Resonator/zero-Qubit architecture for superconducting qubits

TL;DR

The paper evaluates the RezQu architecture for superconducting qubits, demonstrating its potential for high-fidelity quantum operations by reducing errors through strategic separation of information storage and processing components.

Contribution

It introduces an analysis of the RezQu architecture, highlighting its advantages in error reduction and fidelity improvement for superconducting qubits compared to previous designs.

Findings

Significant increase in ON/OFF ratio and reduction of idling error.

High fidelity performance achievable for medium-scale quantum processing.

Quantitative error estimates for key quantum operations.

Abstract

We analyze the performance of the Resonator/zero-Qubit (RezQu) architecture in which the qubits are complemented with memory resonators and coupled via a resonator bus. Separating the stored information from the rest of the processing circuit by at least two coupling steps and the zero qubit state results in a significant increase of the ON/OFF ratio and the reduction of the idling error. Assuming no decoherence, we calculate such idling error, as well as the errors for the MOVE operation and tunneling measurement, and show that the RezQu architecture can provide high fidelity performance required for medium-scale quantum information processing.