1Department of Physics and Centre for Quantum Information Quantum Control University of Toronto, 60 St George St, Toronto, Ontario, M5S 1A7, Canada
2IonQ Canada Inc. 2300 Yonge St, Toronto ON, M4P 1E4
3Canadian Institute for Advanced Research, Toronto, Ontario, M5G 1M1, Canada
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Abstract
Information capacity enhancement through the coherent control of channels has attracted much attention of late, with work exploring the effect of coherent control of channel causal orders, channel superpositions, and information encoding. Coherently controlling channels necessitates a non-trivial expansion of the channel description, which for superposing qubit channels, is equivalent to expanding the channel to act on qutrits. Here we explore the nature of this capacity enhancement for the superposition of channels by comparing the maximum coherent information through depolarizing qubit channels and relevant superposed and qutrit channels. We show that the expanded qutrit channel description in itself is sufficient to explain the capacity enhancement without any use of superposition.
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Cited by
[1] Michael Antesberger, Marco Túlio Quintino, Philip Walther, and Lee A. Rozema, “Higher-order Process Matrix Tomography of a passively-stable Quantum SWITCH”, arXiv:2305.19386, (2023).
The above citations are from SAO/NASA ADS (last updated successfully 2023-10-04 12:15:07). The list may be incomplete as not all publishers provide suitable and complete citation data.
On Crossref’s cited-by service no data on citing works was found (last attempt 2023-10-04 12:15:06).
This Paper is published in Quantum under the Creative Commons Attribution 4.0 International (CC BY 4.0) license. Copyright remains with the original copyright holders such as the authors or their institutions.
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- Source: https://quantum-journal.org/papers/q-2023-10-03-1125/
