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<p>Mechanical systems have emerged as a compelling platform for applications in quantum information, leveraging advances in the control of phonons, the quanta of mechanical vibrations. Experiments have demonstrated the control and measurement of phonon states in mechanical resonators, and while dual-resonator entanglement has been demonstrated, more complex entangled states remain a challenge. Here, we demonstrate rapid multi-phonon entanglement generation and subsequent tomographic analysis, using a scalable platform comprising two surface acoustic wave resonators on separate substrates, each connected to a superconducting qubit. We synthesize a mechanical Bell state with a fidelity of <InlineEquation ID="IEq1"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="41467_2025_56454_Article_IEq1.gif" Format="GIF" Height="15" Rendition="HTML" Resolution="72" Type="Linedraw" Width="131" /> </InlineMediaObject> <EquationSource Format="TEX">\({{{{\mathcal{F}}}}}=0.872\pm 0.002\)</EquationSource> <EquationSource Format="MATHML"><math> <mi class="MJX-tex-caligraphic" mathvariant="script">F</mi> <mo>=</mo> <mn>0.872</mn> <mo>±</mo> <mn>0.002</mn> </math></EquationSource> </InlineEquation>, and a multi-phonon entangled <i>N</i> = 2 N00N state with a fidelity of <InlineEquation ID="IEq2"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="41467_2025_56454_Article_IEq2.gif" Format="GIF" Height="15" Rendition="HTML" Resolution="72" Type="Linedraw" Width="131" /> </InlineMediaObject> <EquationSource Format="TEX">\({{{{\mathcal{F}}}}}=0.748\pm 0.008\)</EquationSource> <EquationSource Format="MATHML"><math> <mi class="MJX-tex-caligraphic" mathvariant="script">F</mi> <mo>=</mo> <mn>0.748</mn> <mo>±</mo> <mn>0.008</mn> </math></EquationSource> </InlineEquation>. The compact, modular, and scalable platform we demonstrate will enable further advances in the quantum control of complex mechanical systems.</p>

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Deterministic multi-phonon entanglement between two mechanical resonators on separate substrates

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年2月7日

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  • Ming-Han Chou,
  • Hong Qiao,
  • Haoxiong Yan,
  • Gustav Andersson,
  • Christopher R. Conner,
  • Joel Grebel,
  • Yash J. Joshi,
  • Jacob M. Miller,
  • Rhys G. Povey,
  • Xuntao Wu,
  • Andrew N. Cleland

摘要

Mechanical systems have emerged as a compelling platform for applications in quantum information, leveraging advances in the control of phonons, the quanta of mechanical vibrations. Experiments have demonstrated the control and measurement of phonon states in mechanical resonators, and while dual-resonator entanglement has been demonstrated, more complex entangled states remain a challenge. Here, we demonstrate rapid multi-phonon entanglement generation and subsequent tomographic analysis, using a scalable platform comprising two surface acoustic wave resonators on separate substrates, each connected to a superconducting qubit. We synthesize a mechanical Bell state with a fidelity of \({{{{\mathcal{F}}}}}=0.872\pm 0.002\) F = 0.872 ± 0.002 , and a multi-phonon entangled N = 2 N00N state with a fidelity of \({{{{\mathcal{F}}}}}=0.748\pm 0.008\) F = 0.748 ± 0.008 . The compact, modular, and scalable platform we demonstrate will enable further advances in the quantum control of complex mechanical systems.