Hybrid quantum information processing

TL;DR

This paper reviews recent advances in hybrid quantum information processing, which combines discrete qubit-based protocols with high-dimensional Gaussian state methods, highlighting experimental progress and new hybrid protocols.

Contribution

It provides a comprehensive summary of recent experimental developments and hybrid protocols connecting discrete and continuous variable quantum information processing.

Findings

Significant experimental progress in hybrid quantum protocols

Development of new hybrid schemes integrating discrete and continuous variables

Enhanced interconnectivity between different quantum technologies

Abstract

The development of quantum information processing has traditionally followed two separate and not immediately connected lines of study. The main line has focused on the implementation of quantum bit (qubit) based protocols whereas the other line has been devoted to implementations based on high-dimensional Gaussian states (such as coherent and squeezed states). The separation has been driven by the experimental difficulty in interconnecting the standard technologies of the two lines. However, in recent years, there has been a significant experimental progress in refining and connecting the technologies of the two fields which has resulted in the development and experimental realization of numerous new hybrid protocols. In this Review, we summarize these recent efforts on hybridizing the two types of schemes based on discrete and continuous variables.