Routing entanglement in the quantum internet
Author(s)Pant, Mihir; Englund, Dirk R.
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Remote quantum entanglement can enable numerous applications including distributed quantum computation, secure communication, and precision sensing. We consider how a quantum network—nodes equipped with limited quantum processing capabilities connected via lossy optical links—can distribute high-rate entanglement simultaneously between multiple pairs of users. We develop protocols for such quantum “repeater” nodes, which enable a pair of users to achieve large gains in entanglement rates over using a linear chain of quantum repeaters, by exploiting the diversity of multiple paths in the network. Additionally, we develop repeater protocols that enable multiple user pairs to generate entanglement simultaneously at rates that can far exceed what is possible with repeaters time sharing among assisting individual entanglement flows. Our results suggest that the early-stage development of quantum memories with short coherence times and implementations of probabilistic Bell-state measurements can have a much more profound impact on quantum networks than may be apparent from analyzing linear repeater chains. This framework should spur the development of a general quantum network theory, bringing together quantum memory physics, quantum information theory, quantum error correction, and computer network theory.
DepartmentMassachusetts Institute of Technology. Department of Electrical Engineering and Computer Science
npj Quantum Information
Springer Science and Business Media LLC
Pant, Mihir et al. “Routing entanglement in the quantum internet.” npj Quantum Information, 5, 1 (April 2019): 25 © 2019 The Author(s)
Final published version