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Heralded non-destructive quantum entangling gate with single-photon sources | | Jin-Peng Li
; Xuemei Gu
; Jian Qin
; Dian Wu
; Xiang You
; Hui Wang
; Christian Schneider
; Sven Höfling
; Yong-Heng Huo
; Chao-Yang Lu
; Nai-Le Liu
; Li Li
; Jian-Wei Pan
; | | Date: |
28 Oct 2020 | | Abstract: | Heralded entangling quantum gates are an essential element for the
implementation of large-scale quantum computation. Yet, the experimental
demonstration of genuine heralded entangling gates with free-flying output
photons in an all-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 semiconductor quantum
dots and pseudo photon-number-resolving detectors, 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 ($87.8pm1.2$)\%. As an application, we generated
event-ready Bell states with a fidelity of ($83.0pm2.4$)\%. Our results are an
important step towards the development of photon-photon quantum logic gates. | | Source: | arXiv, 2010.14788 | | Services: | Forum | Review | PDF | Favorites | |
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