Abstract
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 language | English |
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Article number | 342 |
Number of pages | 11 |
Journal | Quantum Information Processing |
Volume | 18 |
Issue number | 11 |
DOIs | |
Publication status | Published - 2019 |
Keywords
- Quantum communication
- Quantum process tomography
- Two-photon interference