| Budget Amount *help |
¥196,560,000 (Direct Cost: ¥151,200,000、Indirect Cost: ¥45,360,000)
Fiscal Year 2013: ¥20,280,000 (Direct Cost: ¥15,600,000、Indirect Cost: ¥4,680,000)
Fiscal Year 2012: ¥18,720,000 (Direct Cost: ¥14,400,000、Indirect Cost: ¥4,320,000)
Fiscal Year 2011: ¥45,630,000 (Direct Cost: ¥35,100,000、Indirect Cost: ¥10,530,000)
Fiscal Year 2010: ¥62,790,000 (Direct Cost: ¥48,300,000、Indirect Cost: ¥14,490,000)
Fiscal Year 2009: ¥49,140,000 (Direct Cost: ¥37,800,000、Indirect Cost: ¥11,340,000)
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| Research Abstract |
We have succeeded for the first time to demonstrate operations combining one-qubit unitary gate and two-qubit operation of spin qubits realized in quantum dot (QD) system. By improving device design, the world fastest x-rotation (127MHz) and z-rotation (50MHz) are achieved. We designed a micro-magnet structure that enable electron dipole spin resonance operations to individual spins in multi-QD array and succeeded in controlling three spins. In an InAs QD, the strength of spin-orbit interaction and g-tensor are precisely determined and controlled by gate. Combining tunnel-coupled quantum wires and an Aharonov-Bohm ring, the control of flying qubit is realized by the two-path interferometer. Using surface acoustic wave, single electrons are coherently transferred between distance QDs with success probability more than 90 %. We developed wide-band capacitance measurement system to detect the signal related to spin triplet state in a coupled QD system.
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