Bulletin of the American Physical Society
APS March Meeting 2024
Monday–Friday, March 4–8, 2024; Minneapolis & Virtual
Session Q53: Quantum Networks: Modeling, Components and Demonstrations
3:00 PM–5:36 PM,
Wednesday, March 6, 2024
Room: 202AB
Sponsoring
Unit:
DQI
Chair: Allen Zang, University of Chicago
Abstract: Q53.00011 : Implementation of the RRDPS QKD protocol using time-domain Fourier transform via space-time duality*
5:00 PM–5:12 PM
Presenter:
Yusuke Murakami
(Hokkaido University)
Authors:
Yusuke Murakami
(Hokkaido University)
Akihisa Tomita
(Hokkaido University)
Atsushi Okamoto
(Hokkaido University)
In the RRDPS protocol, the pulse train containing phase information is divided into two parts. One part is randomly delayed to interfere with the other, and the interference signal is used to generate the key. A conventional method utilizes optical switches to achieve variable-delay interferometry. However, optical switches have a typical response time of microseconds, which restricts the key rate.
To address this issue, we have developed a new and simple optical circuit that uses Fourier transform and phase modulation to generate a variable delay to the pulse. This method eliminates the slow optical switches and boosts the transmission rate of the RRDPS protocol.
Furthermore, we use the space-time duality technique to implement the Fourier transform in the time domain, rather than the space domain. This technique offers a simple and cost-effective solution for electrical control of pulse delay, paving the way for practical applications.
*We acknowledge the assistance of the Ministry of Internal Affairs and Communications (MIC) under the initiative Research and Development for Construction of a Global Quantum Cryptography Network.
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