quantum physics

$Proposed experimental setup for simulating quantum spin models in atomic ensembles confined in a microtrap array. Two spin states $| \,\downarrow \,\rangle $ and $| \,\uparrow \,\rangle $ are encoded in a single two-step excitation to the Rydberg state $| {n}_{\downarrow }S\rangle $ or $| {n}_{\uparrow }S\rangle $, shared amongst all atoms in an ensemble. The spatial extent of each ensemble is ℓ, the on-site blockade radius is rc and the lattice spacing is a, with $a\gtrsim {r}_{c}\gg {\ell }$. The inset shows the internal level structure of a single atom with the states involved in the detection processes marked with dashed lines. General spin–spin interactions occur via long-range van der Waals interactions between the $| {n}_{\downarrow }S\rangle $ and $| {n}_{\uparrow }S\rangle $ states.$

Image of the Week: simulating quantum spin models in microtraps

By Thomas Farrell on April 18, 2017

A new way of simulating lattice spin models using ultracold Rydberg atoms

$Equilateral ${{\rm{H}}}_{3}^{+}$ molecular ion (dark green balls) and counter-rotating bicircular $\omega /2\omega $ laser field$

Happy new year from Journal of Physics B: Atomic, Molecular and Optical Physics!

By Isabelle Auffret-Babak on January 13, 2017

Reflecting on JPhysB’s performance in 2016, before starting the golden jubilee’s festivities

Image of the Week: Multi-lobe probability density function

By Phil Brown on January 10, 2017

Today’s Image of the Week comes from a study of The difference between two random mixed quantum states: exact and asymptotic spectral analysis from the Universidad de los Andes and ETH Zürich. In this recent JPhysA paper, José Mejía, Camilo… Read More ›

Image of the Week: Kagomé ice hardcore bosons.

By Phil Brown on November 21, 2016

Today’s Image of the Week comes from a study of Ground state properties of quantum kagomé ice hardcore bosons from the Perimeter Institute and the African Institute for Mathematical Sciences. In his recent JPhysA paper, Solomon Owerre estimates the zero-temperature… Read More ›