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quant-ph2026
Tight bounds on recurrence time in closed quantum systems
Marcin Kotowski, MichaÅ Oszmaniec
The evolution of an isolated quantum system inevitably exhibits recurrence: the state returns to the vicinity of its initial condition after finite time. Despite its fundamental na…
quant-ph2026
Randomized simulation of quantum channels using small ancilla
Marcin Kotowski, MichaÅ Kotowski
We study the problem of implementing a quantum channel using a small ancilla with classical randomization and postselection on an output failure flag. The simulation is probabilist…