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• W3100132718 startingPage "333" @default.
• W3100132718 abstract "A completely depolarising quantum channel always outputs a fully mixed state and thus cannot transmit any information. In a recent Lettercite{ebler18}, it was however shown that if a quantum state passes through two such channels in a quantum superposition of different orders---a setup known as the ``quantum switch''---then information can nevertheless be transmitted through the channels. Here, we show that a similar effect can be obtained when one coherently controls between sending a target system through one of two identical depolarising channels. Whereas it is tempting to attribute this effect in the quantum switch to the indefinite causal order between the channels, causal indefiniteness plays no role in this new scenario. This raises questions about its role in the corresponding effect in the quantum switch. We study this new scenario in detail and we see that, when quantum channels are controlled coherently, information about their specific implementation is accessible in the output state of the joint control-target system. This allows two different implementations of what is usually considered to be the same channel to therefore be differentiated. More generally, we find that to completely describe the action of a coherently controlled quantum channel, one needs to specify not only a description of the channel (e.g., in terms of Kraus operators), but an additional ``transformation matrix'' depending on its implementation." @default.
• W3100132718 created "2020-11-23" @default.
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• W3100132718 date "2020-09-24" @default.
• W3100132718 modified "2023-10-10" @default.
• W3100132718 title "Communication through coherent control of quantum channels" @default.
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• W3100132718 doi "https://doi.org/10.22331/q-2020-09-24-333" @default.
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