期刊
PHOTONICS RESEARCH
卷 10, 期 7, 页码 1533-1542出版社
CHINESE LASER PRESS
DOI: 10.1364/PRJ.452539
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资金
- National Key Research and Development Program of China [2018YFB1107205, 2016YFA0301302]
- National Natural Science Foundation of China [12134001, 61590933, 61590932, 11527901, 11774333, 62061160487]
- Strategic Priority Research Program of the Chinese Academy of Sciences (CAS) [XDB24030601]
- Fundamental Research Funds for the Central Universities
- Joint Fund for Equipment Pre-research Space Science and Technology [6141B06140601]
This study successfully fabricates an on-chip path encoded photonic quantum Toffoli gate and demonstrates high truth-table fidelity using an optimized 3D configuration and overpass waveguide. Furthermore, a path encoded four-qubit controlled-controlled-controlled NOT gate is written to confirm the scalability of this resource-saving technique.
The quantum Toffoli gate is one of the most important three-qubit gates, but it is challenging to construct a chip according to the complicated traditional circuit. Using the optimized 3D configuration with an overpass waveguide to reduce the circuit complexity, we successfully fabricate an on-chip path encoded photonic quantum Toffoli gate enabled by the 3D capability of the femtosecond laser direct writing (FLDW) for the first time to our knowledge, whose truth-table fidelity is higher than 85.5%. Furthermore, a path encoded four-qubit controlled-controlled-controlled NOT gate is written to confirm the scalability of this resource-saving technique. This work paves the way for the FLDW of more complex and powerful photonic quantum computation chips. (C) 2022 Chinese Laser Press
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