  Quantum directed transport can be realized in non-interacting, deterministic,
chaotic systems by appropriately breaking the spatio-temporal symmetries in the
potential. In this work, the focus is on the class of interacting quantum
systems whose classical limit is chaotic. In this limit, one subsystem
effectively acts as a source of "noise" to the other leading to temporal
symmetry breaking. Thus, the quantum directed currents can be generated with
two ingredients -- broken spatial symmetry in the potential and presence of
interactions. This is demonstrated in two-body interacting kicked rotor and
kicked Harper models. Unlike earlier schemes employed for single-particle
ratchet currents, this work provides a minimal framework for realizing quantum
directed transport in interacting systems. This can be generalized to many-body
quantum chaotic systems.
