Zero energy for quantum information processing

What is it about?

The speed of quantum information processing is limited by energy of the system implementing the processing. The speed of formation of entanglement in a bipartite quantum system is derived emphasizing relative advantage of the average zero (interaction) energy in the system. This is in sharp contrast with the known bounds for the orthogonal state transitions.

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Why is it important?

The standard wisdom says: more energy (on average) provides faster information processing. Regarding the formation of entanglement in bipartite systems, this is not the case. A new bound for such kind of non-orthogonal state transitions is established leading to counterintuitive picture: the zero mean energy can provide faster state transition and therefore faster quantum information processing.