Contributed Talks 5c: Photonic integration (Chair: Moritz Kleinert)

contributed

Fri, 27 Aug , 15:45 - 16:15

System Integration of Photonic Integrated Quantum Communications Chips

Taofiq K Paraiso (Toshiba Europe Ltd); Thomas Roger (Toshiba Europe Ltd); Davide G Marangon (Toshiba Europe Ltd); Innocenzo De Marco (Toshiba Europe Ltd); Mirko Sanzaro (Toshiba Europe Ltd); Robert I Woodward (Toshiba Europe Ltd); James F Dynes (Toshiba Europe Ltd); Zhiliang Yuan (Toshiba Europe Ltd); Andrew J Shields (Toshiba Europe Ltd)

[abstract]
Abstract: Integrated photonics presents an opportunity for low-cost and highly-reproducible quantum cryptographic systems. However, due to numerous challenges such as packaging, power consumption and interfacing multiple chips in real, a standalone deployable photonic integrated system is still missing. Here we address all these challenges to present a real-time quantum communication system using integrated photonics. The system operated without intervention over multiple days and is capable of secure key rates of > 470 kbps over 10 km of fiber

[YouTube, presented by Taofiq Paraiso]

Presenter live session: Robert Woodward
High-rate quantum key distribution with silicon photonics

Likang Zhang (Hefei National Laboratory for Physical Sciences at the Microscale and Department of Modern Physics, University of Science and Technology of China, Hefei 230026, China); Wei Li (Hefei National Laboratory for Physical Sciences at the Microscale and Department of Modern Physics, University of Science and Technology of China, Hefei 230026, China); Hao Tan (Hefei National Laboratory for Physical Sciences at the Microscale and Department of Modern Physics, University of Science and Technology of China, Hefei 230026, China); Yan-Lin Tang (QuantumCTek Co., Ltd., Hefei, Anhui 230088, China); Kejin Wei (Hefei National Laboratory for Physical Sciences at the Microscale and Department of Modern Physics, University of Science and Technology of China, Hefei 230026, China); Sheng-Kai Liao (Hefei National Laboratory for Physical Sciences at the Microscale and Department of Modern Physics, University of Science and Technology of China, Hefei 230026, China); Cheng-Zhi Peng (Hefei National Laboratory for Physical Sciences at the Microscale and Department of Modern Physics, University of Science and Technology of China, Hefei 230026, China); Feihu Xu (Hefei National Laboratory for Physical Sciences at the Microscale and Department of Modern Physics, University of Science and Technology of China, Hefei 230026, China); Jian-Wei Pan (Hefei National Laboratory for Physical Sciences at the Microscale and Department of Modern Physics, University of Science and Technology of China, Hefei 230026, China)

[abstract]
Abstract: Quantum key distribution (QKD) can provide information-theoretic security governed by the law of quantum physics. Toward real-life applications, secret key rate is a key figure of merit of the QKD system. Here we demonstrate a 2.5-GHz polarization-encoding QKD system with an integrated silicon photonic transmitter that is able to generate a secret key rate of 2.42±0.04 Mbps over 101-km standard telecom fibers (19.6-dB loss). Such high rate attributes to the high clock-rate transmission and the ultra-low quantum bit error rate of 0.49%. The scalability, miniaturization and stability offered by silicon photonic technologies along with high-key-rate performance indicate that our system is a promising solution for large-scale deployment of QKD.

[YouTube, presented by Likang Zhang]

[slides]

Presenter live session: Likang Zhang
Realizing an entanglement-based multi-user quantum network with integrated photonics

Wenjun Wen (Nanjing University); Zhiyu Chen (Nanjing University); Liangliang Lu (Nanjing University); Wenhan Yan (Nanjing University); Peiyu zhang (Nanjing University); Yanqing Lu (Nanjing University); Shining Zhu (Nanjing University); Xiao-Song Ma (Nanjing University)

[abstract]
Abstract: Quantum network facilitates the secure transmission of information between different users. Establishing communication links among multiple users in a scalable and efficient way is important for realizing large-scale quantum network. Here we develop a time-energy entanglement-based dense wavelength division multiplexed network based on an integrated silicon nitride micro-ring resonator, which offers a wide frequency span (>100 nm) and narrow bandwidth modes (~ 5 pm). Six pairs of photons are selected to form a fully and simultaneously connected four-user quantum network. The observed quantum interference visibilities are well above the classical limits among all users. Our result paves the way for realizing large-scale quantum networks with integrated photonic architecture.

[YouTube, presented by Wenjun Wen]

[slides]

Presenter live session: Wenjun Wen