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Vacuum ultraviolet light sensitive photomultiplier tubes directly coupled toliquid xenon are being used to efficiently detect the 178 nm scintillationlight in a variety of liquid xenon based particle detectors. Good knowledge ofthe performance of these photomultipliers under cryogenic conditions is neededto properly characterize these detectors. Here, we report on measurements ofthe quantum efficiency of Hamamatsu R8520 photomultipliers, used in the XENONDark Matter Experiments. The quantum efficiency measurements at roomtemperature agree with the values provided by Hamamatsu. At low temperatures,between 160K and 170K, the quantum efficiency increases by $\sim5-11$% relativeto the room temperature values.

Measurement of the Quantum Efficiency of Hamamatsu R8520 Photomultipliers at Liquid Xenon Temperature