Characterization of depolarizing channels using two-photon interference

G. C. Amaral*, G. P. Temporão

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

6 Citations (Scopus)
87 Downloads (Pure)


Depolarization is one of the most important sources of error in a quantum communication link that can be introduced by the quantum channel. Even though standard quantum process tomography can, in theory, be applied to characterize this effect, in most real-world implementations depolarization cannot be distinguished from time-varying unitary transformations, especially when the timescales are much shorter than the detectors response time. In this paper, we introduce a method for distinguishing true depolarization from fast polarization rotations by employing Hong–Ou–Mandel interference. It is shown that the results are independent of the timing resolutions of the photodetectors.

Original languageEnglish
Article number342
Number of pages11
JournalQuantum Information Processing
Issue number11
Publication statusPublished - 2019


  • Quantum communication
  • Quantum process tomography
  • Two-photon interference


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