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  • Letter
  • Open Access

Scalable implementation of (d+1) mutually unbiased bases for d-dimensional quantum key distribution

Takuya Ikuta1,2,*, Seiseki Akibue3,†, Yuya Yonezu1, Toshimori Honjo1, Hiroki Takesue1, and Kyo Inoue2

  • 1NTT Basic Research Laboratories, NTT Corporation, 3-1 Morinosato Wakamiya, Atsugi, Kanagawa 243-0198, Japan
  • 2Graduate School of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka 565-0871, Japan
  • 3NTT Communication Science Laboratories, NTT Corporation, 3-1 Morinosato Wakamiya, Atsugi, Kanagawa 243-0198, Japan

  • *takuya.ikuta.xu@hco.ntt.co.jp
  • †seiseki.akibue.rb@hco.ntt.co.jp
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Phys. Rev. Research 4, L042007 – Published 12 October, 2022

DOI: https://doi.org/10.1103/PhysRevResearch.4.L042007

Abstract

A high-dimensional quantum key distribution (QKD) can improve error rate tolerance and the secret key rate. Many d-dimensional QKDs have used two mutually unbiased bases (MUBs), while (d+1) MUBs enable a more robust QKD, especially against correlated errors. However, a scalable implementation has not been achieved because the setups have required d devices even for two MUBs or a flexible convertor for a specific optical mode. Here, we propose a scalable and general implementation of (d+1) MUBs using logpd interferometers in prime power dimensions d=pN. We implemented the setup for time-bin states and observed an average error rate of 3.8% for phase bases, which is lower than the 23.17% required for a secure QKD against coherent attack in d=4.

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Phys. Rev. Research 4, L042007– Published 12 October, 2022
  • Received 6 April 2022
  • Accepted 14 September 2022
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Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.

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