Semiconductor Quantum Chip Research Reproduces "Black Technology"

On January 2, the reporter learned from CUKU that Guo Guoping, a key member of the CAS Key Laboratory of Quantum Information, under the leadership of Academician Guo Guangcan, made a breakthrough in semiconductor quantum chip research. They introduced the third quantum dot as a control parameter , Under the premise of ensuring the coherence of the new hybrid QDs, the controllability of the hybrid QDs is greatly enhanced.

Due to the complex environment of the solid-state system, the ultra-fast manipulation of quantum bits and the long coherence often can not have both.In order to improve the controllability of the hybrid quantum bits of the semiconductor quantum chips, Guo Guoping Group applied the asymmetric ideas to the original Double quantum dot structure extended to a linearly coupled triple quantum dot system.They calculated by theoretical analysis found that when the intermediate quantum dots and the quantum dots on both sides of the coupling intensity asymmetry, the electron in the double quantum point evolution of the energy level structure can be Three quantum dots efficiently 'indirectly' regulate.

In the experiment, they first prepared the asymmetric three-quantum dot structure by semi-conductor nanofabrication process, then solved the problem of multi-electron energy level structure complexity by using electron atomic shell structure filling principle, In the case of bit coherence time, by adjusting the electrode voltage of the third quantum dot, it is clearly observed that the bit level is continuously adjustable in the 2-15 GHz range.

The achievement is published in the latest issue of Applied Physics Review, the top issue of international applied physics, which provides a new regulation idea for semiconductor quantum computing.