Episode 49 of The Quantum Computing Podcast explores how quantum key distribution (QKD) is being tested to protect the aging U.S. power grid from cyberattacks. Lucas and Luna discuss a pilot program by the Department of Energy and a major utility company, using entangled photons to secure communications between substations. They break down how QKD differs from classical encryption, why grid operators are worried about 'harvest now, decrypt later' attacks, and what it means for energy infrastructure in 2026. Specific focus on the Tennessee Valley Authority's testbed in Chattanooga, which began transmitting encrypted grid-control signals over a quantum-secured fiber link in April 2026. The hosts also examine challenges like distance limits and the need for quantum repeaters, and whether this is a near-term fix or a long-term bet.

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