  We report our realization of a parity-time (PT) symmetric non-Hermitian
many-body system using cold atoms with dissipation. After developing a
theoretical framework on PT-symmetric many-body systems using ultracold atoms
in an optical lattice with controlled dissipation, we describe our experimental
setup utilizing one-body atom loss as dissipation with special emphasis on
calibration of important system parameters. We discuss loss dynamics observed
experimentally.
