加拿大国家研究委员会的Benjamin Sussman团队近日提出了测量超快Time-bin量子电码（qudits）的方法。相关研究成果于2023年2月22日发表在国际一流学术期刊《物理评论A》上。

该研究团队提出了一种有效的方法来测量Time-bin量子电码（qudits）的任意叠加态，并将其确定为4维。该方法基于皮秒时间尺度上的编码时间箱，也称为超快时间箱。这样，研究团队就可以在不同的测量基础上，利用鲁棒和相位稳定的单空间模时域干涉仪来测量Time-bin量子电码（qudits）。

据介绍，Time-bin量子电码（qudits）已经成为许多量子光子应用中很有前景的编码平台。然而，对Time-bin量子电码（qudits）的高效单次测量而非重构检测的要求限制了其在实验中的广泛应用。

附：英文原文

Title: Measuring ultrafast time-bin qudits

Author: Frédéric Bouchard, Kent Bonsma-Fisher, Khabat Heshami, Philip J. Bustard, Duncan England, Benjamin Sussman

Issue&Volume: 2023/02/22

Abstract: Time-bin qudits have emerged as a promising encoding platform in many quantum photonic applications. However, the requirement for efficient single-shot measurement of time-bin qudits instead of reconstructive detection has restricted their widespread use in experiments. Here, we propose an efficient method to measure arbitrary superposition states of time-bin qudits and confirm it up to dimension 4. This method is based on encoding time bins at the picosecond timescale, also known as ultrafast time bins. By doing so, we enable the use of robust and phase-stable single spatial mode temporal interferometers to measure time-bin qudit in different measurement bases.

DOI: 10.1103/PhysRevA.107.022618

Source: https://journals.aps.org/pra/abstract/10.1103/PhysRevA.107.022618