Chinese Optics Letters, Vol. 18, Issue 8, 082701 (2020)
High-quality quantum process tomography of time-bin qubit’s transmission over a metropolitan fiber network and its application
Peiyu Zhang, Liangliang Lu, Fangchao Qu, Xinhe Jiang, Xiaodong Zheng, Yanqing Lu, Shining Zhu, and Xiao-Song Ma*
- National Laboratory of Solid-state Microstructures, School of Physics, College of Engineering and Applied Sciences, Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210093, China
We employ quantum state and process tomography with time-bin qubits to benchmark a city-wide metropolitan quantum communication system. Over this network, we implement real-time feedback control systems for stabilizing the phase of the time-bin qubits and obtain a 99.3% quantum process fidelity to the ideal channel, indicating the high quality of the whole quantum communication system. This allows us to implement a field trial of high-performance quantum key distribution using coherent one way protocol with an average quantum bit error rate and visibility of 0.25% and 99.2% during 12 h over 61 km. Our results pave the way for the high-performance quantum network with metropolitan fibers.
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