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- W2964810159 abstract "In quantum Shannon theory, transmission of information is enhanced by quantum features. Up to very recently, the trajectories of transmission remained fully classical. Recently, a new paradigm was proposed by playing quantum tricks on two completely depolarizing quantum channels i.e. using coherent control in space or time of the two quantum channels. We extend here this quantum control to the transmission of information through a network of an arbitrary number $N$ of channels with arbitrary individual capacity -- information preservation -- in the case of indefinite causal order. We propose a general procedure to assess information transmission in the most general case. We give and discuss the explicit information transmission for $N=2$, $N=3$ and in some special cases for an arbitrary $N$ as a function of all involved parameters. We also exhibit the detailed dependence of information transmission on the causal orders involved in the quantum control. We find, for example, in the case $N=3$ that the transmission of information for three channels is twice of transmission of the two channel case when a full superposition of all possible causal orders is used. For the case of $N$ channels, we find that the transmission of information depends on the parity of the number of channels $N$ and that certain causal orders yield a constant transmission of information, equal to the two-channel case. Finally, we suggest an optical implementation using standard telecom technology." @default.
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- W2964810159 date "2019-02-05" @default.
- W2964810159 modified "2023-09-27" @default.
- W2964810159 title "Communication through quantum coherent control of $N$ channels in a multi-partite causal-order scenario" @default.
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