According to the ER $=$ EPR conjecture, entangled particles are connected by quantum wormholes. Under the assumption that some of the electric field surrounding an entangled charged particle leaks into the wormhole, we show that this effect will modify the hyperfine structure of the hydrogen atom. In addition, if the quantum wormholes are nontraversable, this will also lead to a nonzero total effective charge for the hydrogen atom. These effects provide strong constraints on the amplitude of this potential ER $=$ EPR effect, given high-precision measurements of the hydrogen atom’s hyperfine structure and total charge.

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• Quantum foundations
• Quantum gravity