Title: Quantum-enhanced long baseline interferometry and ASPEN-Net (an All-Optical Phase-Stabile Quantum Network)
Abstract: Quantum networks offer a route to implement optical astronomical interferometry over long baselines, potentially enabling angular resolutions beyond those achievable with existing instruments. This presentation explores how distributed single-photon entanglement can provide a shared quantum reference for measuring the coherence of faint astronomical light, addressing sensitivity and transmission challenges in conventional interferometry. I will present laboratory demonstrations using simulated thermal sources and recent progress toward astronomical observations, including interference between sunlight and heralded single photons, while discussing the challenges that remain in demonstrating a quantum advantage. I then introduce ASPEN-Net—the Attosecond Synchronized Photonic Entanglement Network—an all-optical quantum networking project combining high-quality photon sources, photon-number-resolving detectors, optical memories, entanglement swapping, and attosecond-level phase stabilization. Designed to distribute entanglement at high rates and fidelity, ASPEN-Net aims to establish a platform for quantum-enhanced astronomy, distributed sensing, and secure communications.