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1. Ultra-low loss quantum photonic circuits integrated with single quantum emitters

   https://doi.org/10.1038/s41467-022-35332-z  

   Chanana, Ashish; Larocque, Hugo; Moreira, Renan; Carolan, Jacques; Guha, Biswarup; Melo, Emerson G.; Anant, Vikas; Song, Jindong; Englund, Dirk; Blumenthal, Daniel J.; et al (December 2022, Nature Communications)

   Abstract The scaling of many photonic quantum information processing systems is ultimately limited by the flux of quantum light throughout an integrated photonic circuit. Source brightness and waveguide loss set basic limits on the on-chip photon flux. While substantial progress has been made, separately, towards ultra-low loss chip-scale photonic circuits and high brightness single-photon sources, integration of these technologies has remained elusive. Here, we report the integration of a quantum emitter single-photon source with a wafer-scale, ultra-low loss silicon nitride photonic circuit. We demonstrate triggered and pure single-photon emission into a Si₃N₄photonic circuit with ≈ 1 dB/m propagation loss at a wavelength of ≈ 930 nm. We also observe resonance fluorescence in the strong drive regime, showing promise towards coherent control of quantum emitters. These results are a step forward towards scaled chip-integrated photonic quantum information systems in which storing, time-demultiplexing or buffering of deterministically generated single-photons is critical. 

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2. Indistinguishable photons from an artificial atom in silicon photonics

   https://doi.org/10.1038/s41467-024-51265-1  

   Komza, Lukasz; Samutpraphoot, Polnop; Odeh, Mutasem; Tang, Yu-Lung; Mathew, Milena; Chang, Jiu; Song, Hanbin; Kim, Myung-Ki; Xiong, Yihuang; Hautier, Geoffroy; et al (August 2024, Nature Communications)

   Abstract Silicon is the ideal material for building electronic and photonic circuits at scale. Integrated photonic quantum technologies in silicon offer a promising path to scaling by leveraging advanced semiconductor manufacturing and integration capabilities. However, the lack of deterministic quantum light sources and strong photon-photon interactions in silicon poses a challenge to scalability. In this work, we demonstrate an indistinguishable photon source in silicon photonics based on an artificial atom. We show that a G center in a silicon waveguide can generate high-purity telecom-band single photons. We perform high-resolution spectroscopy and time-delayed two-photon interference to demonstrate the indistinguishability of single photons emitted from a G center in a silicon waveguide. Our results show that artificial atoms in silicon photonics can source single photons suitable for photonic quantum networks and processors. 

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3. Stark Tuning and Resonant Excitation of Hybrid Integrated Telecom Single-Photon Sources

   https://doi.org/10.1364/CLEO_FS.2023.FTu3C.7  

   Larocque, Hugo; Buyukkaya, Mustafa Atabey; Errando-Herranz, Carlos; Harper, Samuel; Carolan, Jacques; Leake, Gerald L.; Coleman, Daniel J.; Fanto, Michael L.; Waks, Edo; Englund, Dirk (January 2023, Optica Publishing Group)

   We introduce hybrid integrated telecom single-photon sources on a commercial foundry multilayer silicon photonic chip. We show above-band and resonant waveguide-coupled single-photon emission tunable via the DC Stark shift. 

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4. Room-Temperature Silicon Nitride Quantum Emitters for Advancing Quantum Key Distribution

   https://doi.org/10.1364/CLEO_FS.2024.FTu3O.8  

   Senichev, Alexander; Martin, Zachariah O; Peana, Samuel; Kryvobok, Artem; Lagutchev, Alexei S; Boltasseva, Alexandra; Shalaev, Vladimir M (January 2024, Optica Publishing Group)

   Newly discovered silicon nitride quantum emitters hold great promise for industrial-scale quantum photonic applications. We assess the performance of intrinsic room-temperature SiN single-photon emitters for quantum key distribution, showcasing their exceptional brightness and single-photon purity. 

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5. Tunable quantum emitters on large-scale foundry silicon photonics

   https://doi.org/10.1038/s41467-024-50208-0  

   Larocque, Hugo; Buyukkaya, Mustafa_Atabey; Errando-Herranz, Carlos; Papon, Camille; Harper, Samuel; Tao, Max; Carolan, Jacques; Lee, Chang-Min; Richardson, Christopher_J_K; Leake, Gerald_L; et al (July 2024, Nature Communications)

   Abstract Controlling large-scale many-body quantum systems at the level of single photons and single atomic systems is a central goal in quantum information science and technology. Intensive research and development has propelled foundry-based silicon-on-insulator photonic integrated circuits to a leading platform for large-scale optical control with individual mode programmability. However, integrating atomic quantum systems with single-emitter tunability remains an open challenge. Here, we overcome this barrier through the hybrid integration of multiple InAs/InP microchiplets containing high-brightness infrared semiconductor quantum dot single photon emitters into advanced silicon-on-insulator photonic integrated circuits fabricated in a 300 mm foundry process. With this platform, we achieve single-photon emission via resonance fluorescence and scalable emission wavelength tunability. The combined control of photonic and quantum systems opens the door to programmable quantum information processors manufactured in leading semiconductor foundries. 

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