We developed a pair of transportable optical lattice clocks and conducted an 18-digit-precision frequency comparison in a broadcasting tower to give a height difference of 450 m, which tested the gravitational redshift at 10-5 level.
© 2020 The Author(s)
You do not have subscription access to this journal. Citation lists with outbound citation links are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.
Contact your librarian or system administrator
Login to access OSA Member Subscription