Ujitoko, Yusuke
Kawabe, Takahiro
Article History
Received: 29 October 2021
Accepted: 19 January 2022
First Online: 2 February 2022
Competing interests
: Y.U and T.K are employees of NTT Communication Science Laboratories, which is a basic-science research section of Nippon Telegraph and Telecommunication corporation (NTT). There is a pending patent involving the reported research. There are no products in development or marketed products to declare. The pending patent does not alter the author’s adherence to policies of Scientific Reports.