Funding for this research was provided by:
Sumitomo Foundation (170431)
High Energy Accelerator Research Organization (Fiscal 2017 grant for quantum beam science)
Japan Society for the Promotion of Science (18K13630, 18H05224)
Received: 30 March 2021
Accepted: 27 May 2021
First Online: 24 June 2021
: The authors declare no competing interests.