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- W3208144148 abstract "Intensity modulation in Weak Coherent State (WCS)-based Quantum Key Distribution can be achieved either by using an external optical modulator positioned after a laser diode or direct modulation of the laser diode injection current. Former approach requires an additional optical modulator and a dedicated driver circuit, which increases cost of implementation. The latter approach, as reported, results in distinguishable signal and decoy state. We have considered a quantum well based gain switched laser diode and analyzed cause of distinguishability in directly modulated laser diodes. In addition, we have proposed a method of generation of indistinguishable signal and decoy state by direct modulation of injected current into the laser diode. In this work, we estimate parameters affecting the distinguishability of signal and decoy state for small signal laser diode models, theoretically characterize emission of a laser diode, and using numerical simulation extended our analysis to large signal excitation of the laser diode. Experimental results align with trend predicted by numerical simulation for large signal excitation. Statistically, we further evaluate indistinguishability of signal and decoy state. The proposed implementation of QKD will be cheaper and have smaller form factor." @default.
- W3208144148 created "2021-11-08" @default.
- W3208144148 creator A5085279717 @default.
- W3208144148 date "2021-11-02" @default.
- W3208144148 modified "2023-09-27" @default.
- W3208144148 title "Towards Generation of Indistinguishable Decoy State-Glauber State using a Tuned Laser Diode" @default.
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