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Simple quantum key distribution with qubit-based synchronization and a self-compensating polarization encoder
Optica ( IF 10.4 ) Pub Date : 2020-04-02 , DOI: 10.1364/optica.381013
Costantino Agnesi , Marco Avesani , Luca Calderaro , Andrea Stanco , Giulio Foletto , Mujtaba Zahidy , Alessia Scriminich , Francesco Vedovato , Giuseppe Vallone , Paolo Villoresi

Quantum key distribution (QKD) relies on quantum communication to allow distant parties to share a secure cryptographic key. Widespread adoption of QKD in current telecommunication networks will require the development of simple, low-cost, and stable systems. However, current QKD implementations usually include additional hardware that perform auxiliary tasks such as temporal synchronization and polarization basis tracking. Here we present a polarization-based QKD system operating at 1550 nm that performs synchronization and polarization compensation by exploiting only the hardware already needed for the quantum communication task. Polarization encoding is performed by a self-compensating Sagnac loop modulator that exhibits high temporal stability and the lowest intrinsic quantum bit error rate reported so far. The QKD system was tested over a fiber-optic link, demonstrating tolerance up to about 40 dB of channel losses. Due to its reduced hardware requirements and the quality of the source, this work represents an important step towards technologically mature QKD systems.

中文翻译:

具有基于量子位的同步和自补偿极化编码器的简单量子密钥分配

量子密钥分发(QKD)依赖于量子通信,以允许远方共享安全的加密密钥。QKD在当前电信网络中的广泛采用将需要开发简单,低成本和稳定的系统。但是,当前的QKD实现通常包括执行辅助任务(例如时间同步和极化基础跟踪)的附加硬件。在这里,我们介绍一种工作在1550 nm处的基于极化的QKD系统,该系统仅利用量子通信任务所需的硬件来执行同步和极化补偿。极化编码由自补偿的Sagnac环路调制器执行,该调制器显示出高的时间稳定性和迄今为止报道的最低的固有量子误码率。QKD系统在光纤链路上进行了测试,展示了高达40 dB的信道损耗容限。由于其降低的硬件要求和源质量,这项工作代表了迈向技术成熟的QKD系统的重要一步。
更新日期:2020-04-02
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