Synchronization of Multiple Coupled rf-SQUID Flux Qubits

TL;DR

This paper demonstrates a practical method to synchronize multiple rf-SQUID flux qubits on a chip by applying custom flux offsets, compensating for fabrication variations to enable coherent quantum operations.

Contribution

The study introduces a novel flux offset tuning strategy to synchronize multiple rf-SQUID flux qubits, improving their uniformity for quantum computing applications.

Findings

Synchronization of qubit persistent current achieved

Tunnel splitting can be simultaneously synchronized

Effective compensation for fabrication variations

Abstract

A practical strategy for synchronizing the properties of compound Josephson junction rf-SQUID qubits on a multiqubit chip has been demonstrated. The impacts of small ($\sim1%$) fabrication variations in qubit inductance and critical current can be minimized by the application of a custom tuned flux offset to the CJJ structure of each qubit. This strategy allows for simultaneous synchronization of the qubit persistent current and tunnel splitting over a range of external bias parameters that is relevant for the implementation of an adiabatic quantum processor.