Sihao Wang

10-GHz superconducting cavity piezo-optomechanics for microwave-optical photon conversion

  1. Xu Han,
  2. Wei Fu,
  3. Changchun Zhong,
  4. Chang-Ling Zou,
  5. Yuntao Xu,
  6. Ayed Al Sayem,
  7. Mingrui Xu,
  8. Sihao Wang,
  9. Risheng Cheng,
  10. Liang Jiang,
  11. and Hong X. Tang
Coherent photon conversion between microwave and optics holds promise for the realization of distributed quantum networks, in particular, the architecture that incorporates superconducting
quantum processors with optical telecommunication channels. High-frequency gigahertz piezo-mechanics featuring low thermal excitations offers an ideal platform to mediate microwave-optical coupling. However, integrating nanophotonic and superconducting circuits at cryogenic temperatures to simultaneously achieve strong photon-phonon interactions remains a tremendous challenge. Here, we report the first demonstration of an integrated superconducting cavity piezo-optomechanical converter where 10-GHz phonons are resonantly coupled with photons in a superconducting microwave and a nanophotonic cavities at the same time. Benefited from the cavity-enhanced interactions, efficient bidirectional microwave-optical photon conversion is realized with an on-chip efficiency of 0.07% and an internal efficiency of 5.8%. The demonstrated superconducting piezo-optomechanical interface makes a substantial step towards quantum communication at large scale, as well as novel explorations in hybrid quantum systems such as microwave-optical photon entanglement and quantum sensing.
arxiv pdf

Superconducting cavity electro-optics: a platform for coherent photon conversion between superconducting and photonic circuits

  1. Linran Fan,
  2. Chang-Ling Zou,
  3. Risheng Cheng,
  4. Xiang Guo,
  5. Xu Han,
  6. Zheng Gong,
  7. Sihao Wang,
  8. and Hong X. Tang
Leveraging the quantum information processing ability of superconducting circuits and long-distance distribution ability of optical photons promises the realization of complex and large-scale
quantum networks. In such a scheme, a coherent and efficient quantum transducer between superconducting and photonic circuits is critical. However, such quantum transducer is still challenging since the use of intermediate excitations in current schemes introduces extra noise and limits bandwidth. Here we realize direct and coherent transduction between superconducting and photonic circuits based on triple-resonance electro-optics principle, with integrated devices incorporating both superconducting and optical cavities on the same chip. Electromagnetically induced transparency is observed, indicating the coherent interaction between microwave and optical photons. Internal conversion efficiency of 25.9\pm0.3\% has been achieved, with 2.05\pm0.04\% total efficiency. Superconducting cavity electro-optics offers broad transduction bandwidth and high scalability, and represents a significant step towards the integrated hybrid quantum circuits and distributed quantum computation.
arxiv pdf