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We study the transport in ultrathin disordered film near the quantum criticalpoint induced by the Zeeman field. We calculate corrections to the normal stateconductivity due to quantum pairing fluctuations. The fluctuation-inducedtransport is mediated by virtual rather than real quasi-particles. We find thatat zero temperature, where the corrections come from purely quantumfluctuations, the Aslamazov-Larkin paraconductivity term, the Maki-Thompsoninterference contribution and the density of states effects are all of the sameorder. The total correction leads to the negative magnetoresistance. Thisresult is in qualitative agreement with the recent transport observations inthe parallel magnetic field of the homogeneously disordered amorphous films andsuperconducting two-dimensional electron gas realized at the oxide interfaces.

Quantum-fluctuation effects in transport properties of superconductors above the paramagnetic limit