Scalable quantum computation architecture using always-on Ising interactions via quantum feedforward

TL;DR

The paper introduces a scalable quantum computing architecture that leverages always-on Ising interactions and quantum feedforward to control qubit interactions, enabling efficient generation of cluster states for fault-tolerant quantum computation.

Contribution

It presents a novel method to control qubit interactions using projective measurements and feedforward, avoiding the need to modulate interaction strength directly.

Findings

Effective control of qubit interactions via measurement and feedforward.

Generation of 2D and 3D cluster states for universal quantum computation.

Provides an alternative scalable approach to quantum architecture.

Abstract

Here, we propose a way to control the interaction between qubits with always-on Ising interaction. Unlike the standard method to change the interaction strength with unitary operations, we fully make use of non-unitary properties of projective measurements so that we can effectively turn the interaction on or off via feedforward. Our scheme is useful to generate two- or three-dimensional cluster states that are universal resources for fault-tolerant quantum computation with this scheme, and it provides an alternative way to realize a scalable quantum pro