Research On The Universal Quantum Computer Cpu Scheme Based On Quantum Dots

Quantum computing is a blooming research field both in academia and industry.The tremendous progresses in this area have attracted global attention.With the development of theory and experiments exploration,many fruitful results have been achieved in various system,such as ion trap,superconducting circuits and semiconductor quantum dots.Among the kinds of promising systems,semiconductor quantum dot(QD)is considered as the most promising system for the realization of quantum computers due to its excellent controllability and scalability.And its ease of integration with traditonal electronic technology is also benefited for practical realization.In recent years,quantum processors based on quantum dots have been proposed that can perform certain quantum calculations.The realization of controllable coupling between any two qubits or even any number of qubits,is a key problem in the construction of programmable quantum processors.In this article,we demonstrate that these required coupling can be achieved in quantum dot circuits.In our proposed design,in which all double quantum dot molecules are connected to capacitors,various controllable coupling operations between qubits can be realized.Universal programmable quantum computing can be achieved by adjusting the bias on the gate electrode of the dual quantum dots in a such scheme.We also give the detailed control scheme of our designed system,and prove that the scheme is feasible under the existing technical conditions.In addition,this paper also summarizes the research progress of various quantum dot qubit systems at the present stage.