1. Heralded Nondestructive Quantum Entangling Gate with Single-Photon Sources.
- Author
-
Jin-Peng Li, Xuemei Gu, Jian Qin, Dian Wu, Xiang You, Hui Wang, Schneider, Christian, Höfling, Sven, Yong-Heng Huo, Chao-Yang Lu, Nai-Le Liu, Li Li, and Jian-Wei Pan
- Subjects
- *
QUANTUM gates , *PHOTON pairs , *QUANTUM logic , *QUANTUM computing , *PARAMETRIC downconversion , *SEMICONDUCTOR quantum dots , *LOGIC circuits - Abstract
Heralded entangling quantum gates are an essential element for the implementation of large-scale optical quantum computation. Yet, the experimental demonstration of genuine heralded entangling gates with free-flying output photons in linear optical system, was hindered by the intrinsically probabilistic source and double-pair emission in parametric down-conversion. Here, by using an on-demand single-photon source based on a semiconductor quantum dot embedded in a micropillar cavity, we demonstrate a heralded controlled-NOT (CNOT) operation between two single photons for the first time. To characterize the performance of the CNOT gate, we estimate its average quantum gate fidelity of (87.8±1.2)%. As an application, we generated event-ready Bell states with a fidelity of (83.4±2.4)%. Our results are an important step towards the development of photon-photon quantum logic gates. [ABSTRACT FROM AUTHOR]
- Published
- 2021
- Full Text
- View/download PDF