Creating collective many-body states with highly excited atoms (2009)
Olmos, B., González-Férez, R., Lesanovsky, I.
We study the collective excitation of a gas of highly excited atoms confined to a large spacing ring lattice, where the ground and the excited states are coupled resonantly via a laser field. Our...
Fermionic collective excitations in a lattice gas of Rydberg atoms (2009)
Olmos, B., González-Férez, R., Lesanovsky, I.
We investigate the many-body quantum states of a laser-driven gas of Rydberg atoms confined to a large spacing ring lattice. If the laser driving is much stronger than the van-der-Waals interaction...
Localization in excitation number space of a strongly interacting Rydberg gas (2009)
Olmos, B., Müller, M., Lesanovsky, I.
When Rydberg states are excited in a dense atomic gas the mean number of excited atoms reaches a stationary value after an initial transient period. We shed light on the origin of this steady state...
Mesoscopic phases of dipolar ensembles with polar molecules and Rydberg atoms (2009)
Pupillo, G., Micheli, A., Boninsegni, M., Lesanovsky, I., Zoller, P.
We discuss the realization of mesoscopic phases of dipolar gases relevant to current experiments with cold polar molecules and Rydberg atoms confined to two dimensions. We predict the existence of...
Exploiting the composite character of Rydberg atoms for cold atom trapping (2009)
Mayle, M., Lesanovsky, I., Schmelcher, P.
By investigating the quantum properties of magnetically trapped nS Rydberg atoms, it is demonstrated that the composite nature of Rydberg atoms significantly alters their trapping properties opposed...
Collective Rydberg excitations of an atomic gas confined in a ring lattice (2008)
Olmos, B., González-Férez, R., Lesanovsky, I.
We study the excitation dynamics of Rydberg atoms in a one-dimensional lattice with periodic boundary conditions where the atomic Rydberg states are resonantly excited from the electronic ground...
Mesoscopic Rydberg Gate based on Electromagnetically Induced Transparency (2008)
Müller, M., Lesanovsky, I., Weimer, H., Büchler, H. P., Zoller, P.
We demonstrate theoretically a parallelized C-NOT gate which allows to entangle a mesoscopic ensemble of atoms with a single control atom in a single step, with high fidelity and on a microsecond...
Lesanovsky, I., Mueller, M., Zoller, P.
We study two ions confined in a Penning trap. We show that electronically highly excited states exist in which an electron is delocalized among the two ions forming a giant molecule of several...
Probing quantum and thermal noise in an interacting many-body system (2007)
Hofferberth, S., Lesanovsky, I., Schumm, T., Imambekov, A., Gritsev, V., Demler, E., ...
The probabilistic character of the measurement process is one of the most puzzling and fascinating aspects of quantum mechanics. In many-body systems quantum mechanical noise reveals non-local...
Trapped Rydberg Ions: From Spin Chains to Fast Quantum Gates (2007)
Mueller, M., Lesanovsky, I., Zoller, P.
We study the dynamics of Rydberg ions trapped in a linear Paul trap, and discuss the properties of ionic Rydberg states in the presence of the static and time-dependent electric fields constituting...
Non-equilibrium coherence dynamics in one-dimensional Bose gases (2007)
Hofferberth, S., Lesanovsky, I., Fischer, B., Schumm, T., Schmiedmayer, J.
Low-dimensional systems are beautiful examples of many-body quantum physics. For one-dimensional systems the Luttinger liquid approach provides insight into universal properties. Much is known of the...
Ultracold atoms in radio-frequency-dressed potentials beyond the rotating wave approximation (2006)
Hofferberth, S., Fischer, B., Schumm, T., Schmiedmayer, J., Lesanovsky, I.
We study dressed Bose-Einstein condensates in an atom chip radio-frequency trap. We show that in this system sufficiently strong dressing can be achieved to cause the widely used rotating wave...
Radio-frequency dressed state potentials for neutral atoms (2006)
Hofferberth, S., Lesanovsky, I., Fischer, B., Verdu, J., Schmiedmayer, J.
Potentials for atoms can be created by external fields acting on properties like magnetic moment, charge, polarizability, or by oscillating fields which couple internal states. The most prominent...
Manipulation of ultracold atoms in dressed adiabatic radio frequency potentials (2006)
Lesanovsky, I., Hofferberth, S., Schmiedmayer, J., Schmelcher, P.
We explore properties of atoms whose magnetic hyperfine sub-levels are coupled by an external magnetic radio frequency (rf) field. We perform a thorough theoretical analysis of this driven system and...
Sensing electric and magnetic fields with Bose-Einstein Condensates (2005)
Wildermuth, S., Hofferberth, S., Lesanovsky, I., Groth, S., Bar-Joseph, I., Krueger, P., ...
We discuss the application of Bose-Einstein condensates (BECs) as sensors for magnetic and electric fields. In an experimental demonstration we have brought one-dimensional BECs close to...
Adiabatic radio frequency potentials for the coherent manipulation of matter waves (2005)
Lesanovsky, I., Schumm, T., Hofferberth, S., Andersson, L. M., Krüger, P., Schmiedmayer, J.
Adiabatic dressed state potentials are created when magnetic sub-states of trapped atoms are coupled by a radio frequency field. We discuss their theoretical foundations and point out fundamental...
Rydberg Atoms in Magnetic Quadrupole Traps (2003)
Lesanovsky, I., Schmiedmayer, J., Schmelcher, P.
We investigate the electronic structure and properties of Rydberg atoms exposed to a magnetic quadrupole field. It is shown that the spatial as well as generalized time reversal symmetries lead to a...