On-chip frequency-bin quantum photonics

TL;DR

This paper reviews recent advances in on-chip frequency-bin quantum photonics, emphasizing progress in sources, state manipulation, and hyperentanglement, and discusses its potential for scalable quantum information processing and communication.

Contribution

It highlights recent developments at the intersection of frequency-bin encoding and integrated photonics, emphasizing progress towards scalable on-chip quantum photonic systems.

Findings

Advances in integrated sources for frequency-bin encoding

Progress in on-chip state manipulation techniques

Demonstrations of hyperentanglement in frequency-bin systems

Abstract

Frequency-bin encoding furnishes a compelling pathway for quantum information processing systems compatible with established lightwave infrastructures based on fiber-optic transmission and wavelength-division multiplexing. Yet although significant progress has been realized in proof-of-principle tabletop demonstrations, ranging from arbitrary single-qubit gates to controllable multiphoton interference, challenges in scaling frequency-bin processors to larger systems remain. In this Perspective, we highlight recent advances at the intersection of frequency-bin encoding and integrated photonics that are fundamentally transforming the outlook for scalable frequency-based quantum information. Focusing specifically on results on sources, state manipulation, and hyperentanglement, we envision a possible future in which on-chip frequency-bin circuits fulfill critical roles in quantum information processing, particularly in communications and networking.