Ultra-bright multiplexed energy-time entangled photon generation from lithium niobate on insulator chip

TL;DR

This paper reports a lithium niobate on insulator chip that generates ultra-bright, multiplexed energy-time entangled photons with significantly higher flux and spectral brightness than previous technologies, enabling advanced quantum information applications.

Contribution

It introduces a high-flux, broadband energy-time entangled photon source on a chip with over two orders of magnitude improvement in brightness and multiplexed capabilities.

Findings

Photon pair rate of 2.79×10^11 Hz/mW achieved

Spectral brightness of 1.53×10^9 Hz/nm/mW demonstrated

High-visibility Franson interference up to 99.17% observed

Abstract

High-flux entangled photon source is the key resource for quantum optical study and application. Here it is realized in a lithium niobate on isolator (LNOI) chip, with 2.79*10^11 Hz/mW photon pair rate and 1.53*10^9 Hz/nm/mW spectral brightness. These data are boosted by over two orders of magnitude compared to existing technologies. A 130-nm broad bandwidth is engineered for 8-channel multiplexed energy-time entanglement. Harnessed by high-extinction frequency correlation and Franson interferences up to 99.17% visibility, such energy-time entanglement multiplexing further enhances high-flux data rate, and warrants broad applications in quantum information processing on a chip.