Toward quantum interconnects featuring nanometer-to-picometer bandwidth compression and THz-range quantum frequency conversion

TL;DR

This paper discusses designs for quantum interconnects that enable efficient long-range quantum communication by bridging different photon regimes using frequency conversion and resonant confinement.

Contribution

It introduces a novel approach combining sum-frequency generation and resonant confinement in integrated ring resonators for quantum frequency conversion.

Findings

Proposes a design for quantum frequency conversion bridging nanometer and picometer photon regimes.

Highlights the potential for THz-range quantum frequency conversion.

Suggests integration of these components for improved quantum communication.

Abstract

The long-range transmission of quantum information relies on multiple interfaces between photons, acting as flying qubits, and localized memories, serving as repeaters, to mitigate transmission losses. Efficient, long-range transmission necessitates the use of short, picosecond-scale photons, which are markedly different from the narrowband, nanosecond-scale photons optimal for absorption by memory elements, typically operating at wavelengths far from telecom. In this article, we point toward designs capable of bridging these regimes, leveraging the interplay between sum-frequency generation-based quantum frequency conversion and resonant confinement in an integrated ring resonator.