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Rydberg Quantum Simulators
EC | H2020 | RIA
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  • Crossover from the classical to the quantum Kibble-Zurek scaling

    Silvi, Pietro; Morigi, Giovanna; Calarco, Tommaso; Montangero, Simone (2015)
    Projects: EC | RYSQ (640378)
    The Kibble-Zurek (KZ) hypothesis identifies the relevant time scales in out-of-equilibrium dynamics of critical systems employing concepts valid at equilibrium: It predicts the scaling of the defect formation immediately after quenches across classical and quantum phase transitions as a function of the quench speed. Here we study the crossover between the scaling dictated by a slow quench, which is ruled by the critical properties of the quantum phase transition, and the excitations due to a ...

    Photon Subtraction by Many-Body Decoherence

    Murray, Callum R.; Mirgorodskiy, Ivan; Tresp, Christoph; Braun, Christoph; Paris-Mandoki, Asaf; Gorshkov, Alexey V.; Hofferberth, Sebastian; Pohl, Thomas (2017)
    Projects: EC | RYSQ (640378)
    We experimentally and theoretically investigate the scattering of a photonic quantum field from another stored in a strongly interacting atomic Rydberg ensemble. Considering the many-body limit of this problem, we derive an exact solution to the scattering-induced spatial decoherence of multiple stored photons, allowing for a rigorous understanding of the underlying dissipative quantum dynamics. Combined with our experiments, this analysis reveals a correlated coherence-protection process in ...

    Coherent Photon Manipulation in Interacting Atomic Ensembles

    Murray, Callum R.; Pohl, Thomas (2017)
    Projects: EC | RYSQ (640378)
    Coupling photons to Rydberg excitations in a cold atomic gas yields unprecedentedly large optical nonlinearities at the level of individual light quanta. Here, the basic mechanism exploits the strong interactions between Rydberg atoms to block the formation of nearby dark-state polaritons. However, the dissipation associated with this mechanism ultimately limits the performance of many practical applications. In this work, we propose a new approach to strong photon interactions via a largely ...

    Coherence susceptibility as a probe of quantum phase transitions

    Chen, Jin-Jun; Cui, Jian; Zhang, Yu-Ran; Fan, Heng (2016)
    Projects: EC | RYSQ (640378)
    We introduce a coherence susceptibility method, based on the fact that it signals quantum fluctuations, for identifying quantum phase transitions, which are induced by quantum fluctuations. This method requires no prior knowledge of order parameter, and there is no need for careful considerations concerning the choice of a bipartition of the system. It can identify different types of quantum phase transition points exactly. At finite temperatures, where quantum criticality is influenced by th...

    Sub-Poissonian Statistics of Jamming Limits in Ultracold Rydberg Gases

    Sanders, Jaron; Jonckheere, Matthieu; Kokkelmans, Servaas (2015)
    Projects: EC | RYSQ (640378)
    Several recent experiments have established by measuring the Mandel Q parameter that the number of Rydberg excitations in ultracold gases exhibits sub-Poissonian statistics. This effect is attributed to the Rydberg blockade that occurs due to the strong interatomic interactions between highly-excited atoms. Because of this blockade effect, the system can end up in a state in which all particles are either excited or blocked: a jamming limit. We analyze appropriately constructed random-graph m...

    Positive Tensor Network Approach for Simulating Open Quantum Many-Body Systems

    Werner, A. H.; Jaschke, D.; Silvi, P.; Kliesch, Martin; Calarco, T.; Eisert, Jens; Montangero, S. (2017)
    Projects: EC | RYSQ (640378)
    Open quantum many-body systems play an important role in quantum optics and condensed matter physics, and capture phenomena like transport, the interplay between Hamiltonian and incoherent dynamics, and topological order generated by dissipation. We introduce a versatile and practical method to numerically simulate one-dimensional open quantum many-body dynamics using tensor networks. It is based on representing mixed quantum states in a locally purified form, which guarantees that positivity...

    Topological states in a microscopic model of interacting fermions

    Lang, Nicolai; Büchler, Hans Peter (2015)
    Projects: EC | RYSQ (640378)
    We present a microscopic model of interacting fermions where the ground state degeneracy is topologically protected. The model is based on a double-wire setup with local interactions in a particle number conserving setting. A compelling property of this model is the exact solvability for its ground states and low energy excitations. We demonstrate the appearance of topologically protected edge states and derive their braiding properties on a microscopic level. We find the non-abelian statisti...

    Applying Electric and Magnetic Field Bias in a 3D Superconducting Waveguide Cavity with High Quality Factor

    Stammeier, M.; Garcia, S.; Wallraff, A. (2017)
    Projects: EC | RYSQ (640378)
    Three-dimensional microwave waveguide cavities are essential tools for many cavity quantum electrodynamics experiments. However, the need to control quantum emitters with dc magnetic fields inside the cavity often limits such experiments to normal-conducting cavities with relatively low quality factors of about $10^4$. Similarly, controlling quantum emitters with dc electric fields in normal- and superconducting waveguide cavities has so far been difficult, because the insertion of dc electro...

    Controlling Stray Electric Fields on an Atom Chip for Rydberg Experiments

    Davtyan, D.; Machluf, S.; Soudijn, M. L.; Naber, J. B.; van Druten, N. J.; Heuvell, H. B. van Linden van den; Spreeuw, R. J. C. (2017)
    Projects: EC | RYSQ (640378)
    Experiments handling Rydberg atoms near surfaces must necessarily deal with the high sensitivity of Rydberg atoms to (stray) electric fields that typically emanate from adsorbates on the surface. We demonstrate a method to modify and reduce the stray electric field by changing the adsorbates distribution. We use one of the Rydberg excitation lasers to locally affect the adsorbed dipole distribution. By adjusting the averaged exposure time we change the strength (with the minimal value less th...

    Grover search algorithm with Rydberg-blockaded atoms: Quantum Monte Carlo simulations

    Petrosyan, David; Saffman, Mark; Mølmer, Klaus (2015)
    Projects: EC | RYSQ (640378)
    We consider the Grover search algorithm implementation for a quantum register of size $N = 2^k$ using k (or k +1) microwave- and laser-driven Rydberg-blockaded atoms, following the proposal by M{\o}lmer, Isenhower, and Saffman [J. Phys. B 44, 184016 (2011)]. We suggest some simplifications for the microwave and laser couplings, and analyze the performance of the algorithm for up to k = 4 multilevel atoms under realistic experimental conditions using quantum stochastic (Monte-Carlo) wavefuncti...
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