High-fidelity photonic quantum logic gate based on near-optimal Rydberg single-photon source

Shuai Shi, Biao Xu, Kuan Zhang, Gen-Sheng Ye, Xiang De-Sheng, Yubao Liu, Jingzhi Wang, Daiqin Su () and Lin Li ()
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Shuai Shi: Huazhong University of Science and Technology
Biao Xu: Huazhong University of Science and Technology
Kuan Zhang: Huazhong University of Science and Technology
Gen-Sheng Ye: Huazhong University of Science and Technology
Xiang De-Sheng: Huazhong University of Science and Technology
Yubao Liu: Huazhong University of Science and Technology
Jingzhi Wang: Huazhong University of Science and Technology
Daiqin Su: Huazhong University of Science and Technology
Lin Li: Huazhong University of Science and Technology

Nature Communications, 2022, vol. 13, issue 1, 1-6

Abstract: Abstract Compared to other types of qubits, photon is one of a kind due to its unparalleled advantages in long-distance quantum information exchange. Therefore, photon is a natural candidate for building a large-scale, modular optical quantum computer operating at room temperature. However, low-fidelity two-photon quantum logic gates and their probabilistic nature result in a large resource overhead for fault tolerant quantum computation. While the probabilistic problem can, in principle, be solved by employing multiplexing and error correction, the fidelity of linear-optical quantum logic gate is limited by the imperfections of single photons. Here, we report the demonstration of a linear-optical quantum logic gate with truth table fidelity of 99.84(3)% and entangling gate fidelity of 99.69(4)% post-selected upon the detection of photons. The achieved high gate fidelities are made possible by our near-optimal Rydberg single-photon source. Our work paves the way for scalable photonic quantum applications based on near-optimal single-photon qubits and photon-photon gates.

Date: 2022
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DOI: 10.1038/s41467-022-32083-9

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