Communications of the ACM
Joining the Dots For Quantum Computing
Electrode-defined quantum dots provide a scalable architecture for quantum information processing by trapping electrons and controlling their spin state, either up (red) or down (blue).
Credit: Matthieu Delbecq and Shinichi Amaha, RIKEN Center for Emergent Matter Science
Researchers at Japan's RIKEN Center for Emergent Matter Science and Purdue University say they have demonstrated the scalability of quantum dot architectures by trapping and controlling four electrons in a single device.
Although scientists have fabricated two- and three-quantum dot devices in the past, the RIKEN and Purdue researchers say they are the first to create a four-quantum-dot structure, proving the scalability of the architecture. "The number of manipulated electrons is increased only by one with respect to previous structures, but even a small increase in the number of electrons significantly increases the complexity of device manipulation," says RIKEN's Matthieu Delbecq.
For the new device, each of the dots was formed by three nanoscale metallic electrodes on a semiconductor substrate. "The next step is to form four spin qubits with this architecture and use them to actually perform computations," Delbecq says. He says the results demonstrate quantum dot architecture has the potential to be scaled up to the number of qubits needed to realize a fully functional quantum computer.
From RIKEN
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