Zero-added-loss entanglement multiplexing using time-bin spectral shearing

TL;DR

This paper introduces a ZALM source design using time-bin entanglement and spectral shearing, optimizing spectral multiplexing for high-quality quantum communication and verifying experimental compatibility.

Contribution

It proposes a novel ZALM source design with time-bin entanglement and spectral shearing, and experimentally verifies their compatibility for quantum communication.

Findings

Spectral shearing can be applied without phase shifts to time-bin pulses.

The ZALM source design enhances spectral multiplexing capabilities.

Experimental verification shows compatibility of time-bin pulses with spectral shearing.

Abstract

High-quality quantum communications that enable important capabilities, such as distributed quantum computing and sensing, will require quantum repeaters for providing high-quality entanglement. To realize high-rate heralded entanglement for quantum repeaters, Chen et al. [Phys. Rev. Appl. 19, 054209 (2023)] proposed a scheme for heralded-multiplexed generation of quasi-deterministic entangled photon pairs, called zero-added-loss multiplexing (ZALM). Here, we propose a design of ZALM source using time-bin entanglement and spectral shearing. Additionally, we provide an analysis of experimentally relevant spectral-shearing parameters to optimize the spectral multiplexing. Moreover, we experimentally verify the compatibility of time-bin pulses and spectral shearing, as supported by observation of no appreciable phase shift when the same shearing is applied to both time bins. These results expand the benefits of applying a ZALM source to time-bin entanglement use cases. Moreover, more fully demonstrating time-bin and spectral shearing compatibility clears a path towards a broader use of spectral shearing that provides a deterministic frequency shift of high utility.