| ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL MECHANICS, AND FLUID DYNAMICS |
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Quantum key distribution transmitter chip based on hybrid-integration of silica and lithium niobates |
| Xiao Li(李骁)1,2,3, Liang-Liang Wang(王亮亮)1, Jia-shun Zhang(张家顺)1,†, Wei Chen(陈巍)4, Yue Wang(王玥)1,3, Dan Wu (吴丹)1,2,3, and Jun-Ming An (安俊明)1,3,‡ |
1 State Key Laboratory on Integrated Optoelectronics, Institute of Semiconductors, Chinese Academy of Sciences(CAS), Beijing 100083, China;
2 College of Materials Science and Opto-Electronic Technology, University of Chinese Academy of Sciences, Beijing 100049, China;
3 Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, China;
4 CAS Key Laboratory of Quantum Information, University of Science and Technology of China, Hefei 230026, China |
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Abstract A quantum key distribution transmitter chip based on hybrid-integration of silica planar light-wave circuit (PLC) and lithium niobates (LN) modulator PLC is presented. The silica part consists of a tunable directional coupler and 400-ps delay line, and the LN part is made up of a Y-branch, with electro-optic modulators on both arms. The two parts are facet-coupled to form an asymmetric Mach-Zehnder interferometer. We successfully encode and decode four BB84 states at 156.25-MHz repetition rate. Fast phase-encoding of 0 or $\pi $ is achieved, with interference fringe visibilities 78.53% and 82.68% for states $|+\rangle$ and $|-\rangle$, respectively. With the aid of an extra off-chip LN intensity modulator, two time-bin states are prepared and the extinction ratios are 18.65 dB and 15.46 dB for states $|0\rangle$ and $|1\rangle$, respectively.
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Received: 14 September 2021
Revised: 05 December 2021
Accepted manuscript online: 08 December 2021
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PACS:
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42.82.Bq
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(Design and performance testing of integrated-optical systems)
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42.82.Fv
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(Hybrid systems)
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42.50.Ex
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(Optical implementations of quantum information processing and transfer)
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| Fund: Project supported by the National Key Research and Development Program of China (Grant No. 2018YFA0306403), the National Natural Science Foundation of China (Grant Nos. 61435013 and 61627820), the Strategic Priority Research Program of the Chinese Academy of Sciences (Grant No. XDB43000000), and the K. C. Wong Education Foundation, Anhui Initiative in Quantum Information Technologies, China (Grant No. AHY030000). |
Corresponding Authors:
Jia-shun Zhang, Jun-Ming An
E-mail: zhangjiashun@semi.ac.cn;junming@semi.ac.cn
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Cite this article:
Xiao Li(李骁), Liang-Liang Wang(王亮亮), Jia-shun Zhang(张家顺), Wei Chen(陈巍), Yue Wang(王玥), Dan Wu (吴丹), and Jun-Ming An (安俊明) Quantum key distribution transmitter chip based on hybrid-integration of silica and lithium niobates 2022 Chin. Phys. B 31 064212
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