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<p>Nano-structured optomechanical crystals (OMC) form an interface between mechanical modes with long coherence times and telecom optical photons, ideal for long-distance distribution of quantum information. However, the implementation of scalable quantum networks based on OMCs has been inhibited by thermal mechanical noise. Here, we overcome this limitation using a quasi-two-dimensional OMC and generate single photons via single phonon-photon conversion. In this work, we verify the low thermal noise and high purity of the generated single photons through a Hanbury Brown-Twiss experiment with <InlineEquation ID="IEq1"> <EquationSource Format="TEX">\({g}^{(2)}(0)=0.3{5}_{-0.08}^{+0.10}\)</EquationSource> <EquationSource Format="MATHML"><math> <msup> <mrow> <mi>g</mi> </mrow> <mrow> <mrow> <mo>(</mo> <mrow> <mn>2</mn> </mrow> <mo>)</mo> </mrow> </mrow> </msup> <mrow> <mo>(</mo> <mrow> <mn>0</mn> </mrow> <mo>)</mo> </mrow> <mo>=</mo> <mn>0.3</mn> <msubsup> <mrow> <mn>5</mn> </mrow> <mrow> <mo>−</mo> <mn>0.08</mn> </mrow> <mrow> <mo>+</mo> <mn>0.10</mn> </mrow> </msubsup> </math></EquationSource> </InlineEquation>. We perform Hong-Ou-Mandel interference of the emitted photons showcasing the indistinguishability and coherence with visibility <i>V</i>&#xa0;=&#xa0;0.52&#xa0;±&#xa0;0.15 after 1.43 km fiber delay. Lastly, we use two-photon interference to measure the temporal wavepackets of optomechanically generated single photons demonstrating narrow bandwidths as low as 10 MHz. Our results pave the way for multinode quantum networks of mechanical oscillators and hybrid entanglement generation between mechanical oscillators and telecom quantum emitters.</p>

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Low-noise optomechanical single phonon-photon conversion for quantum networks

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年1月5日

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  • Liu Chen,
  • Alexander Rolf Korsch,
  • Cauê Moreno Kersul,
  • Rodrigo Benevides,
  • Yong Yu,
  • Thiago P. Mayer Alegre,
  • Simon Gröblacher

摘要

Nano-structured optomechanical crystals (OMC) form an interface between mechanical modes with long coherence times and telecom optical photons, ideal for long-distance distribution of quantum information. However, the implementation of scalable quantum networks based on OMCs has been inhibited by thermal mechanical noise. Here, we overcome this limitation using a quasi-two-dimensional OMC and generate single photons via single phonon-photon conversion. In this work, we verify the low thermal noise and high purity of the generated single photons through a Hanbury Brown-Twiss experiment with \({g}^{(2)}(0)=0.3{5}_{-0.08}^{+0.10}\) g ( 2 ) ( 0 ) = 0.3 5 − 0.08 + 0.10 . We perform Hong-Ou-Mandel interference of the emitted photons showcasing the indistinguishability and coherence with visibility V = 0.52 ± 0.15 after 1.43 km fiber delay. Lastly, we use two-photon interference to measure the temporal wavepackets of optomechanically generated single photons demonstrating narrow bandwidths as low as 10 MHz. Our results pave the way for multinode quantum networks of mechanical oscillators and hybrid entanglement generation between mechanical oscillators and telecom quantum emitters.