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A Margolus-Levitin speed limit for observables: mean energy bounds expectation-value change quadratically
The Mandelstam-Tamm and Margolus-Levitin quantum speed limits bound how fast a state evolves, using the energy variance and the mean energy above the ground state. Speed limits on observables -- the change of an expectation value -- have so far used the variance (the Mandelstam-Tamm / quantum
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