Overview

• Researchers led by Federico Capasso and Kerolos M. A. Yousef experimentally validated metasurface quantum graphs by generating and manipulating entangled photons in a single ultrathin device.
• The team mapped theoretical photon connectivity graphs into nanoscale etched patterns that orchestrate multi-photon interference without traditional beam splitters or waveguides.
• Experimental trials showed low optical loss and resilience to misalignments and environmental fluctuations, addressing critical scalability barriers of bulk optical setups.
• Functioning at room temperature, the metasurface paves the way for integrated quantum computing, networking, and sensing components built with standard semiconductor fabrication.
• Published in Science and backed by the Air Force Office of Scientific Research with collaboration from Marko Lončar’s lab, the work represents a major step toward monolithic quantum photonic devices.