Physics Proves Quantum Batteries Can't Be Both Powerful and Stable

A theorem in PRX Quantum shows that the more quantum entanglement boosts a battery's power, the more its output fluctuates, with no design workaround. The limit follows from the Heisenberg uncertainty principle. The paper appeared on September 15, 2026, and was named APS Featured in Physics.

• Theorem: more entanglement raises power fluctuations faster than average power
• The limit stems from non-commuting work and power operators
• Paper published in PRX Quantum 7, 033057 on September 15, 2026
• Authors span Finland, Germany, Spain and India