List of Division publications with links

2011-01-17 10:25 - Entangling different degrees of freedom by quadrature squeezing cylindrically polarized modes

C. Gabriel, A. Aiello, W. Zhong, T. G. Euser, N.Y. Joly, P. Banzer, M. Fortsch, D. Elser, U. L. Andersen, Ch. Marquardt, P. St.J. Russell, and G. Leuchs, Phys. Rev. Lett. 106, 060502 (2011).

Quantum systems as, for example, photons, atoms or Bose-Einstein condensates, prepared in complex states where entanglement between distinct degrees of freedom is present, may display several intriguing features. In this work we introduce the concept of such complex quantum states for intense beams of light by exploiting the properties of cylindrically polarized modes. We show that already in a classical picture the spatial and polarization field variables of such cylindrically polarized modes cannot be factorized. Theoretically it is proven that by quadrature squeezing one of these modes one generates entanglement between these two different degrees of freedom. Experimentally we demonstrate amplitude squeezing of an azimuthally polarized mode by exploiting the non-linear Kerr effect in a specially tailored photonic crystal fiber which supports these cylindrically polarized modes. These results display that such novel continuous variable entangled systems can in principle be realized.