Theory of high-efficiency sum-frequency generation for single-photon waveform conversion

TL;DR

This paper develops a theoretical framework for high-efficiency, high-fidelity single-photon waveform conversion using sum-frequency generation, enabling better quantum system integration and information distribution.

Contribution

It introduces a non-perturbative model for optimizing single-photon waveform conversion via sum-frequency generation, including effects on entanglement and aberrations.

Findings

High-efficiency and high-fidelity conversion regimes identified

Aberrations due to time ordering are negligible under certain conditions

Quantum optical waveform conversion and time lensing are feasible with these techniques

Abstract

The optimal properties for single photons may vary drastically between different quantum technologies. Along with central frequency conversion, control over photonic temporal waveforms will be paramount to the effective coupling of different quantum systems and efficient distribution of quantum information. Through the application of pulse shaping and the nonlinear optical process of sum-frequency generation, we examine a framework for manipulation of single-photon waveforms. We use a non-perturbative treatment to determine the parameter regime in which both high-efficiency and high-fidelity conversion may be achieved for Gaussian waveforms and study the effect such conversion techniques have on energy-time entanglement. Additionally, we prove that aberrations due to time ordering are negligible when the phasematching is nonrestrictive over the input bandwidths. Our calculations show that ideal quantum optical waveform conversion and quantum time lensing may be fully realized using these techniques.