High-dimensional frequency-bin entangled photons in an optical microresonator on a chip

TL;DR

This paper demonstrates on-chip generation and verification of high-dimensional frequency-bin entanglement in photons from an integrated microresonator, advancing scalable quantum information processing and secure communication.

Contribution

It provides the first verification of qubit and qutrit frequency-bin entanglement using an integrated microresonator with 40 mode pairs, employing electro-optic phase modulation.

Findings

Verified qubit and qutrit frequency-bin entanglement on-chip

Used 40 mode pairs for high-dimensional entanglement

Demonstrated potential for scalable quantum computing and secure QKD

Abstract

Quantum frequency combs from chip-scale integrated sources are promising candidates for scalable and robust quantum information processing (QIP). However, to use these quantum combs for frequency domain QIP, demonstration of entanglement in the frequency basis, showing that the entangled photons are in a coherent superposition of multiple frequency bins, is required. We present a verification of qubit and qutrit frequency-bin entanglement using an on-chip quantum frequency comb with 40 mode pairs, through a two-photon interference measurement that is based on electro-optic phase modulation. Our demonstrations provide an important contribution in establishing integrated optical microresonators as a source for high-dimensional frequency-bin encoded quantum computing, as well as dense quantum key distribution.