Gil Kalai's argument Against Quantum Computers, Quantum strategies fail to improve capacity of quantum optical channels Researchers from IBM have proven that no quantum trick – no matter how complex or exotic – can improve the capacity of a type of quantum channel that serves as a building block of quantum optical communication systems. It comes as no big surprise, because the physical limits imposed by uncertainty principle to bandwidth of information transfer aren't very different from bottleneck of its processing. The quantum computers are potentially fast but very noisy and operate at low number of qbits. Whereas the classical computers are slower (at least in principle) - but their reliability and reproducibility is much higher. The same applies to the bandwidth of quantum links.
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