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arXiv · 2105.10631

Universal quantum multi-qubit entangling gates with auxiliary spaces

Wen-Qiang Liu·Hai-Rui Wei·Leong-Chuan Kwek
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Abstract

Universal quantum entangling gates are a crucial building block in the large-scale quantum computation and quantum communication, and it is an important task to find simple ways to implement them. Here an effective quantum circuit for the implementation of a controlled-NOT (CNOT) gate is constructed by introducing a non-computational quantum state in the auxiliary space. Furthermore, the method is extended to the construction of a general n-control-qubit Toffoli gate with (2n-1) qubit-qudit gates and (2n-2) single-qudit gates. Based on the presented quantum circuits, the polarization CNOT and Toffoli gates with linear optics are designed by operating on the spatial-mode degree of freedom of photons. The proposed optical schemes can be achieved with a higher success probability and no extra auxiliary photons are needed.

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Wen-Qiang Liu, Hai-Rui Wei, Leong-Chuan Kwek. 2021-05-22. Universal quantum multi-qubit entangling gates with auxiliary spaces. https://doi.org/10.1002/qute.202100136

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