Coherent operation of superconducting flux qubits

TL;DR

This paper investigates the quantum operation of coupled superconducting flux qubits under microwave irradiation, demonstrating high-performance controlled-NOT gate implementation facilitated by strong coupling.

Contribution

It introduces a Hamiltonian model for coupled flux qubits under microwave fields and analyzes their operation, highlighting the potential for high-fidelity quantum gates.

Findings

Strong coupling enables high-performance CNOT gates

Microwave fields influence switching functions of phase-coupled qubits

Flux qubits modeled as magnetic dipoles under weak microwave fields

Abstract

We study the quantum operation of coupled superconducting flux qubits under a microwave irradiation. The flux qubits can be described as magnetic dipole moments in the limit of weak microwave field amplitude consistent with usual experimental situations. With the Hamiltonian for coupled qubits under a microwave field, we show that a strong coupling enables to realize the high performance controlled-NOT gate operation. For practical quantum computing we analyze the effect of microwave on switching function of phase-coupled qubits.