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We derive a universal lower bound of actuating energy $E_{s}$ for broadbandphoton switching by using an uncertainty relation between time and the negativeenergy density of quantum fields. We find that broadband photon switchingbetween perfect reflection and perfect transmission over a time $t_s$ shouldsatisfy $E_{s}\geq\frac{\hbar}{6\pi t_s}$.

A Fundamental Lower Bound of Actuating Energy for Broadband Photon Switching