Observation and manipulation of quantum interference in a Kerr parametric oscillator

  1. Daisuke Iyama,
  2. Takahiko Kamiya,
  3. Shiori Fujii,
  4. Hiroto Mukai,
  5. Yu Zhou,
  6. Toshiaki Nagase,
  7. Akiyoshi Tomonaga,
  8. Rui Wang,
  9. Jiao-Jiao Xue,
  10. Shohei Watabe,
  11. Sangil Kwon,
  12. and Jaw-Shen Tsai
Quantum tunneling is the phenomenon that makes superconducting circuits „quantum“. Recently, there has been a renewed interest in using quantum tunneling in phase space of a Kerr parametric oscillator as a resource for quantum information processing. Here, we report a direct observation of quantum interference induced by such tunneling in a planar superconducting circuit. We experimentally elucidate all essential properties of this quantum interference, such as mapping from Fock states to cat states, a temporal oscillation induced by the pump detuning, as well as its characteristic Rabi oscillations and Ramsey fringes. Finally, we perform gate operations as manipulations of the observed quantum interference. Our findings lay the groundwork for further studies on quantum properties of Kerr parametric oscillators and their use in quantum information technologies.
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