Ultrafast non-destructive measurement of the quantum state of light with free electrons

We demonstrate that free electrons can be used as ultrafast non-destructive photon detectors. Particularly, we show how one can measure photon statistics, temporal coherence, and implement full quantum state tomography using free electrons.

Automated summary

Free electrons can be utilized as ultrafast non-destructive photon detectors to measure photon statistics, temporal coherence, and conduct full quantum state tomography.