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Phonon dressing of a facilitated one-dimensional Rydberg lattice gas (2022)
Journal Article
Magoni, M., Mazza, P., & Lesanovsky, I. (2022). Phonon dressing of a facilitated one-dimensional Rydberg lattice gas. SciPost Physics Core, 5(3), Article 041. https://doi.org/10.21468/SciPostPhysCore.5.3.041

We study the dynamics of a one-dimensional Rydberg lattice gas under facilitation (antiblockade) conditions which implements a so-called kinetically constrained spin system. Here an atom can only be excited to a Rydberg state when one of its neighbor... Read More about Phonon dressing of a facilitated one-dimensional Rydberg lattice gas.

Accelerating the approach of dissipative quantum spin systems towards stationarity through global spin rotations (2022)
Journal Article
Kochsiek, S., Carollo, F., & Lesanovsky, I. (2022). Accelerating the approach of dissipative quantum spin systems towards stationarity through global spin rotations. Physical Review A, 106(1), Article 012207. https://doi.org/10.1103/PhysRevA.106.012207

We consider open quantum systems whose dynamics is governed by a time-independent Markovian Lindblad master equation. Such systems approach their stationary state on a timescale that is determined by the spectral gap of the generator of the master eq... Read More about Accelerating the approach of dissipative quantum spin systems towards stationarity through global spin rotations.

Quantum fluctuations and correlations in open quantum Dicke models (2022)
Journal Article
Boneberg, M., Lesanovsky, I., & Carollo, F. (2022). Quantum fluctuations and correlations in open quantum Dicke models. Physical Review A, 106(1), Article 012212. https://doi.org/10.1103/PhysRevA.106.012212

In the vicinity of ground-state phase transitions quantum correlations can display nonanalytic behavior and critical scaling. This signature of emergent collective effects has been widely investigated within a broad range of equilibrium settings. How... Read More about Quantum fluctuations and correlations in open quantum Dicke models.

Fast spin squeezing by distance-selective long-range interactions with Rydberg molecule dressing (2022)
Journal Article
Wu, H., Lin, X. Y., Ding, Z. X., Zheng, S. B., Lesanovsky, I., & Li, W. (2022). Fast spin squeezing by distance-selective long-range interactions with Rydberg molecule dressing. Science China Physics, Mechanics and Astronomy, 65(8), Article 280311. https://doi.org/10.1007/s11433-022-1910-0

We propose a Rydberg molecule dressing scheme to create strong and long-ranged interactions at selective distances. This is achieved through laser coupling ground-state atoms off-resonantly to an attractive molecular curve of two interacting Rydberg... Read More about Fast spin squeezing by distance-selective long-range interactions with Rydberg molecule dressing.

Hierarchical classical metastability in an open quantum East model (2022)
Journal Article
Rose, D. C., MacIeszczak, K., Lesanovsky, I., & Garrahan, J. P. (2022). Hierarchical classical metastability in an open quantum East model. Physical Review E, 105(4), Article 044121. https://doi.org/10.1103/PhysRevE.105.044121

We study in detail an open quantum generalization of a classical kinetically constrained model - the East model - known to exhibit slow glassy dynamics stemming from a complex hierarchy of metastable states with distinct lifetimes. Using the recently... Read More about Hierarchical classical metastability in an open quantum East model.

Exact solution of a boundary time-crystal phase transition: Time-translation symmetry breaking and non-Markovian dynamics of correlations (2022)
Journal Article
Carollo, F., & Lesanovsky, I. (2022). Exact solution of a boundary time-crystal phase transition: Time-translation symmetry breaking and non-Markovian dynamics of correlations. Physical Review A, 105(4), Article L040202. https://doi.org/10.1103/PhysRevA.105.L040202

The breaking of the continuous time-translation symmetry manifests, in Markovian open quantum systems, through the emergence of nonstationary dynamical phases. Systems that display nonequilibrium transitions into these phases are referred to as time... Read More about Exact solution of a boundary time-crystal phase transition: Time-translation symmetry breaking and non-Markovian dynamics of correlations.

Phase diagram of quantum generalized Potts-Hopfield neural networks (2022)
Journal Article
Fiorelli, E., Lesanovsky, I., & Müller, M. (2022). Phase diagram of quantum generalized Potts-Hopfield neural networks. New Journal of Physics, 24(3), Article 033012. https://doi.org/10.1088/1367-2630/ac5490

We introduce and analyze an open quantum generalization of the q-state Potts-Hopfield neural network (NN), which is an associative memory model based on multi-level classical spins. The dynamics of this many-body system is formulated in terms of a Ma... Read More about Phase diagram of quantum generalized Potts-Hopfield neural networks.

Nonequilibrium Dark Space Phase Transition (2022)
Journal Article
Carollo, F., & Lesanovsky, I. (2022). Nonequilibrium Dark Space Phase Transition. Physical Review Letters, 128(4), Article 040603. https://doi.org/10.1103/PhysRevLett.128.040603

We introduce the concept of dark space phase transition, which may occur in open many-body quantum systems where irreversible decay, interactions, and quantum interference compete. Our study is based on a quantum many-body model that is inspired by c... Read More about Nonequilibrium Dark Space Phase Transition.

