Quantum simulation of molecular vibronic spectra on a superconducting bosonic processor

  1. Christopher S. Wang,
  2. Jacob C. Curtis,
  3. Brian J. Lester,
  4. Yaxing Zhang,
  5. Yvonne Y. Gao,
  6. Jessica Freeze,
  7. Victor S. Batista,
  8. Patrick H. Vaccaro,
  9. Isaac L. Chuang,
  10. Luigi Frunzio,
  11. Liang Jiang,
  12. S. M. Girvin,
  13. and Robert J. Schoelkopf
The efficient simulation of quantum systems is a primary motivating factor for developing controllable quantum machines. A controllable bosonic machine is naturally suited for simulating systems with underlying bosonic structure, exploiting both quantum interference and an intrinsically large Hilbert space. Here, we experimentally realize a bosonic superconducting processor that combines arbitrary state preparation, a complete set of Gaussian operations, plus an essential non-Gaussian resource – a novel single-shot photon number resolving measurement scheme – all in one device. We utilize these controls to simulate the bosonic problem of molecular vibronic spectra, extracting the corresponding Franck-Condon factors for photoelectron processes in H2O, O3, NO2, and SO2. Our results demonstrate the versatile capabilities of the circuit QED platform, which can be extended to include non-Gaussian operations for simulating an even wider class of bosonic systems.
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