Observation and manipulation of quantum interference in a superconducting Kerr parametric oscillator

Daisuke Iyama, Takahiko Kamiya, Shiori Fujii, Hiroto Mukai, Yu Zhou, Toshiaki Nagase, Akiyoshi Tomonaga, Rui Wang, Jiao-Jiao Xue, Shohei Watabe, Sangil Kwon () and Jaw-Shen Tsai
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Daisuke Iyama: Tokyo University of Science
Takahiko Kamiya: Tokyo University of Science
Shiori Fujii: Tokyo University of Science
Hiroto Mukai: RIKEN Center for Quantum Computing (RQC)
Yu Zhou: RIKEN Center for Quantum Computing (RQC)
Toshiaki Nagase: Tokyo University of Science
Akiyoshi Tomonaga: RIKEN Center for Quantum Computing (RQC)
Rui Wang: RIKEN Center for Quantum Computing (RQC)
Jiao-Jiao Xue: RIKEN Center for Quantum Computing (RQC)
Shohei Watabe: Shibaura Institute of Technology
Sangil Kwon: Tokyo University of Science
Jaw-Shen Tsai: RIKEN Center for Quantum Computing (RQC)

Nature Communications, 2024, vol. 15, issue 1, 1-10

Abstract: Abstract 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 and its dynamics in a planar superconducting circuit through Wigner tomography. We experimentally elucidate all essential properties of this quantum interference, such as mapping from Fock states to cat states, a temporal oscillation due to 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 superconducting Kerr parametric oscillators and their use in quantum information technologies.

Date: 2024
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DOI: 10.1038/s41467-023-44496-1

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