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Alternative title: パルス励起上方変換単一光子検出によるフェムト秒タイムビン量子ビットのデコーディングにおける結晶長最適化

Description:

In advancing ultrafast quantum communication and computing, it is crucial to
develop precise time-resolved measurement techniques for single-photon pulses. However,
the measurement of photonic qubits, especially time-bin qubits, is limited by the temporal
resolution of single-photon detectors, typically around tens of picoseconds. In this study, we
developed a pulse-pumped up-conversion single-photon detector (UCSPD) using periodically
poled Mg-doped stoichiometric lithium tantalate (PPMg: SLT) crystals of varying lengths to
optimize femtosecond up-conversion. We evaluated the UCSPD’s efficiency and temporal
resolution using a convolution model that accounts for group delay in nonlinear crystals. Our
results demonstrate that the model calculations enable the accurate prediction of the crystal
length dependence of temporal resolution and up-conversion efficiency without fitting parameters.
The UCSPD achieved 415 fs resolution and 10.1 % efficiency with a 2 mm crystal, enabling
successful characteriz

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• In Copyright
  © 2024 Optica Publishing Group under the terms of the Open Access Publishing Agreement. Users may use, reuse, and build upon the article, or use the article for text or data mining, so long as such uses are for noncommercial purposes and appropriate attribution is maintained. All other rights are reserved.

Keyword: 分極反転 , quantum telecom, sum frequency generation, optical sampling

Date published: 2024-12-16

Publisher: Optical Society of America

Journal:

• OPTICS EXPRESS (ISSN: 10944087) vol. 32 issue. 26

Funding:

Manuscript type: Publisher's version (Version of record)

MDR DOI:

First published URL: https://doi.org/10.1364/OE.542524

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Updated at: 2024-12-27 16:31:04 +0900

Published on MDR: 2025-02-17 18:32:32 +0900