An energy-time entanglement-based dispersive optics quantum key distribution (DO-QKD) is demonstrated experimentally over optical fibers of 20 km. In the experiment, the telecom band energy-time entangled photon pairs are generated through spontaneous four-wave mixing in a silicon waveguide. The arrival time of photons is registered for key generation and security test. High-dimensional encoding in the arrival time of photons is used to increase the information per coincidence of photon pairs. The bin sifting process is optimized by a three-level structure, which significantly reduces the raw quantum bit error rate (QBER) due to timing jitters of detectors and electronics. A raw key generation rate of 151 kbps with a QBER of 4.95% is achieved, in a time bin encoding format with 4 bits per coincidence. This experiment shows that the entanglement-based DO-QKD can be implemented in an efficient and convenient way, which has great potential for quantum secure communication networks in the future.
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8 April 2019
Research Article|
April 10 2019
Energy-time entanglement-based dispersive optics quantum key distribution over optical fibers of 20 km
Xu Liu;
Xu Liu
1
Beijing National Research Center for Information Science and Technology (BNRist), Beijing Innovation Center for Future Chips, Electronic Engineering Department, Tsinghua University
, Beijing 100084, China
2
Beijing Academy of Quantum Information Sciences
, Beijing 100193, China
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Xin Yao;
Xin Yao
1
Beijing National Research Center for Information Science and Technology (BNRist), Beijing Innovation Center for Future Chips, Electronic Engineering Department, Tsinghua University
, Beijing 100084, China
2
Beijing Academy of Quantum Information Sciences
, Beijing 100193, China
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Heqing Wang;
Heqing Wang
3
State Key Laboratory of Functional Materials for Informatics, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences
, Shanghai 200050, China
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Hao Li;
Hao Li
3
State Key Laboratory of Functional Materials for Informatics, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences
, Shanghai 200050, China
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Zhen Wang;
Zhen Wang
3
State Key Laboratory of Functional Materials for Informatics, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences
, Shanghai 200050, China
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Lixing You
;
Lixing You
3
State Key Laboratory of Functional Materials for Informatics, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences
, Shanghai 200050, China
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Yidong Huang;
Yidong Huang
1
Beijing National Research Center for Information Science and Technology (BNRist), Beijing Innovation Center for Future Chips, Electronic Engineering Department, Tsinghua University
, Beijing 100084, China
2
Beijing Academy of Quantum Information Sciences
, Beijing 100193, China
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Wei Zhang
Wei Zhang
a)
1
Beijing National Research Center for Information Science and Technology (BNRist), Beijing Innovation Center for Future Chips, Electronic Engineering Department, Tsinghua University
, Beijing 100084, China
2
Beijing Academy of Quantum Information Sciences
, Beijing 100193, China
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a)
Electronic mail: zwei@tsinghua.edu.cn
Appl. Phys. Lett. 114, 141104 (2019)
Article history
Received:
January 22 2019
Accepted:
March 23 2019
Citation
Xu Liu, Xin Yao, Heqing Wang, Hao Li, Zhen Wang, Lixing You, Yidong Huang, Wei Zhang; Energy-time entanglement-based dispersive optics quantum key distribution over optical fibers of 20 km. Appl. Phys. Lett. 8 April 2019; 114 (14): 141104. https://doi.org/10.1063/1.5089784
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