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2024 ITU Kaleidoscope Academic Conference
Figure 4 – The dashed block in the figure represents the setup to achieve polarization overlap between two independent
photons.
measured coincidence counts exhibit an interference effect
with visibility of 40% tested for a distance of 20 km over
standard SMF.
Figure 6 – Bob laser pulse.
Figure 5 – Alice laser pulse.
Figure 7 – SPAD1 and SPAD2 counts.
4. CONCLUSION AND FUTURE SCOPE on improving the visibility to approach the theoretical limit
of 50%, utilizing SNSPDs over longer distances to enhance
In this work, we have demonstrated the HOM experiment practical applicability.
using two attenuated laser sources and analyzed the resulting
coincidence counts. The achieved visibility indicates
REFERENCES
potential use in QKD protocols, such as MDI-QKD, for secure
key generation. Superconducting nanowire single photon
detectors (SNSPDs) offer significantly lower dark count rates [1] N. Gisin and, R. Thew, “Quantum communication” Nat.
and near-zero afterpulse probabilities compared to the SPADs Photon., Nature Publishing Group UK London, vol. 1
used in the present experiment. Future efforts can focus no. 3, pp. 165-171, 2007.
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