Weakly Flux-Tunable Superconducting Qubit

Abstract

Superconducting qubits are building blocks for quantum processors, but they suffer from frequency collisions, which hinder the construction of large qubit lattices. This study introduces weakly tunable qubits, whose frequency can be tuned over a small range via external magnetic flux. Through theoretical derivation and experimental demonstration, the authors show that these transmonlike qubits---without losing the desired key properties---can be used to avoid frequency collisions in large qubit systems while minimizing the sensitivity to flux noise. They can also be applied to operate flux-tuned qubit gates.

Topics & Concepts