One-way quantum computing in superconducting circuits

TL;DR

This paper proposes a practical method for implementing one-way quantum computing in superconducting circuits, leveraging existing technology to enable scalable quantum algorithms with over 20 qubits, advancing toward quantum supremacy.

Contribution

It introduces a feasible approach for one-way quantum computing in superconducting circuits, including a new initial state reducing resource requirements.

Findings

Initial cluster state can be generated with controlled-phase gates

Quantum algorithms with over 20 qubits are feasible with current technology

Proposed alternative initial state enhances resource efficiency

Abstract

We propose a method for the implementation of one-way quantum computing in superconducting circuits. Measurement-based quantum computing is a universal quantum computation paradigm in which an initial cluster-state provides the quantum resource, while the iteration of sequential measurements and local rotations encodes the quantum algorithm. Up to now, technical constraints have limited a scalable approach to this quantum computing alternative. The initial cluster state can be generated with available controlled-phase gates, while the quantum algorithm makes use of high-fidelity readout and coherent feedforward. With current technology, we estimate that quantum algorithms with above 20 qubits may be implemented in the path towards quantum supremacy. Moreover, we propose an alternative initial state with properties of maximal persistence and maximal connectedness, reducing the required resources of one-way quantum computing protocols.