Pillars take dots to another level
InGaAs/GaAs self-assembled quantum posts could find their way into future communications technology if the work of Pierre Petroff and his group at UCSB takes off. The researchers form their nanoscale pillars by connecting a seed quantum dot (QD) to a short quantum wire and then capping the MBE-grown structure with another QD.
Petroff sees the structure as the basis for a self-contained exciton memory cell and initial results show that incoming pulses can be stored for hundreds of milliseconds without loss. His sights are set on creating a quantum repeater, although he was quick to temper any excitement with the news that such a device may be “ten years off”.
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