Quantum cryptography is now out of the lab. Simple networks connecting quantum encryption nodes have been created or proposed. However, there are a number of problems with scalability and basic capabilities that need to be addressed for quantum encryption nodes. Techniques presented herein provide mechanisms through which more efficient use can be made of both the port and the fiber for a quantum encryption node by optically multiplexing quantumly encrypted streams of photons with other such streams or streams of regular data.
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Bradford, Rich, "INTERFACE MULTIPLEXING TO SUPPORT QUANTUM CRYPTOGRAPHY", Technical Disclosure Commons, (November 16, 2021)