Abstract: A system and a method for controlling a qubit in a decentralized and distributed manner to obtain a scalable structure of a hybrid quantum-classical architecture is disclosed. The system includes a circuit configured to provide an operation frequency control of qubits in an island representation of a logical qubit island with a plurality of physical qubits along with independent magnetic-field control to each qubit on a hardware substrate. The circuit includes a plurality of micro/nano-scale current-carrying structures in the vicinity of a qubit for controlling and manipulating the qubit using the locally generated variable magnetic field, in turn controlled by a tunable current flowing through the plurality of micro/nano-scale current-carrying structures. The plurality of micro/nano-scale current-carrying structures in conjunction with a fast current control are configured to provide fast switching/tuning of magnetic fields enabling rapid adiabatic passage control of one or more qubits simultaneously.

Abstract: The embodiments herein provide a method and a system for generating and regulating local magnetic field variations required for spin qubit manipulation based on scalable quantum processors using micro-structures in integrated circuits. In an embodiment the system provides an adaptive and independent magnetic-field control to each qubit on a hardware substrate and comprises several micro/nano-scale current-carrying structures near a qubit for controlling and manipulating the qubit using the locally generated variable magnetic field, in-turn controlled by the tunable current flowing through these structures. The current-carrying structures in conjunction with fast current control provides fast switching/tuning of magnetic fields for rapid adiabatic passage control of one or more qubits simultaneously.