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Channel capacity enhancement with indefinite causal order

Nicolas Loizeau 1 Alexei Grinbaum 2
2 LRSM - Laboratoire des Recherches sur les Sciences de la Matière
IRFU - Institut de Recherches sur les lois Fondamentales de l'Univers : DRF/IRFU
Abstract : 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. The gains in the two cases, although different, have their origin in the use of a quantum resource, but is it the same resource? Here this question is explored through simulating large sets of random channels. We find that quantum superposition always provides an advantage, while the quantum switch does not: it can either increase or decrease communication capacity. The origin of this discrepancy can be attributed to a subtle combination of superposition and non-commutativity.
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Contributor : Alexei Grinbaum <>
Submitted on : Wednesday, March 10, 2021 - 5:26:50 PM
Last modification on : Thursday, March 11, 2021 - 3:38:26 AM

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Nicolas Loizeau, Alexei Grinbaum. Channel capacity enhancement with indefinite causal order. Physical Review A, American Physical Society 2020, 101, pp.012340. ⟨10.1103/PhysRevA.101.012340⟩. ⟨cea-02284796⟩

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