Bell Correlations in Spin-Squeezed States of 500 000 Atoms

Squeezed light from spin-squeezed atoms.

We propose to transfer quantum correlations from atoms to light by Raman scattering of a strong laser pulse on a spin-squeezed atomic sample. We prove that the emission is restricted to a single field mode which perfectly inherits the quantum correlations of the atomic system.

Control of Squeezed Phonon and Spin States

In this paper we analyze the quantum control of squeezed states of harmonic oscillators as well as spin squeezing and its relationship to quadrature squeezed states of other bosonic fields. Squeezing provides a method for reducing noise below the quantum limit and provides an example of the control of under-actuated control systems in the stochastic and quantum context. We consider also the int...

Cholera count reaches 500 000 in Yemen

Visualization of correlations in intrashell triply excited states of atoms

The internal wave functions of the eight lowest intrashell triply excited states of Li atoms are analyzed. By visualizing the equidensity surfaces we show that in four of the eight states the most probable shape of the three electrons is a coplanar equilateral triangle with the nucleus at the center. The relative energies of these four states resemble the rotational spectrum of a symmetric top....

Dark Bell states in tunnel-coupled spin qubits

We investigate the dynamical purification of maximally entangled electron states by transport through coupled quantum dots. Under resonant ac driving and coherent tunneling, even-parity Bell states perform Rabi oscillations that decouple from the environment, leading to a dark state. The two electrons remain spatially separated, one in each quantum dot. We propose configurations where this effe...