Fiche du document
24 janvier 2020
- handle: 10670/1.lnqavx
- cea-02284796
- ARXIV: 1906.08505
- doi: 10.1103/PhysRevA.101.012340
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info:eu-repo/semantics/altIdentifier/arxiv/1906.08505
Ce document est lié à :
info:eu-repo/semantics/altIdentifier/doi/10.1103/PhysRevA.101.012340
info:eu-repo/semantics/OpenAccess
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Communication, Primitive Mass communicationCiter ce document
Nicolas Loizeau et al., « Channel capacity enhancement with indefinite causal order », HAL-SHS : philosophie, ID : 10.1103/PhysRevA.101.012340
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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. 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.