Heralded Nondestructive Quantum Entangling Gate with Single-Photon Sources
| Autor: | Nai-Le Liu, Li Li, Chao-Yang Lu, Jian Qin, Hui Wang, Yongheng Huo, Dian Wu, Xuemei Gu, Christian Schneider, Jin-Peng Li, Jian-Wei Pan, Sven Höfling, Xiang You |
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| Rok vydání: | 2021 |
| Předmět: |
Physics
Quantum Physics Bell state Photon FOS: Physical sciences General Physics and Astronomy 01 natural sciences Quantum logic Computer Science::Emerging Technologies Quantum gate Semiconductor quantum dots Controlled NOT gate Quantum mechanics 0103 physical sciences Quantum Physics (quant-ph) 010306 general physics Quantum Quantum computer |
| Zdroj: | Physical Review Letters. 126 |
| ISSN: | 1079-7114 0031-9007 |
| Popis: | 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 micro-pillar 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 ($87.8\pm1.2$)%. As an application, we generated event-ready Bell states with a fidelity of ($83.4\pm2.4$)%. Our results are an important step towards the development of photon-photon quantum logic gates. main text: 5 pages, 3 figures; supplement: 18 pages, 2 figure, 2 tables; comments are welcome! |
| Databáze: | OpenAIRE |
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