期刊
OPTICS EXPRESS
卷 29, 期 5, 页码 6991-7002出版社
OPTICAL SOC AMER
DOI: 10.1364/OE.416843
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资金
- Engineering and Physical Sciences Research Council [EP/L015110/1, EP/N002962/1, EP/T001011/1]
- EPSRC [EP/N002962/1] Funding Source: UKRI
An ideal photon-pair source for building multi-qubit states should produce indistinguishable photons with high efficiency. Using domain engineering in parametric down-conversion sources, one can achieve high two-photon interference visibilities without the need for lossy spectral filtering. This leads to high net heralding efficiencies and collection efficiencies above 90%.
The ideal photon-pair source for building up multi-qubit states needs to produce indistinguishable photons with high efficiency. Indistinguishability is crucial for minimising errors in two-photon interference, central to building larger states, while high heralding rates will be needed to overcome unfavourable loss scaling. Domain engineering in parametric down-conversion sources negates the need for lossy spectral filtering allowing one to satisfy these conditions inherently within the source design. Here, we present a telecom-wavelength parametric down-conversion photon source that operates on the achievable limit of domain engineering. We generate photons from independent sources which achieve two-photon interference visibilities of up to 98.6 +/- 1.1% without narrow-band filtering. As a consequence, we reach net heralding efficiencies of up to 67.5%, which corresponds to collection efficiencies exceeding 90%. Published by The Optical Society under the terms of the Creative Commons Attribution 4.0 License.
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