Quantum Statistics of the Squeezed Vacuum by Measurement of the Density Matrix in the Number State Representation
Stephan Schiller, G. Breitenbach, S. F. Pereira, T. Müller, J. Mlynek · Physical Review Letters · 1996
We report the reconstruction of the quantum state of squeezed vacuum generated by a continuous-wave optical parametric amplifier. Homodyne detection and tomographic reconstruction methods were used to obtain the density matrix in the Fock (number state) representation. The photon number distribution exhibits odd-even oscillations, a manifestation of the photon pair production in the second-order nonlinear medium.