On-chip photon-pair generation in a silica microtoroidal cavity

• DOI: 10.1364/oe.414037
• Publication Date: 2021-01-13T20:07:14Z
• Authors: Yosuke Hashimoto; Akihisa Goban; Yuki Hirabayashi; Yuta Kobayashi; Tomohiro Araki; Takao Aoki
• Keywords: Photon Counting

Microcavities with high Q factor and small mode volume have the potential to be efficient compact sources of photon pairs. Here, we demonstrate on-chip photon-pair generation by spontaneous four-wave mixing in a silica microtoroidal cavity obtain coincidence-to-accidental ratio 7.4 ± 0.1 pump power 46 µ W. The heralded photons also exhibit antibunching characterized autocorrelation function values <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"> <mml:msubsup> <mml:mi>g</mml:mi> <mml:mi>c</mml:mi> <mml:mrow class="MJX-TeXAtom-ORD"> <mml:mo stretchy="false">(</mml:mo> <mml:mn>2</mml:mn> stretchy="false">)</mml:mo> </mml:mrow> </mml:msubsup> <mml:mn>0</mml:mn> <mml:mo>=</mml:mo> <mml:mn>0.57</mml:mn> <mml:mo>±</mml:mo> <mml:mn>0.03</mml:mn> <mml:mo>&lt;</mml:mo> <mml:mn>1</mml:mn> </mml:math> . Comparing scaling model, main noise source is found Raman scattering cavity. This work opens new possible means for realizing integrated nonclassical based on photonic circuits toward scalable quantum technologies.