We generate intensity-difference-squeezed Laguerre-Gauss twin beams of light carrying orbital angular momentum by using four-wave mixing in a hot atomic vapor. The conservation of orbital angularâ€¦ (More)

We have observed a violation of the Cauchy-Schwarz inequality in the macroscopic regime by more than 8 standard deviations. The violation has been obtained while filtering out only the low-frequencyâ€¦ (More)

2008 Conference on Lasers and Electro-Optics andâ€¦

2008

We show that non-degenerate 4-wave mixing in an atomic vapor can produce highly multimode twin beams. The process can be used to generate arbitrarily-shaped continuous-variable entangled twin beamsâ€¦ (More)

2009 Conference on Lasers and Electro-Optics andâ€¦

2009

We show that non-degenerate four-wave mixing in an atomic vapor can be used as a quantum delay line for multi-spatial-mode twin beams. This makes it possible to delay continuous variable entangledâ€¦ (More)

2009 Conference on Lasers and Electro-Optics andâ€¦

2009

We present a universal optical amplifier performing near the quantum limit using a four-wave mixing nonlinear interaction. We show that one mode from a bipartite entangled state can be amplified andâ€¦ (More)

We experimentally study the effect of atomic diffusion on the quality of an image stored in the long-lived ground state coherence of a warm atomic ensemble using a gradient echo memory.