Page 498 - Kaleidoscope Academic Conference Proceedings 2024

S1.3 Hong-Ou-Mandel Dip Measurement of Two Independent Weak Coherent Pulses*
Vivek Kumar (Centre for Development of Telematics, India); Prasanta Halder (C-DOT, India);
Arka Mukherjee, Luv Goyal, V S Vaishnavi Adurti, Roshan Lal Sharma, Prashant Kumar
Rathore, Atul Gupta and Priya Malpani (Centre for Development of Telematics, India); Pankaj
Kumar Dalela (C-DOT, India); Rajkumar Upadhyay (Centre for Development of Telematics,
India)

Due to the simplicity of Hong-Ou-Mandel (HOM) interferometer setup, it becomes very
important in various quantum-based applications, especially when the photon
indistinguishability is required such as measurement device independent quantum key
distribution (MDI-QKD). In the present work, the HOM experiment setup is designed to study
the quantum interference between two indistinguishable photons (frequency, time of arrival and
polarization should be same for both photons) coming from two independent laser sources
(attenuated laser). The aim is to achieve high visibility as it indicates the photon
indistinguishability from two independent sources. Theoretically, the visibility is 50% for
indistinguishable photons from attenuated laser sources but in the experiment, due to various
devices imperfections and other factors it is less than 50%. The HOM visibility achieved from
our setup is 40% tested for a distance of 20 km over standard single mode fiber (SMF).

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