Quantum repeaters based on concatenated bosonic and discrete-variable quantum codes

Rozpędek, Filip; Noh, Kyungjoo; Xu, Qian; Guha, Saikat; Jiang, Liang

doi:10.1038/s41534-021-00438-7

Quantum repeaters based on concatenated bosonic and discrete-variable quantum codes

Journal Article · 22 June 2021 · npj Quantum Information

DOI:https://doi.org/10.1038/s41534-021-00438-7· OSTI ID:1853211

; ; Xu, Qian; Guha, Saikat;

Abstract We propose an architecture of quantum-error-correction-based quantum repeaters that combines techniques used in discrete- and continuous-variable quantum information. Specifically, we propose to encode the transmitted qubits in a concatenated code consisting of two levels. On the first level we use a continuous-variable GKP code encoding the qubit in a single bosonic mode. On the second level we use a small discrete-variable code. Such an architecture has two important features. Firstly, errors on each of the two levels are corrected in repeaters of two different types. This enables for achieving performance needed in practical scenarios with a reduced cost with respect to an architecture for which all repeaters are the same. Secondly, the use of continuous-variable GKP code on the lower level generates additional analog information which enhances the error-correcting capabilities of the second-level code such that long-distance communication becomes possible with encodings consisting of only four or seven optical modes.

Research Organization:: Yale Univ., New Haven, CT (United States)

Sponsoring Organization:: USDOE Office of Science (SC)

DOE Contract Number:: SC0019406

OSTI ID:: 1853211

Journal Information:: npj Quantum Information, Vol. 7, Issue 1; ISSN 2056-6387

Publisher:: Nature Partner Journals

Country of Publication:: United States

Language:: English

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