Author
Kuniyil, Hashir Puthiyapurayil, Durak, Kadir
Publication Date
2021
Publication Place
-
SPIE
Subject
Entanglement fidelity, Quantum entanglement, Quantum information, Quantum key distribution, Spontaneous parametric down-conversion
Type
Document
Language
English
Digital
Yes
Manuscript
No
Library
Özyeğin University
Library Asset ID
978-151064526-4
Record ID
983dc58d-4ccf-4bbd-aeea-fe89658be8a2
Library Location
Electrical & Electronics Engineering
Date
2021
Notes
TÜBİTAK
Sample Text
Polarization entanglement based cryptography uses the photon pairs generated in a spontaneous parametric down-conversion process and guarantees the security through the violation of Bell's inequality. Certain experimental parameters affects the entanglement fidelity and leads to a possible information leakage. The optical path difference of photons born at different crystals contributes to reduced fidelity, due to the extra birefringence of the nonlinear crystal. Although previous studies suggested methods to erase the distinguishability of photons by introducing compensation crystals, the phase difference, which is due to the lateral ray distribution is not studied. We used two commercially available collection optics; an aspheric and an achromatic lens. With these collection optics, the effect of collection optics on the entanglement fidelity is studied. We developed a simulation of such a system and found that aspheric collection optics is more suitable to achieve high fidelity.
DOI
10.1117/12.2600933
Cilt
11844
