We experimentally investigate the action of a localized dissipative potential on macroscopic matter wave, which we implement by shining an electron beam atomic Bose-Einstein condensate (BEC). measure losses induced as function dissipation strength observing paradoxical behavior when exceeds critical limit: for increase rate number atoms lost from BEC becomes lower. repeat experiment different parameters and compare our results with simple theoretical model, finding excellent agreement. By...

We experimentally study a driven-dissipative Josephson junction array, realized with weakly interacting Bose Einstein condensate residing in one-dimensional optical lattice. Engineered losses on one site act as local dissipative process, while tunneling from the neighboring sites constitutes driving force. characterize emerging steady-states of this atomtronic device. With increasing dissipation strength $\gamma$ system crosses superfluid state, characterized by coherent current into lossy...

Bose-Einstein condensation has been achieved in a magnetic surface microtrap with 4 x 10(5) (87)Rb atoms. The strongly anisotropic trapping potential is generated by microstructure which consists of microfabricated linear copper conductor widths ranging from 3 to 30 microm. After loading high number atoms pulsed thermal source directly into magneto-optical trap the magnetically stored are transferred adiabatic transformation potential. In cooled using forced rf-evaporation. complete vacuo...

We realize an interferometer with atomic Fermi gas trapped in optical lattice under the influence of gravity. The single-particle interference between eigenstates results macroscopic Bloch oscillations sample. absence interactions fermions allows a time-resolved study many periods oscillations, leading to sensitive determination acceleration experiment proves superiority noninteracting respect bosons for precision interferometry and offers way measurement forces microscopic spatial resolution.

We demonstrate single-site addressability in a two-dimensional optical lattice with 600 nm spacing. After loading Bose-Einstein condensate the potential, we use focused electron beam to remove atoms from selected sites. The patterned structure is subsequently imaged by means of scanning microscopy. This technique allows one create arbitrary patterns mesoscopic atomic ensembles. find that are remarkably stable against tunneling diffusion. Such microengineered quantum gases versatile resource...

We investigate the possibility of a bistable phase in an open many-body system. To this end we discuss microscopic dynamics continuously off-resonantly driven Rydberg lattice gas regime strong decoherence. Our experimental results reveal prolongation temporal correlations with respect to lifetime single excitation and show evidence for formation finite-sized clusters steady state. simulate our data using simplified full rate-equation model. The are compatible metastable states associated...

We report on the observation of negative differential conductivity (NDC) in a quantum transport device for neutral atoms employing multimode tunneling junction. The system is realized with Bose-Einstein condensate loaded one-dimensional optical lattice high site occupancy. induce an initial difference chemical potential at one by local atom removal. ensuing dynamics are governed interplay between coupling, interaction energy, and intrinsic collisions, which turn coherent coupling into...

Obtaining full control over the internal and external quantum states of molecules is central goal ultracold chemistry allows for study coherent molecular dynamics, collisions tests fundamental laws physics. When additionally have a permanent electric dipole moment, dipolar gases spin-systems with long-range interactions as well applications in information processing are possible. Rydberg constitute class exotic molecules, which bound by interaction between electron ground state atom. They...

Eliminating atoms of a Bose-Einstein condensate in lattice from one cell is coherent perfect absorption the quantum liquid.

We provide a non-unit-disk framework to solve combinatorial optimization problems such as maximum cut and independent set on Rydberg quantum annealer. Our setup consists of many-body interacting system where locally controllable light shifts are applied individual qubits in order map the graph problem onto Ising spin model. Exploiting flexibility that optical tweezers offer terms spatial arrangement, our numerical simulations implement local-detuning protocol while globally driving annealer...

We study the transport of ultracold atoms in a tight optical lattice. For identical fermions system is insulating under an external force while for bosonic it conducting. This reflects different collisional properties particles and reveals role interparticle collisions establishing macroscopic perfectly periodic potential. Also case we can induce by creating regime through addition bosons. investigate as function rate observe transition from which mobility increases with increasing to one...

We have investigated Bose-Einstein condensates and ultra cold atoms in the vicinity of a surface magnetic microtrap. The are prepared along copper conductors at distances to between 300 um 20 um. In this range, lifetime decreases from s 0.7 showing linear dependence on distance surface. manifest weak thermal coupling surface, with measured heating rates remaining below 500 nK/s. addition, we observe periodic fragmentation condensate clouds when is approached.

We discuss how to engineer the phase and amplitude of a complex order parameter using localized dissipative perturbations. Our results are applied generate control various types atomic nonlinear matter waves (solitons) by means defects.

We theoretically demonstrate the possibility of observing macroscopic Zeno effect for nonlinear waveguides with localized dissipation. show existence stable stationary flows, which are balanced by losses in dissipative domain. The manifests itself nonmonotonic dependence flow on strength In particular, we highlight importance dissipation parameters phenomenon. Our results applicable to a large variety systems, including condensates atoms or quasiparticles and optical waveguides.

We characterize the dissipative phase transition in a driven Bose-Einstein condensate of neutral atoms. Our results generalize work on nonlinear Kerr resonators towards many modes and stronger interactions. measure effective Liouvillian gap analyze microscopic system dynamics, where we identify non-equilibrium condensation process.

We investigate theoretically and experimentally the center-of-mass motion of an ideal Fermi gas in a combined periodic harmonic potential. find crossover from conducting to insulating regime as energy moves first Bloch band into gap lattice. The is characterized by oscillation cloud about potential minimum, while case center mass remains on one side

We investigate the thermodynamics of one-dimensional Bose gases in strongly correlated regime. To this end, we prepare ensembles independent 1D a two-dimensional optical lattice and perform high-resolution situ imaging column-integrated density distribution. Using an inverse Abel transformation derive effective line-density profiles compare them to exact theoretical models. The high resolution allows for direct thermometry trapped ensembles. knowledge about temperature enables us extract...

We have performed high resolution photoassociation spectroscopy of rubidium ultra long-range Rydberg molecules in the vicinity 25$P$ state. Due to hyperfine interaction ground state perturber atom, emerging mixed singlet-triplet potentials contain contributions from both states. show that this can be used induce remote spin-flips atom upon excitation a molecule. When furthermore spin-orbit splitting is comparable state, orbital angular momentum electron entangled with nuclear spin atom. Our...

Understanding the universal properties of non-equilibrium phase transitions spreading processes is a challenging problem. This applies in particular to irregular and dynamically varying networks. We here investigate an experimentally accessible model system for such processes, namely absorbing-state transition (ASPT) Rydberg-excitation spreading, known as Rydberg facilitation, laser-driven gas mobile atoms. It occurs on graph, set by random atom positions and, depending temperature, changes...

We measure the temporal pair correlation function ${g}^{(2)}(\ensuremath{\tau})$ of a trapped gas bosons above and below critical temperature for Bose-Einstein condensation. The measurement is performed in situ by using local, time-resolved single-atom sensitive probing technique. Third- fourth-order functions are also extracted. develop theoretical model compare it with our experimental data, finding good quantitative agreement. discuss, finally, role interactions. Our results promote...

We have studied the associative ionization of a Rydberg atom and ground-state in an ultracold gas. The measured scattering cross section is 3 orders magnitude larger than geometrical size produced molecule. This giant enhancement reaction kinetics due to efficient directed mass transport which accelerated by electron. also find that total inelastic given electron's wave function.