Experimental measurement-based quantum computing beyond the cluster-state model

TL;DR

This paper demonstrates the experimental realization of measurement-based quantum computation using non-cluster entangled states, showing the feasibility of a new approach to quantum computing beyond traditional cluster states.

Contribution

It provides the first experimental implementation of measurement-based quantum computation using states outside the cluster-state model, specifically in the correlation space framework.

Findings

Successfully implemented universal single-qubit rotations.

Realized two-qubit entangling gates.

Executed Deutsch's algorithm with non-cluster states.

Abstract

The paradigm of measurement-based quantum computation opens new experimental avenues to realize a quantum computer and deepens our understanding of quantum physics. Measurement-based quantum computation starts from a highly entangled universal resource state. For years, clusters states have been the only known universal resources. Surprisingly, a novel framework namely quantum computation in correlation space has opened new routes to implement measurement-based quantum computation based on quantum states possessing entanglement properties different from cluster states. Here we report an experimental demonstration of every building block of such a model. With a four-qubit and a six-qubit state as distinct from cluster states, we have realized a universal set of single-qubit rotations, two-qubit entangling gates and further Deutsch's algorithm. Besides being of fundamental interest, our experiment proves in-principle the feasibility of universal measurement-based quantum computation without using cluster states, which represents a new approach towards the realization of a quantum computer.