# Optimization of crystal length in a  pulse-pumped up-conversion single-photon detector for decoding femtosecond time-bin qubits

https://mdr.nims.go.jp/datasets/b7124cfd-9681-4141-8ffa-de8056000708

## File

- [SFG sampling_oe-32-26-47549.pdf](https://mdr.nims.go.jp/filesets/73751a2c-0585-4ede-8ac9-2e1049d685ca/download) ([Detail](https://mdr.nims.go.jp/filesets/73751a2c-0585-4ede-8ac9-2e1049d685ca.md))

## Id

b7124cfd-9681-4141-8ffa-de8056000708

## Local identifier



## Visibility

open_to_public

## State

published

## Created at

2024-12-27T02:34:46.456618Z

## Updated at

2024-12-27T07:31:04.026802Z

## Published at

2025-02-17T09:32:32.942669Z

## Doi



## First published url

https://doi.org/10.1364/OE.542524

## Date published

2024-12-16

## Recorded date published

2024

## Resource type

journal_article

## Manuscript type

vor

## Collection



## Title

- 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
  title_type: alternative
  lang: ja
- title: Optimization of crystal length in a  pulse-pumped up-conversion single-photon
    detector for decoding femtosecond time-bin qubits
  title_type: original
  lang: en

## Description

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

## Creator

- name: Yuta Kochi
  role: author
- name: Sunao Kurimura
  role: author
  orcid: https://orcid.org/0000-0001-5220-1873
  organization: National Institute for Materials Science
  department: Research Center for Electronic and Optical Materials/Optical Materials
    Field/Quantum Photonics Group
  ror: https://ror.org/026v1ze26
- name: Junko Ishi-Hayase
  role: author

## Contact agent



## Publisher

organization: Optical Society of America

## Managing organization



## Keyword

- subject: quantum telecom
  schema: not_defined
- subject: sum frequency generation
  schema: not_defined
- subject: optical sampling
  schema: not_defined
- subject: 分極反転
  schema: not_defined

## Rights

- description: "© 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."
  identifier: http://rightsstatements.org/vocab/InC/1.0/

## Other identifier(s)



## Data origin

- data_origin_type: other

## Embargo



## Journal

- title: OPTICS EXPRESS
  issn: '10944087'
  volume: '32'
  issue: '26'

## Conference



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## Measurement method



## Specimen



## Chemical composition



## Structure for specimen



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## Fileset

- id: 73751a2c-0585-4ede-8ac9-2e1049d685ca
  filename: SFG sampling_oe-32-26-47549.pdf
  content_type: application/pdf
  size: 2940877
  md5: 8e8a2faeff837f4f106964893031f24f

## Thumbnail

fileset_id: 73751a2c-0585-4ede-8ac9-2e1049d685ca
filename: SFG sampling_oe-32-26-47549.pdf