A monolithically integrated polarization entangled photon pair source on a silicon chip

Integrated photonic circuits are one of the most promising platforms for large-scale photonic quantum information systems due to their small physical size and stable interferometers with near-perfect lateral-mode overlaps. Since many quantum information protocols are based on qubits defined by the p...

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Bibliographic Details
Published in:Scientific reports 2012-11, Vol.2 (1), p.817-817, Article 817
Main Authors: Matsuda, Nobuyuki, Le Jeannic, Hanna, Fukuda, Hiroshi, Tsuchizawa, Tai, Munro, William John, Shimizu, Kaoru, Yamada, Koji, Tokura, Yasuhiro, Takesue, Hiroki
Format: Article
Language:English
Subjects:
639/301/1019/385
639/301/1019/482
639/624/400
639/766/483
Circuits
Humanities and Social Sciences
Information systems
Interfaces
Light sources
multidisciplinary
Optics
Photons
Physics
Polarization
Quantum Physics
Quantum theory
Science
Silica
Silicon
Superconductors
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Summary:Integrated photonic circuits are one of the most promising platforms for large-scale photonic quantum information systems due to their small physical size and stable interferometers with near-perfect lateral-mode overlaps. Since many quantum information protocols are based on qubits defined by the polarization of photons, we must develop integrated building blocks to generate, manipulate and measure the polarization-encoded quantum state on a chip. The generation unit is particularly important. Here we show the first integrated polarization-entangled photon pair source on a chip. We have implemented the source as a simple and stable silicon-on-insulator photonic circuit that generates an entangled state with 91 ± 2% fidelity. The source is equipped with versatile interfaces for silica-on-silicon or other types of waveguide platforms that accommodate the polarization manipulation and projection devices as well as pump light sources. Therefore, we are ready for the full-scale implementation of photonic quantum information systems on a chip.
ISSN:2045-2322
2045-2322
DOI:10.1038/srep00817