Tsai, Jaw-Shen

Superconducting Kerr Parametric Oscillators based Bosonic Qubit - A Practical Quantum Information Processing Platform

Jaw-Shen Tsai - Tokyo University of Science & RIKEN, Japan

Recently, there has been a renewed interest in using quantum tunneling in phase space of a Kerr parametric oscillator (KPO) as a resource for quantum information processing. In a planar superconducting KPO we observed quantum interference induced by such tunneling and its dynamics through Wigner tomography. A complete mapping from Fock states to cat states was demonstrated. We perform 1-bit X-gate and Z-gate operations [1] as well as 2-bit iSWAP quantum logic operation [2]. These results indicate that KPOs can be a scalable quantum information processing platform.

References:

1. Iyama, D., Kamiya, T., Fujii, S. et al. Observation and manipulation of quantum interference in a superconducting Kerr parametric oscillator. Nat Commun. 15, 86 (2024).

2. Daisuke Hoshi, Toshiaki Nagase, Sangil Kwon, et. al., Entangling Schrödinger’s cat states by bridging discrete- and continuous-variable encoding. Nature Commun. 16,1309 (2025)