Highly Efficient Processing Multi-photon States

TL;DR

This paper introduces a resource-efficient method for implementing multi-qubit gates on single photons using cross phase modulation, potentially enabling scalable quantum information processing.

Contribution

The paper presents a novel approach to realize multi-qubit gates with reduced resource requirements based on cross phase modulation.

Findings

Deterministic multi-qubit gates on single photons achieved

Significant resource reduction compared to existing methods

Potential for facilitating large-scale quantum computing

Abstract

How to implement multi-qubit gates is an important problem in quantum information processing. Based on cross phase modulation, we present an approach to realizing a family of multi-qubit gates that deterministically operate on single photons as the qubits. A general $n$-qubit unitary operation is a typical example of these gates. The approach greatly relax the requirement on the resources, such as the ancilla photons and coherent beams, as well as the number of operations on the qubits. The improvement in this framework may facilitate large scale quantum information processing.