Generation and characterization of resource state for nonlinear cubic phase gate

TL;DR

This paper reports the experimental creation and analysis of a resource state for implementing a nonlinear cubic phase gate, a crucial component for quantum computation, demonstrating properties consistent with cubic nonlinearity.

Contribution

It provides the first experimental realization and detailed characterization of a resource state for the cubic phase gate, advancing quantum information processing capabilities.

Findings

Resource state exhibits properties of cubic nonlinearity

Experimental validation of non-Gaussian state characteristics

Supports development of quantum computation with nonlinear gates

Abstract

Unitary non-Gaussian nonlinearity is one of the key components required for quantum computation and other developing applications of quantum information processing. Sufficient operation of this kind is still not available, but it can be approximatively implemented with help of a specifically engineered resource state constructed from individual photons. We present experimental realization and thorough analysis of such quantum resource state, and confirm that the state does indeed possess properties of a state produced by unitary dynamics driven by cubic nonlinearity.