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The energy resolution of a single photon counting Microwave KineticInductance Detector (MKID) can be degraded by noise coming from the primary lowtemperature amplifier in the detector's readout system. Until recently, quantumlimited amplifiers have been incompatible with these detectors due to dynamicrange, power, and bandwidth constraints. However, we show that a kineticinductance based traveling wave parametric amplifier can be used for thisapplication and reaches the quantum limit. The total system noise for thisreadout scheme was equal to ~2.1 in units of quanta. For incident photons inthe 800 to 1300 nm range, the amplifier increased the average resolving powerof the detector from ~6.7 to 9.3 at which point the resolution becomes limitedby noise on the pulse height of the signal. Noise measurements suggest that aresolving power of up to 25 is possible if redesigned detectors can remove thisadditional noise source.

Wide-band Parametric Amplifier Readout and Resolution of Optical Microwave Kinetic Inductance Detectors