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Microwave squeezing represents the ultimate sensitivity frontier forsuperconducting qubit measurement. However, observation of enhancement hasremained elusive, in part because integration with conventional dispersivereadout pollutes the signal channel with antisqueezed vacuum. Here we induce astroboscopic light-matter coupling with superior squeezing compatibility, andobserve an increase in the room-temperature signal-to-noise ratio of 24%.Squeezing the orthogonal phase controls measurement backaction, slowingdephasing by a factor of 1.8. This protocol enables the practical use ofmicrowave squeezing for qubit state measurement.

Stroboscopic qubit measurement with squeezed illumination