aiqbench analysis
This research introduces a novel method using external spontaneous emission sources to eliminate phase correlations in gain-switched laser diodes, enabling phase randomization at 10 GHz repetition rates. By overcoming the traditional limits of phase diffusion, this advancement significantly enhances the performance and speed of quantum key distribution and quantum random number generation systems. The work represents a critical infrastructure improvement for high-rate photonic quantum applications rather than a general consumer tech update.
Phase-Randomized Laser Pulse Generation at 10 GHz for Quantum Photonic Applications
arXiv:2601.04031v3 Announce Type: replace Abstract: Gain-switching of laser diodes is a well-established technique for generating optical pulses with random phases, where the quantum randomness arises naturally from spontaneous emission. However, the maximum switching rate is limited by the time required for phase diffusion: at high repetition rates, residual photons in the cavity seed subsequent pulses, leading to phase correlations, which degrade randomness. We present a method to overcome this limitation by employing an external source of spontaneous emission in conjunction with the laser. Our results show that this approach substantially suppresses interpulse phase correlations, restoring phase randomization at repetition rates as high as 10 GHz. This technique opens new opportunities for high-rate quantum key distribution and quantum random number generation.
Abstract:Gain-switching of laser diodes is a well-established technique for generating optical pulses with random phases, where the quantum randomness arises naturally from spontaneous emission. However, the maximum switching rate is limited by the time required for phase diffusion: at high repetition rates, residual photons in the cavity seed subsequent pulses, leading to phase correlations, which degrade randomness. We present a method to overcome this limitation by employing an external source of spontaneous emission in conjunction with the laser. Our results show that this approach substantially suppresses interpulse phase correlations, restoring phase randomization at repetition rates as high as 10 GHz. This technique opens new opportunities for high-rate quantum key distribution and quantum random number generation.
arXiv:2601.04031 [quant-ph]
(or arXiv:2601.04031v3 [quant-ph] for this version)
https://doi.org/10.48550/arXiv.2601.04031 Focus to learn more arXiv-issued DOI via DataCite
https://doi.org/10.1063/5.0321309 Focus to learn more DOI(s) linking to related resources
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