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4 results on '"Yang-Fan Jiang"'

1. Remote blind state preparation with weak coherent pulses in the field

Author

Hoi-Kwong Lo, Qi-Chao Sun, Yu-Zhe Zhang, Yang-Fan Jiang, Liang Huang, Hao Li, Weijun Zhang, Feihu Xu, Qiang Zhang, Jian-Wei Pan, Lixing You, Zhen Wang, Ke Xu, and Kejin Wei

Subjects
Quantum Physics, Field (physics), Computer science, business.industry, Computation, Electrical engineering, FOS: Physical sciences, General Physics and Astronomy, Cloud computing, 01 natural sciences, 010309 optics, Quantum state, Qubit, 0103 physical sciences, Quantum Physics (quant-ph), 010306 general physics, business, Quantum, Quantum teleportation, Quantum computer, Computer Science::Cryptography and Security
Abstract

Quantum computing has seen tremendous progress in the past years. Due to the implementation complexity and cost, the future path of quantum computation is strongly believed to delegate computational tasks to powerful quantum servers on cloud. Universal blind quantum computing (UBQC) provides the protocol for the secure delegation of arbitrary quantum computations, and it has received significant attention. However, a great challenge in UBQC is how to transmit quantum state over long distance securely and reliably. Here, we solve this challenge by proposing and demonstrating a resource-efficient remote blind qubit preparation (RBQP) protocol with weak coherent pulses for the client to produce, using a compact and low-cost laser. We demonstrate the protocol in field, experimentally verifying the protocol over 100-km fiber. Our experiment uses a quantum teleportation setup in telecom wavelength and generates $1000$ secure qubits with an average fidelity of $(86.9\pm1.5)\%$, which exceeds the quantum no-cloning fidelity of equatorial qubit states. The results prove the feasibility of UBQC over long distances, and thus serving as a key milestone towards secure cloud quantum computing., 11 pages, 9 figures

Published
2019

2. Remote Blind State Preparation with Weak Coherent Pulses in the Field.

Author

Yang-Fan Jiang, Kejin Wei, Liang Huang, Ke Xu, Qi-Chao Sun, Yu-Zhe Zhang, Weijun Zhang, Hao Li, Lixing You, Zhen Wang, Hoi-Kwong Lo, Feihu Xu, Qiang Zhang, and Jian-Wei Pan

Subjects
*QUANTUM teleportation, *QUANTUM measurement, *QUANTUM computing, *QUANTUM states, *QUBITS, *LASER ultrasonics
Abstract

Quantum computing has seen tremendous progress in past years. Due to implementation complexity and cost, the future path of quantum computation is strongly believed to delegate computational tasks to powerful quantum servers on the cloud. Universal blind quantum computing (UBQC) provides the protocol for the secure delegation of arbitrary quantum computations, and it has received significant attention. However, a great challenge in UBQC is how to transmit a quantum state over a long distance securely and reliably. Here, we solve this challenge by proposing a resource-efficient remote blind qubit preparation (RBQP) protocol, with weak coherent pulses for the client to produce, using a compact and low-cost laser. We experimentally verify a key step of RBQP--quantum nondemolition measurement--in the field test over 100 km of fiber. Our experiment uses a quantum teleportation setup in the telecom wavelength and generates 1000 secure qubits with an average fidelity of (86.9 ± 1.5)%, which exceeds the quantum no-cloning fidelity of equatorial qubit states. The results prove the feasibility of UBQC over long distances, and thus serves as a key milestone towards secure cloud quantum computing. [ABSTRACT FROM AUTHOR]

Published
2019
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3. Entanglement swapping with independent sources over an optical-fiber network.

Author

Qi-Chao Sun, Ya-Li Mao, Yang-Fan Jiang, Qi Zhao, Si-Jing Chen, Wei Zhang, Wei-Jun Zhang, Xiao Jiang, Teng-Yun Chen, Li-Xing You, Li Li, Yi-Dong Huang, Xian-Feng Chen, Zhen Wang, Xiongfeng Ma, Qiang Zhang, and Jian-Wei Pan

Subjects
*OPTICAL fiber networks, *QUANTUM networks (Optics), *BELL'S theorem
Abstract

Establishing entanglement between two remote systems by the method of entanglement swapping is an essential step for a long-distance quantum network. Here we report a field-test entanglement swapping experiment with two independent telecommunication band entangled photon-pair sources over an optical fiber network in Hefei. The two sources are located at two nodes that are 12.5 km apart and the Bell-state measurement is performed at a third location which is connected to the two source nodes with 14.7-km and 10.6-km optical fibers, respectively. The observed average visibility is 79.9 ± 4.8%, which is sufficient for the violation of Bell inequalities. Furthermore, with the swapped entanglement, we demonstrate a source-independent quantum key distribution, which is also immune to any detection attacks at the measurement site. [ABSTRACT FROM AUTHOR]

Published
2017
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4. Long-Distance Free-Space Measurement-Device-Independent Quantum Key Distribution.

Author

Yuan Cao, Yu-Huai Li, Kui-Xing Yang, Yang-Fan Jiang, Shuang-Lin Li, Xiao-Long Hu, Maimaiti Abulizi, Cheng-Long Li, Weijun Zhang, Qi-Chao Sun, Wei-Yue Liu, Xiao Jiang, Sheng-Kai Liao, Ji-Gang Ren, Hao Li, Lixing You, Zhen Wang, Juan Yin, Chao-Yang Lu, and Xiang-Bin Wang

Subjects
*ATMOSPHERIC turbulence, *ADAPTIVE optics, *PHOTONS, *SYNCHRONIZATION
Abstract

Measurement-device-independent quantum key distribution (MDI-QKD), based on two-photon interference, is immune to all attacks against the detection system and allows a QKD network with untrusted relays. Since the MDI-QKD protocol was proposed, fiber-based implementations aimed at longer distance, higher key rates, and network verification have been rapidly developed. However, owing to the effect of atmospheric turbulence, MDI-QKD over a free-space channel remains experimentally challenging. Herein, by developing a robust adaptive optics system, high-precision time synchronization and frequency locking between independent photon sources located far apart, we realized the first free-space MDI-QKD over a 19.2-km urban atmospheric channel, which well exceeds the effective atmospheric thickness. Our experiment takes the first step toward satellite-based MDI-QKD. Moreover, the technology developed herein opens the way to quantum experiments in free space involving long-distance interference of independent single photons. [ABSTRACT FROM AUTHOR]

Published
2020
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