Entanglement verification with detection-efficiency mismatch

Yanbao Zhang; Norbert Lütkenhaus

doi:10.1103/PhysRevA.95.042319

Entanglement verification with detection-efficiency mismatch

Yanbao Zhang, Norbert Lütkenhaus

Research output: Contribution to journal › Article › peer-review

7 Scopus citations

Abstract

The security analysis of quantum key distribution is difficult to perform when there is efficiency mismatch between various threshold detectors involved in an experimental setup. Even the verification that the device actually performs in the quantum domain, referred to as the task of entanglement verification, is hard to perform. In this article we provide such an entanglement-verification method for characterized detection-efficiency mismatch. Our method does not rely on a cutoff of photon numbers in the optical signal. It can be applied independently of the degrees of freedom involved, thus covering, for example, efficiency mismatch in polarization and time-bin modes, but also in spatial modes. The evaluation of typical experimental scenarios suggests that an increase of detection-efficiency mismatch will drive the performance of a given setup out of the quantum domain.

Original language	English
Article number	042319
Journal	Physical Review A
Volume	95
Issue number	4
DOIs	https://doi.org/10.1103/PhysRevA.95.042319
State	Published - Apr 14 2017
Externally published	Yes

Funding

We gratefully acknowledge supports through the U.S. Office of Naval Research (ONR), the Ontario Research Fund (ORF), the Natural Sciences and Engineering Research Council of Canada (NSERC), and Industry Canada.

Funders	Funder number
Office of Naval Research
Ontario Research Foundation
Natural Sciences and Engineering Research Council of Canada
Industry Canada

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10.1103/PhysRevA.95.042319

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Entanglement verification with detection-efficiency mismatch

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