Superconducting qubits can be coupled and addressed as trapped ions

TL;DR

This paper proposes a scalable superconducting qubit system that mimics trapped ion setups, using Josephson junctions coupled via a superconducting LC circuit for controlled interactions and information transfer.

Contribution

It introduces a novel superconducting qubit architecture that leverages LC circuits for scalable, controllable qubit interactions similar to trapped ion systems.

Findings

Scalable superconducting qubit circuit design proposed.

Controlled qubit operations via frequency-tuned magnetic fluxes.

Qubit interactions mediated by LC circuits are selectively controllable.

Abstract

Exploiting the intrinsic nonlinearity of superconducting Josephson junctions, we propose a scalable circuit with superconducting qubits (SCQs) which is very similar to the successful one now being used for trapped ions. The SCQs are coupled to the "vibrational" mode provided by a superconducting LC circuit or its equivalent (e.g., a SQUID). Both single-qubit rotations and qubit-LC-circuit couplings/decouplings can be controlled by the frequencies of the time-dependent magnetic fluxes. The circuit is scalable since the qubit-qubit interactions, mediated by the LC circuit, can be selectively performed, and the information transfer can be realized in a controllable way.