We suggest and experimentally demonstrate a tomographic method to characterize homodyne detectors at the quantum level. Our results have just appeared in New Journal of Physics.
Balanced homodyne detection is a crucial detection technique for continuous variable quantum technology and lies at the core of many experiments in fundamental quantum optics. However, a reliable and robust model for the description of the fully phase-sensitive homodyne detection in the form of a quantum detector tomography (QDT) is still lacking.
In this work we present a theoretical and experimental realization of QDT for homodyne detectors, whose operators are naturally described in phase space.