Quantum-state tomography of two-mode light using generalized rotations in phase space - art. no. 015801

We introduce a method for quantum-state tomography for a pair of optical mo des, which we call generalized rotations in phase space. Rather than using a dual-mode local oscillator field for implementing balanced-homodyne detec tion, as in previous methods, a single-mode local oscillator field can be u sed in our method, greatly simplifying certain aspects of experiments. The signal field is put through a series of general transformations before ente ring the detection system where quantum statistics are measured.