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QI: Fachverband Quanteninformation
QI 36: Poster – Quantum Information (joint session QI/Q)
QI 36.18: Poster
Donnerstag, 13. März 2025, 17:00–19:00, Tent
Generation and characterization of entangled photon source through the spontaneous parametric down conversion — •Chandana Rao Attigadde Shashikirana1,2,3, Umakant D Rapol1, and Anindita Bannerjee2 — 1Indian Institute of Science Education and Research, Pune, India — 2Centre for Development of Advanced Computing (CDAC), Pune, India — 3Department of Computer Science, Paderborn University, Warburger str.100, 33098, Paderborn, Germany
The work is on the generation and characterization of an entangled photon source using a type-1 crossed Beta-Barium Borate (BBO) crystal through spontaneous parametric down-conversion (SPDC), with a focus on understanding the quantum entanglement phenomenon.
Various experimental tests, including the Hanbury Brown and Twiss (HBT) experiment, visibility measurements, the Clauser Horne-Shimony-Holt (CHSH) inequality, and polarization correlation measurements, were conducted to characterize the entangled photon source. Additionally, the quantum state tomography technique was used to reconstruct the density matrix of the entangled photons.
The results show that the source generates entangled, single photons, which violate the Bell inequality as evidenced by the CHSH parameter of 2.629. The concurrence value of 0.708 and linear entropy of 0.244 provide estimates of the degree of entanglement and the noise present in the entangled photons, respectively.
Keywords: Entanglement; Down-conversion; SPDC process; concurrence; CHSH inequality