Controlled Quantum Coherences of Nuclear Spins in a Nanoscale Device
Controlled quantum coherence of nuclear spins has been demonstrated by using a semiconductor point contact device. These figures show the semiconductor chip used in the experiment, schematic diagram of the nanodevice incorporated inside, and color plot of the variation in the resistance of the nanodevice measured near the NMR resonance frequency of As. Various quantum-mechanical transitions between four states, which are typical of As, are controlled with high precision, and clear oscillation is observed.(Page 36)