Heralded non-destructive quantum entangling gate with single-photon sources
arXiv:2010.14788 · doi:10.1103/PhysRevLett.126.140501
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 ()%. As an application, we generated event-ready Bell states with a fidelity of ()%. Our results are an important step towards the development of photon-photon quantum logic gates.
arXiv commentmain text: 5 pages, 3 figures; supplement: 18 pages, 2 figure, 2 tables; comments are welcome!
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