On-demand storing time-bin qubit states with optical quantum memory

IF 3.5 2区物理与天体物理 Q2 PHYSICS, APPLIED

Applied Physics Letters Pub Date : 2025-03-10 DOI:10.1063/5.0255199

Ming-Shuo Sun, Chun-Hui Zhang, Yi-Zhen Luo, Shuang Wang, Yun Liu, Jian Li, Qin Wang

引用次数: 0

Abstract

Quantum memory, serving as a crucial device for storing and releasing quantum states, holds significant importance in long-distance quantum communications. To date, quantum memories have been realized in many different systems. However, most of them have complex structures and high cost. Besides, it is not easy to simultaneously achieve both high storage efficiency and fidelity. In this paper, we experimentally demonstrate a low-cost optical quantum memory with high efficiency and high fidelity, by utilizing a butterfly-shaped cavity consisting of one polarization beam splitter, two reflecting mirrors, and one pockels cell crystal. In order to quantify the quality of the quantum memory, we carry out tomography measurements on the time-bin qubits encoded with weak coherent states after storage for N rounds. The storage efficiency per round can reach up to 95.0%, and the overall state fidelity can exceed 99.1%. It thus seems very promising for practical implementation in quantum communication and networks.

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量子存储器是存储和释放量子态的关键设备，在远距离量子通信中具有重要意义。迄今为止，量子存储器已在许多不同的系统中实现。然而，它们大多结构复杂、成本高昂。此外，同时实现高存储效率和保真度也并非易事。在本文中，我们利用由一个偏振分束器、两个反射镜和一个痘胞晶体组成的蝶形腔，实验证明了一种具有高效率和高保真的低成本光量子存储器。为了量化量子存储器的质量，我们对存储 N 轮后用弱相干态编码的时间带量子比特进行了层析成像测量。每轮存储效率高达 95.0%，整体状态保真度超过 99.1%。因此，它在量子通信和网络中的实际应用前景非常广阔。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Applied Physics Letters 物理-物理：应用

CiteScore

6.40

自引率

10.00%

发文量

1821

审稿时长

1.6 months

期刊介绍： Applied Physics Letters (APL) features concise, up-to-date reports on significant new findings in applied physics. Emphasizing rapid dissemination of key data and new physical insights, APL offers prompt publication of new experimental and theoretical papers reporting applications of physics phenomena to all branches of science, engineering, and modern technology. In addition to regular articles, the journal also publishes invited Fast Track, Perspectives, and in-depth Editorials which report on cutting-edge areas in applied physics. APL Perspectives are forward-looking invited letters which highlight recent developments or discoveries. Emphasis is placed on very recent developments, potentially disruptive technologies, open questions and possible solutions. They also include a mini-roadmap detailing where the community should direct efforts in order for the phenomena to be viable for application and the challenges associated with meeting that performance threshold. Perspectives are characterized by personal viewpoints and opinions of recognized experts in the field. Fast Track articles are invited original research articles that report results that are particularly novel and important or provide a significant advancement in an emerging field. Because of the urgency and scientific importance of the work, the peer review process is accelerated. If, during the review process, it becomes apparent that the paper does not meet the Fast Track criterion, it is returned to a normal track.