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High quantum-efficiency photon-number-resolving detector for photonic on-chip information processing.

Brice Calkins, Paolo L Mennea, Adriana E Lita

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    |October 10, 2013
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    Summary

    We developed an integrated photonic system with high-efficiency photon detectors for quantum applications. This system achieves high detection efficiency, enabling precise photon-number discrimination in optical circuits.

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    Area of Science:

    • Quantum optics
    • Integrated photonics
    • Nanotechnology

    Background:

    • Integrated optical circuits are crucial for quantum information networks.
    • High-efficiency photon detectors with number discrimination are essential components.
    • Existing detectors face limitations in efficiency and integration.

    Purpose of the Study:

    • To present an integrated photonic system for quantum applications.
    • To demonstrate a high-efficiency photon detector capable of photon-number discrimination.
    • To enable predictable detector placement within photonic circuits.

    Main Methods:

    • Utilized UV-written silica-on-silicon waveguides.
    • Employed modified transition-edge sensors for photon detection.
    • Multiplexed three detectors in series, exploiting mode transmission failure.

    Main Results:

    • Achieved over 40% efficiency per detector at 1550 nm.
    • Demonstrated a combined detection efficiency of 79% ± 2% in a single pass.
    • Reached 88% ± 3% efficiency with an on-chip reflection grating.
    • Confirmed no significant unexplained system loss from scattering or reflections.

    Conclusions:

    • The developed waveguide and detector system offers predictable efficiency.
    • Enables number-resolving single-photon detectors at arbitrary locations in photonic circuits.
    • Presents a significant advancement for quantum optical applications and information networks.