An on-chip coupled resonator optical waveguide single-photon buffer

Hiroki Takesue (), Nobuyuki Matsuda, Eiichi Kuramochi, William J. Munro and Masaya Notomi
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Hiroki Takesue: NTT Basic Research Laboratories, NTT Corporation
Nobuyuki Matsuda: NTT Basic Research Laboratories, NTT Corporation
Eiichi Kuramochi: NTT Basic Research Laboratories, NTT Corporation
William J. Munro: NTT Basic Research Laboratories, NTT Corporation
Masaya Notomi: NTT Basic Research Laboratories, NTT Corporation

Nature Communications, 2013, vol. 4, issue 1, 1-7

Abstract: Abstract 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.

Date: 2013
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DOI: 10.1038/ncomms3725

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