Non-Hermitian topological photonics is of great interest in bridging
topological matter with gain/dissipation engineering in optics. A key problem
in this direction is the interplay between the effective gauge potential and
the non-Hermiticity. Here we tackle this problem in a synthetic non-Hermitian
Hall ladder and experimentally observe antichiral edge currents (ACECs) of
photons, by tuning the locally uniform effective magnetic flux and the on-site
gain/loss. Such ACECs provide a topological method to probe the signatures of
the non-Hermitian skin effect (NHSE) from steady-state bulk dynamics. The
universality of this method is verified by its generalization to three
dimensions. This study paves a way to investigate exotic non-Hermitian
topological physics and has potential applications in topological photonics
engineering