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A chip-scale single-photon SWAP gate as integrated interface between polarization and spatial-momentum qubits

Xie, Zhenda
Li, Yongnan
Xu, Xinan
Kumar, Abhinav
Kocaman, Serdar
Zhong, Tian
Veitia, Andrzej
Yu, Mingbin
Kwong, Dim-Lee
Wong, Franco N. C.
Wong, Chee Wei
We demonstrate a single-photon SWAP gate between polarization and spatial momentum on a SOI chip. 19.8% error ratio is obtained, and phase coherence of the SWAP operation is measured via single photon interference with up to 58.7% visibility.