Revealing hidden entanglement in the covariance matrix
F. A. S. Barbosa, A. S. Coelho, K. N. Cassemiro, P. Nussenzveig, M. Martinelli, Claude Fabre, Alessandro S. Villar · Latin America Optics and Photonics Conference · 2012
Interferometric techniques, combined with electronic signal processing, have provided powerful tools for the precise reconstruction of quantum states of the field. Nevertheless, in most cases the completeness of the measurement relies in strong assumptions about its symmetry. In the present work, I will show how the use of optical cavities as a tool for state reconstruction can provide a complete description of the state, relaxing a priori assumptions and revealing a broad distribution of entanglement among sidebands of different optical beams, as in the case of those generated by an optical parametric oscillator.