be a SQUID plasma mode. Manipulation of the quantum states was demonstrated as Rabi oscillations on the carrier transition and sideband transitions. The observation of the sidebands up to |M| = 3, where M represents the change in the quantum number of the resonator state, is consistent with the calculated transition matrix elements between the quantum states of the coupled system. Our results may provide a basis for future experiments manipulating many composite levels, including demonstration of quantum gates using sideband transitions.
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