Heralded non-destructive quantum entangling gate with single-photon sources

• URL: http://arxiv.org/abs/2010.14788v2
• Date: Sat, 16 Jan 2021 09:30:16 GMT
• Title: Heralded non-destructive quantum entangling gate with single-photon sources
• Authors: Jin-Peng Li, Xuemei Gu, Jian Qin, Dian Wu, Xiang You, Hui Wang, Christian Schneider, Sven H\"ofling, Yong-Heng Huo, Chao-Yang Lu, Nai-Le Liu, Li Li, Jian-Wei Pan
• Abstract summary: We demonstrate a heralded controlled-NOT (CNOT) operation between two single photons for the first time. Our results are an important step towards the development of photon-photon quantum logic gates.
• Score: 5.881327681338198
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• 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 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.

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