Related papers: Experimental Demonstration of a Quantum Controlled-SWAP Gate with Multiple Degrees of Freedom of a Single Photon

Experimental Demonstration of a Quantum Controlled-SWAP Gate with Multiple Degrees of Freedom of a Single Photon

URL: http://arxiv.org/abs/2011.02581v3
Date: Tue, 20 Apr 2021 01:14:51 GMT
Title: Experimental Demonstration of a Quantum Controlled-SWAP Gate with Multiple Degrees of Freedom of a Single Photon
Authors: Feiran Wang, Shihao Ru, Yunlong Wang, Min An, Pei Zhang, and Fuli Li
Abstract summary: We propose and experimentally implement quantum Fredkin gate in a single-photon hybrid-degrees-of-freedom system. We find that a kind of Greenberger-Horne-Zeilinger-like states can be prepared by using our quantum Fredkin gate.
Score: 4.121840022679671
License: http://creativecommons.org/licenses/by-nc-nd/4.0/
Abstract: Optimizing the physical realization of quantum gates is important to build a quantum computer. The controlled-SWAP gate, also named Fredkin gate, can be widely applicable in various quantum information processing schemes. In the present research, we propose and experimentally implement quantum Fredkin gate in a single-photon hybrid-degrees-of-freedom system. Polarization is used as the control qubit, and SWAP operation is achieved in a four-dimensional Hilbert space spanned by photonic orbital angular momentum. The effective conversion rate $\mathcal{P}$ of the quantum Fredkin gate in our experiment is $(95.4\pm 2.6)\%$. Besides, we find that a kind of Greenberger-Horne-Zeilinger-like states can be prepared by using our quantum Fredkin gate, and these nonseparale states can show its quantum contextual characteristic by the violation of Mermin inequality. Our experimental design and coding method are useful for quantum computing and quantum fundamental study in high-dimensional and hybrid coding quantum systems.

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