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ACTA PHOTONICA SINICA

The Transmission of Polarized Light of Space Attitude in Quantum Communication

杨海马 YANG Hai-ma, 马彩文 MA Cai-wen, 王建宇 WANG Jian-yu, 张亮 ZHANG Liang, 刘瑾 LIU Jin, 黄元申 HUAN Yuan-shen

Published Jan 1, 2015• 0 citations
Publisher
DOI
10.3788/gzxb20154412.1227002

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Satellite networks and quantum communications offer complementary opportunities for enhanced operations. Quantum communications provide security for the transmissions between satellites and ground stations; while the free-space link of satellite networks provide the potential of long distance transmission of quantum bits (qubit) for space communications. However, with the promising advantages of the two approaches, challenges remain to fully develop quantum-based satellite communications such as robust and reliable information detection which is difficult to achieve due to the movement of satellites. In this paper, a tracking algorithm is proposed for polarization-encoded quantum satellite communications where polarization states are used to determine the bit transfer between the transmitter and receiver. The polarization tracking is essential for the decoding of a qubit and the quantum key distribution (QKD). A practical channel model for free-space quantum communications is adopted in this paper. With the estimated polarization, a novel dynamic polarization compensation scheme is also proposed. The results show that our methods can accurately estimate the polarization, providing much lower quantum bit error rate (QBER) by compensation, as compared with the direct qubit detection without polarization tracking and compensation scheme.