Author(s): You, J (You, Jin); Wang, Y (Wang, Yue); Han, Q (Han, Qin); An, JM (An, Junming)

Source: OPTICS AND LASER TECHNOLOGY Volume: 145 Article Number: 107505 DOI: 10.1016/j.optlastec.2021.107505 Published: JAN 2022

Abstract: Silica-silicon planar lightwave circuit (PLC) has the advantages of miniaturization, low cost, and low loss, and it provides a stable, highly integrated, and practical platform for quantum key distribution (QKD). A quantum decoding chip based on this platform which have potential to be compatible for multi-protocols has been designed and measured. The chip consists of three variable optical splitters (VOSs), two Mach-Zehnder interferometers (AMZIs) and four variable directional couplers (VDCs). The results of experiment show that the chip can achieve up to 98.6% interference visibility with measured delay times of 405 ps and 402 ps for two AMZI respectively under temperature control. The extinction ratio for the phase states is kept between 23 and 25 dB for 6 h without active phase correction. The chip has advantageous to achieve high interference visibilities and low quantum bits error rate (QBER).

Accession Number: WOS:000697290000006

ISSN: 0030-3992

eISSN: 1879-2545

Full Text: https://www.sciencedirect.com/science/article/pii/S0030399221005934?via%3Dihub