A team headed by Professor Wu Kaifeng from the Dalian Institute of Chemical Physics (DICP) in the Chinese Academy of Sciences recently announced success in initializing, controlling, and reading out spins at room temperature using quantum dots grown in solution. This represents a significant advance
Initialization, coherent quantum-state control, and readout of spins at room temperature using solution-grown quantum dots. Credit: DICPrecently announced success in initializing, controlling, and reading out spins at room temperature using quantum dots grown in solution. This represents a significant advancement in the field of quantum information science.Quantum information science is concerned with the manipulation of the quantum version of information bits .
Colloidal quantum dots , which are tiny semiconductor nanoparticles made in solution, could be a game changer. They can be synthesized in large quantities in solution at low cost, yet with high finesse in size and shape control. Further, they are usually strongly quantum-confined, thus their carriers are well isolated from the phonon bath, which could enable long-lived spin coherence at room temperature.
“Our success here is enabled by a very rare combination of knowledge in materials, chemistry, and physics,” said Professor Wu. “We fabricated strongly- and uniformly-confined CsPbBrQDs as the unique system for the study, and identified appropriate surface-ligand molecules to rapidly extract the electrons via charge-transfer chemistry for hole-spin initialization at room temperature.
Reference: “Room-temperature coherent optical manipulation of hole spins in solution-grown perovskite quantum dots” by Xuyang Lin, Yaoyao Han, Jingyi Zhu, and Kaifeng Wu, 19 December 2022, Nature Nanotechnology.
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