Endoscopic tomography and quantum nondemolition
Mauro Fortunato, Paolo Tombesi, Wolfgang P. Schleich · Physical Review A · 1999
We propose to measure the quantum state of a single mode of the radiation field in a cavity---the signal field---by coupling it via a quantum-non-demolition Hamiltonian to a meter field in a highly squeezed state. We show that quantum-state tomography on the meter field using balanced homodyne detection provides full information about the signal state. We discuss the influence of measurement of the meter on the signal field.