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Classical communication capacity of a channel can be enhanced either through a device called a 'quantum switch' or by putting the channel in a quantum superposition.
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G. Chiribella, G. M. DAriano, P. Perinotti, and B. Valiron, Quantum computations without definite causal structure, Physical Review A 88
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M. Araújo, C. Branciard, F. Costa, A. Feix, C. Giarmatzi, and Č. Brukner, Witnessing causal nonseparability, New Journal of Physics 17
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K. Wei, N. Tischler, S.-R. Zhao, Y.-H. Li, J. M. Arrazola, Y. Liu, W. Zhang, H. Li, L. You, Z. Wang, Y.-A. Chen, B. C. Sanders, Q. Zhang, G. J. Pryde, F. Xu, and J.-W. Pan, Experimental quantum switching for exponentially superior quantum communication complexity, Phys. Rev. Lett. 122
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2018
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2018
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G. Chiribella and H. Kristjánsson, Quantum Shannon theory with superpositions of trajectories, Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences 475
2019
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P. A. Guérin, G. Rubino, and C. Brukner, Communication through quantum-controlled noise, Phys. Rev. A 99
2019
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