Ising interaction between capacitively-coupled superconducting flux qubits

TL;DR

This paper proposes a novel capacitive coupling scheme to generate controllable Ising interactions between superconducting flux qubits, enabling easier individual addressability and advancing superconducting quantum computing.

Contribution

It introduces a new capacitive coupling method for flux qubits, offering voltage-controlled interaction strength as an alternative to magnetic field control.

Findings

Capacitive coupling enables voltage-controlled Ising interactions.

The scheme improves individual qubit addressability.

It advances the development of superconducting flux qubit quantum computers.

Abstract

Here, we propose a scheme to generate a controllable Ising interaction between superconducting flux qubits. Existing schemes rely on inducting couplings to realize Ising interactions between flux qubits, and the interaction strength is controlled by an applied magnetic field On the other hand, we have found a way to generate an interaction between the flux qubits via capacitive couplings. This has an advantage in individual addressability, because we can control the interaction strength by changing an applied voltage that can be easily localized. This is a crucial step toward the realizing superconducting flux qubit quantum computation.