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Photonic Quantum Computing

Phase-Randomized Laser Pulse Generation at 10 GHz for Quantum Photonic Applications

arXiv
Authors: Yuen San Lo, Adam H. Brzosko, Peter R. Smith, Robert I. Woodward, Davide G. Marangon, James F. Dynes, Sergio Juárez, Taofiq K. Paraïso, R. Mark Stevenson, Andrew J. Shields

Year

2026

Paper ID

4124

Status

Preprint

Abstract Read

~2 min

Abstract Words

110

Citations

N/A

Abstract

Gain-switching 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 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 effectively removes interpulse phase correlations and restores 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.

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  • This paper contributes to the Photonic Quantum Computing research area in the Quantum Articles archive.
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  • Gain-switching laser diodes is a well-established technique for generating optical pulses with random phases, where the quantum randomness arises naturally from spontaneous...

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References & Citation Signals

[1] DOI https://doi.org/arXiv:2601.04031 [2] arXiv https://arxiv.org/abs/2601.04031 [3] Publisher https://arxiv.org/abs/2601.04031

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