Servaas Kokkelmans (TUE) talk: Optically imprinted Rydberg lattices
Phys. Rev. Lett. 115, 043002 (2015)
Nat. Commun. 8, 15813 (2017)
There is a significant ongoing effort in realizing quantum annealing with different physical platforms. The challenge is to achieve a fully programmable quantum device featuring coherent adiabatic quantum dynamics. Here we show that combining the well-developed quantum simulation toolbox for Rydberg atoms with the recently proposed Lechner-Hauke-Zoller~(LHZ) architecture allows one to build a prototype for a coherent adiabatic quantum computer with all-to-all Ising interactions and, therefore, a novel platform for quantum annealing.
Quantum Sci. Technol. 2, 35006 (2017)
We present optimal control protocols to prepare different many-body quantum states of Rydberg atoms in optical lattices. Specifically, we show how to prepare highly ordered many-body ground states, GHZ states as well as some superposition of symmetric excitation number Fock states, that inherit the translational symmetry from the Hamiltonian, within sufficiently short excitation times minimizing detrimental decoherence effects.
PHYSICAL REVIEW A 96, 013425 (2017)
We use the sensitive response to electric fields of Rydberg atoms to characterize all three vector components of the local electric field close to an atom-chip surface. We measured Stark-Zeeman maps of S and D Rydberg states using an elongated cloud of ultracold Rubidium atoms (T ~2.5 µK) trapped magnetically 100 µm from the chip surface. The spectroscopy of S states yields a calibration for the generated local electric field at the position of the atoms.
Nature Physics (2017), doi:10.1038/nphys4058
arXiv:1612.05467v1
Quantum-state engineering is of critical importance to the development of quantum technologies. One promising platform is thermal atomic vapours, because they offer long coherence times with reproducible and scalable hardware. However, the inability to address isolated atomic states in a controlled manner, due to multi-level degeneracy and motional broadening, is a major obstacle to their wider application.
arXiv:1612.05529v1
We present an object-oriented Python library for computation of properties of highly-excited Rydberg states of alkali atoms.
PHYSICAL REVIEW A 94, 011401(R) (2016)
We investigate the nonequilibrium dynamics of a driven-dissipative spin ensemble with competing power-law interactions. We demonstrate that dynamical phase transitions as well as bistabilities can emerge for asymptotic van der Waals interactions, but critically rely on the presence of a slower decaying potential core.