scholarly journals Femtosecond laser direct writing of optical quantum logic gates

2019 ◽  
Vol 68 (10) ◽  
pp. 104205
Author(s):  
Qian Zhang ◽  
Meng Li ◽  
Qi-Huang Gong ◽  
Yan Li
Keyword(s):  
Femtosecond Laser ◽  
Quantum Logic ◽  
Logic Gates ◽  
Direct Writing ◽  
Laser Direct Writing ◽  
Quantum Logic Gates

scholarly journals Femtosecond Laser Direct Writing of Integrated Photonic Quantum Chips for Generating Path-Encoded Bell States

Micromachines ◽  
2020 ◽  
Vol 11 (12) ◽  
pp. 1111
Author(s):  
Meng Li ◽  
Qian Zhang ◽  
Yang Chen ◽  
Xifeng Ren ◽  
Qihuang Gong ◽  
...  
Keyword(s):  
Femtosecond Laser ◽  
Quantum Computation ◽  
Logic Gates ◽  
Quantum Circuit ◽  
Bell States ◽  
Direct Writing ◽  
Laser Direct Writing ◽  
Quantum Logic Gates ◽  
Complex Circuits ◽  
Computation Algorithms

Integrated photonic quantum chip provides a promising platform to perform quantum computation, quantum simulation, quantum metrology and quantum communication. Femtosecond laser direct writing (FLDW) is a potential technique to fabricate various integrated photonic quantum chips in glass. Several quantum logic gates fabricated by FLDW have been reported, such as polarization and path encoded quantum controlled-NOT (CNOT) gates. By combining several single qubit gates and two qubit gates, the quantum circuit can realize different functions, such as generating quantum entangled states and performing quantum computation algorithms. Here we demonstrate the FLDW of integrated photonic quantum chips composed of one Hadamard gate and one CNOT gate for generating all four path-encoded Bell states. The experimental results show that the average fidelity of the reconstructed truth table reaches as high as 98.8 ± 0.3%. Our work is of great importance to be widely applied in many quantum circuits, therefore this technique would offer great potential to fabricate more complex circuits to realize more advanced functions.

Wavelength tunable fiber Bragg gratings fabricated by stress annealing assisted femtosecond laser direct writing

2021 ◽  
Vol 61 ◽  
pp. 102427
Author(s):  
Xiaoyan Sun ◽  
Zikun Chang ◽  
Li Zeng ◽  
Xinran Dong ◽  
Youwang Hu ◽  
...  
Keyword(s):  
Femtosecond Laser ◽  
Fiber Bragg Gratings ◽  
Bragg Gratings ◽  
Direct Writing ◽  
Laser Direct Writing ◽  
Wavelength Tunable

Micropatterned Cell‐Repellent Interface Using Femtosecond Laser Direct Writing to Engineer Controlled Cell Organization

2021 ◽  
pp. 2100178
Author(s):  
Wenguang Yang ◽  
Honghui Chu ◽  
Shuxiang Cai ◽  
Wenfeng Liang ◽  
Haibo Yu ◽  
...  
Keyword(s):  
Femtosecond Laser ◽  
Direct Writing ◽  
Laser Direct Writing ◽  
Cell Organization
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