Characterizing Bell state analyzer using weak coherent pulses

Donghwa Lee, Young Wook Cho, Hyang Tag Lim, Sang Wook Han, Hojoong Jung, Sung Moon, Yong Su Kim

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)


Bell state analyzer (BSA) is one of the most crucial apparatuses in photonic quantum information processing. While linear optics provide a practical way to implement BSA, it provides unavoidable errors when inputs are not ideal single-photon states. Here, we propose a simple method to deduce the BSA for single-photon inputs using weak coherent pulses. By applying the method to Reference-Frame-Independent Measurement-Device-Independent Quantum Key Distribution, we experimentally verify the feasibility and effectiveness of the method.

Original languageEnglish
Article number149
JournalQuantum Information Processing
Issue number4
Publication statusPublished - 2021 Apr

Bibliographical note

Funding Information:
This work was supported by the NRF programs (2019M3E4A1079777, 2019R1A2C2006381, 2019M3E4A107866011), the IITP programs (2020-0-00947, 2020-0-00972), and the KIST research program (2E30620).

Publisher Copyright:
© 2021, The Author(s), under exclusive licence to Springer Science+Business Media, LLC, part of Springer Nature.

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Statistical and Nonlinear Physics
  • Theoretical Computer Science
  • Signal Processing
  • Modelling and Simulation
  • Electrical and Electronic Engineering


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