Quantum Battery Designers Cannot Have Both High Power and Stable Output, Physics Proves

Six months after Australian scientists demonstrated the world's first working quantum battery prototype, a new theorem published in PRX Quantum establishes that the field's most celebrated engineering advantage — using quantum entanglement to supercharge battery power — comes with a mathematically inescapable cost: the more entanglement a design exploits, the more its power output fluctuates, with no design workaround possible. The theorem is not a study of specific materials or experimental conditions. It is a proof, derived from the same Heisenberg uncertainty principle that governs the position and momentum of subatomic particles, that every quantum battery ever built or ever to be built faces an irreducible reliability trade-off between how stably it delivers energy and how stably it delivers power. The paper's core finding was confirmed in the peer-reviewed PRX Quantum publication. The paper, "Fundamental Limitations on the Reliabilities of Power and Work in Quantum Batteries," appeared in PRX Quantum 7, 033057 on September 15, 2026, and was selected by the American Physical Society as "Featured in Physics" — a designation reserved for research the APS editors consider significant beyond its immediate field. The four-author team spans Finland, Germany, Spain, and India: Brij Mohan at the University of Oulu's Nano…