  Nonlinear transport is a unique functionality of noncentrosymmetric systems,
which reflects profound physics, such as spin-orbit interaction,
superconductivity and band geometry. However, it remains highly challenging to
enhance the nonreciprocal transport for promising rectification devices. Here,
we observe a light-induced giant enhancement of nonreciprocal transport at the
superconducting and epitaxial CaZrO3/KTaO3 (111) interfaces. The nonreciprocal
transport coefficient undergoes a giant increase with three orders of magnitude
up to 105 A-1T-1. Furthermore, a strong Rashba spin-orbit coupling effective
field of 14.7 T is achieved with abundant high-mobility photocarriers under
ultraviolet illumination, which accounts for the giant enhancement of
nonreciprocal transport coefficient. Our first-principles calculations further
disclose the stronger Rashba spin-orbit coupling strength and the longer
relaxation time in the photocarrier excitation process, bridging the
light-property quantitative relationship. Our work provides an alternative
pathway to boost nonreciprocal transport in noncentrosymmetric systems and
facilitates the promising applications in opto-rectification devices and
spin-orbitronic devices.
