论文标题
自由空间量子通信的稳定，低误差和无校准的极化编码器
Stable, low-error and calibration-free polarization encoder for free-space quantum communication
论文作者
论文摘要
极化编码的自由空间量子通信需要具有快速极化调制，长期稳定性和较低固有错误率的量子状态源。在这里，我们提出了一个基于SAGNAC干涉仪的来源，由维持纤维，纤维极化束分离器和电磁相调节器组成。该系统在自由空间中以固定参考框架生成预定的极化状态，该状态不需要在发射器和接收器处校准。通过这种方式，我们达到了长期稳定性和低错误率。还报道了概念验证实验，证明了几个小时内的量子位错误率低于0.2％，而没有任何主动重新校准设备。
Polarization-encoded free-space Quantum Communication requires a quantum state source featuring fast polarization modulation, long-term stability and a low intrinsic error rate. Here we present a source based on a Sagnac interferometer and composed of polarization maintaining fibers, a fiber polarization beam splitter and an electro-optic phase modulator. The system generates predetermined polarization states with a fixed reference frame in free-space that does not require calibration neither at the transmitter nor at the receiver. In this way we achieve long-term stability and low error rates. A proof-of-concept experiment is also reported, demonstrating a Quantum Bit Error Rate lower than 0.2% for several hours without any active recalibration of the devices.
