Quantum mechanics is compatible with scenarios where the relative order between two events can be indefinite.Here we show that two independent instances of a noisy process can behave as a perfect quantum communication channel when used in a coherent superposition of two alternative orders.This phenomenon occurs even if the original process has zero
Optical vortices (OVs), as eigenmodes of optical orbital angular momentum, have been widely used in particle micro-manipulation.Recently, static nail coupon perfect optical vortices (POVs), a subclass of OVs, are gaining increasing interest and becoming an indispensable tool in optical trapping due to their unique property of topological charge-ind
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