In a groundbreaking advance that could accelerate the development of quantum technologies, researchers at the USC Viterbi Ming Hsieh Department of Electrical and Computer Engineering and School of Advanced Computing have demonstrated the first optical filter capable of isolating and preserving quantum entanglement—a mysterious but powerful phenomenon at the heart of quantum computing, communication, and sensing. This work, published in Science, opens the door to compact, high-performance entanglement systems that can be integrated into quantum photonic circuits, enabling more reliable quantum computing architectures and communication networks.