2013/11/12 by Hiroki Takesue, Nobuyuki Matsuda, Eiichi Kuramochi +2 · 73 citations
Computer Science · Engineering · Physics and Astronomy · #Buffer (optical fiber) #Chip #Computer science #Electronic circuit #Mechanical and Optical Resonators #Neural Networks and Reservoir Computing #Optics #Optoelectronics #Photon #Photonic and Optical Devices #Photonic integrated circuit #Photonics #Physics #Quantum #Quantum entanglement #Quantum information #Quantum mechanics #Resonator #Telecommunications #Waveguide #physics.optics #quant-ph
paper · pdf · doi:10.1038/ncomms3725
published in Nature Communications 4(1), 2725 (Nature Portfolio) · 6 pages, 4 figures. First draft. Typo corrected
openalex publication_date 2013/11/12 · arxiv created 2013/11/14 · arxiv updated 2013/11/15 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
Integrated quantum optical circuits are now seen as one of the most promising approaches with which to realize single-photon quantum information processing. Many of the core elements for such circuits have been realized, including sources, gates and detectors. However, a significant missing function necessary for photonic quantum information processing on-chip is a buffer, where single photons are stored for a short period of time to facilitate circuit synchronization. Here we report an on-chip single-photon buffer based on coupled resonator optical waveguides (CROW) consisting of 400 high-Q photonic crystal line-defect nanocavities. By using the CROW, a pulsed single photon is successfully buffered for 150 ps with 50-ps tunability while maintaining its non-classical properties. Furthermore, we show that our buffer preserves entanglement by storing and retrieving one photon from a time-bin entangled state. This is a significant step towards an all-optical integrated quantum information processor.