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quant-ph2023★ 1 cited
Ehrenfest's theorem beyond the Ehrenfest time
Felipe Hernández, Daniel Ranard, C. Jess Riedel
In closed quantum systems, wavepackets can spread exponentially in time due to chaos, forming long-range superpositions in just seconds for ordinary macroscopic systems. A weakly c…
quant-ph2023
A spin-energy operator inequality for Heisenberg-coupled qubits
Daniel Ranard, C. Jess Riedel
We slightly strengthen an operator inequality identified by Correggi et al. that lower bounds the energy of a Heisenberg-coupled graph of spins using the total spin. In par…