Work

Causal order as a resource for quantum communication

Year: 2019

Type: article

Abstract: In theories of communication, it is usually presumed that the involved parties perform actions in a fixed causal order. However, practical and fundamental reasons can induce uncertainties in the causal order. Here we show that a maximal uncertainty in the causal order forbids asymptotic quantum communication, while still enabling the noisy transfer of classical information. Therefore causal order, like shared entanglement, is an additional resource for communication. The result is formulated within an asymptotic setting for processes with no fixed causal order, which sets a basis for a quantum information theory in general quantum causal structures.

Source: Physical Review A

DOI: 10.1103/physreva.100.052319

Authors: Ding Jia, Fabio Costa

Institutions: University of Waterloo, Perimeter Institute, The University of Queensland

Language: English

Topic: Quantum Information and Cryptography

Subfield: Artificial Intelligence

Field: Computer Science

Domain: Physical Sciences

Open Access status: green

Funders: John Templeton Foundation, Innovation, Science and Economic Development Canada, Centre of Excellence for Electromaterials Science, Australian Research Council

Award: G4652853994