Journal
OPTICS EXPRESS
Volume 25, Issue 16, Pages 18940-18949Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.25.018940
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Funding
- Natural Sciences and Engineering Research Council of Canada (NSERC)
- MESI PSR-SIIRI Initiative
- Canada Research Chair Program
- Australian Research Council Discovery Projects [DP150104327]
- European Union's Horizon 2020 research and innovation program under the Marie Sklodowska-Curie grant [656607]
- CityU SRG-Fd program [7004189]
- Chinese Academy of Sciences [XDB24030300]
- People Programme (Marie Curie Actions) of the European Union's FP7 Programme under REA [INCIPIT (PIOF-GA-2013-625466)]
- Government of the Russian Federation [074U 01]
- 1000 Talents Sichuan Program (China)
- Marie Curie Actions (MSCA) [656607] Funding Source: Marie Curie Actions (MSCA)
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The on-chip generation of large and complex optical quantum states will enable low-cost and accessible advances for quantum technologies, such as secure communications and quantum computation. Integrated frequency combs are on-chip light sources with a broad spectrum of evenly-spaced frequency modes, commonly generated by four-wave mixing in optically-excited nonlinear micro-cavities, whose recent use for quantum state generation has provided a solution for scalable and multi-mode quantum light sources. Pulsed quantum frequency combs are of particular interest, since they allow the generation of single-frequency-mode photons, required for scaling state complexity towards, e.g., multi-photon states, and for quantum information applications. However, generation schemes for such pulsed combs have, to date, relied on micro-cavity excitation via lasers external to the sources, being neither versatile nor power-efficient, and impractical for scalable realizations of quantum technologies. Here, we introduce an actively-modulated, nested-cavity configuration that exploits the resonance pass-band characteristic of the micro-cavity to enable a mode-locked and energy-efficient excitation. We demonstrate that the scheme allows the generation of high-purity photons at large coincidence-to-accidental ratios (CAR). Furthermore, by increasing the repetition rate of the excitation field via harmonic mode-locking (i.e. driving the cavity modulation at harmonics of the fundamental repetition rate), we managed to increase the pair production rates (i.e. source efficiency), while maintaining a high CAR and photon purity. Our approach represents a significant step towards the realization of fully on-chip, stable, and versatile sources of pulsed quantum frequency combs, crucial for the development of accessible quantum technologies. (C) 2017 Optical Society of America
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