Quantum and Classical Temporal Correlations in (1+1)D Quantum Cellular Automata (2021)
Journal Article
Gillman, E., Carollo, F., & Lesanovsky, I. (2021). Quantum and Classical Temporal Correlations in (1+1)D Quantum Cellular Automata. Physical Review Letters, 127(23), Article 230502. https://doi.org/10.1103/PhysRevLett.127.230502

We employ (1 + 1)-dimensional quantum cellular automata to study the evolution of entangle-ment and coherence near criticality in quantum systems that display non-equilibrium steady-state phase transitions. This construction permits direct access to... Read More about Quantum and Classical Temporal Correlations in (1+1)D Quantum Cellular Automata.

Multipolar Fermi-surface deformation in a Rydberg-dressed Fermi gas with long-range anisotropic interactions (2021)
Journal Article
Zhou, Y., Nath, R., Wu, H., Lesanovsky, I., & Li, W. (2021). Multipolar Fermi-surface deformation in a Rydberg-dressed Fermi gas with long-range anisotropic interactions. Physical Review A, 104(6), Article L061302. https://doi.org/10.1103/physreva.104.l061302

We study theoretically the deformation of the Fermi surface (FS) of a three-dimensional gas of Rydberg-dressed 6Li atoms. The laser dressing to high-lying Rydberg D states results in angle-dependent soft-core-shaped interactions whose anisotropy is d... Read More about Multipolar Fermi-surface deformation in a Rydberg-dressed Fermi gas with long-range anisotropic interactions.

Designing nonequilibrium states of quantum matter through stochastic resetting (2021)
Journal Article
Perfetto, G., Carollo, F., Magoni, M., & Lesanovsky, I. (2021). Designing nonequilibrium states of quantum matter through stochastic resetting. Physical Review B, 104(18), Article L180302. https://doi.org/10.1103/PhysRevB.104.L180302

We consider closed quantum many-body systems subject to stochastic resetting. This means that their unitary time evolution is interrupted by resets at randomly selected times. When a reset takes place, the system is reinitialized to a state chosen fr... Read More about Designing nonequilibrium states of quantum matter through stochastic resetting.

Bragg condition for scattering into a guided optical mode (2021)
Journal Article
Olmos, B., Liedl, C., Lesanovsky, I., & Schneeweiss, P. (2021). Bragg condition for scattering into a guided optical mode. Physical Review A, 104(4), Article 043517. https://doi.org/10.1103/PhysRevA.104.043517

We theoretically investigate light scattering from an array of atoms into the guided modes of a waveguide. We observe that the scattering of a plane-wave laser field into the waveguide modes is dramatically enhanced for angles that deviate from the g... Read More about Bragg condition for scattering into a guided optical mode.

Dynamical Phases and Quantum Correlations in an Emitter-Waveguide System with Feedback (2021)
Journal Article
Buonaiuto, G., Carollo, F., Olmos, B., & Lesanovsky, I. (2021). Dynamical Phases and Quantum Correlations in an Emitter-Waveguide System with Feedback. Physical Review Letters, 127(13), 1-8. https://doi.org/10.1103/PhysRevLett.127.133601

We investigate the creation and control of emergent collective behavior and quantum correlations using feedback in an emitter-waveguide system using a minimal model. Employing homodyne detection of photons emitted from a laser-driven emitter ensemble... Read More about Dynamical Phases and Quantum Correlations in an Emitter-Waveguide System with Feedback.

Microscopic biasing of discrete-time quantum trajectories (2021)
Journal Article
Cilluffo, D., Buonaiuto, G., Lesanovsky, I., Carollo, A., Lorenzo, S., Palma, G. M., …Carollo, F. (2021). Microscopic biasing of discrete-time quantum trajectories. Quantum Science and Technology, 6(4), Article 045011. https://doi.org/10.1088/2058-9565/ac15e2

We develop a microscopic theory for biasing the quantum trajectories of an open quantum system, which renders rare trajectories typical. To this end we consider a discrete-time quantum dynamics, where the open system collides sequentially with qubit... Read More about Microscopic biasing of discrete-time quantum trajectories.

Collectively Encoded Rydberg Qubit (2021)
Journal Article
Spong, N. L. R., Jiao, Y., Hughes, O. D. W., Weatherill, K. J., Lesanovsky, I., & Adams, C. S. (2021). Collectively Encoded Rydberg Qubit. Physical Review Letters, 127(6), Article 063604. https://doi.org/10.1103/PhysRevLett.127.063604

We demonstrate a collectively-encoded qubit based on a single Rydberg excitation stored in an ensemble of N entangled atoms. Qubit rotations are performed by applying microwave fields that drive excitations between Rydberg states. Coherent read-out i... Read More about Collectively Encoded Rydberg Qubit.

Collectively Encoded Rydberg Qubit (2021)
Journal Article
Spong, N. L. R., Jiao, Y., Hughes, O. D. W., Weatherill, K. J., Lesanovsky, I., & Adams, C. S. (2021). Collectively Encoded Rydberg Qubit. Physical Review Letters, 127(6), Article 063604. https://doi.org/10.1103/PhysRevLett.127.063604

We demonstrate a collectively encoded qubit based on a single Rydberg excitation stored in an ensemble of N entangled atoms. Qubit rotations are performed by applying microwave fields that drive excitations between Rydberg states. Coherent readout is... Read More about Collectively Encoded Rydberg Qubit.

Exponentially accelerated approach to stationarity in Markovian open quantum systems through the Mpemba effect (2021)
Journal Article
Carollo, F., Lasanta, A., & Lesanovsky, I. (2021). Exponentially accelerated approach to stationarity in Markovian open quantum systems through the Mpemba effect. Physical Review Letters, 127(6), Article 060401. https://doi.org/10.1103/PhysRevLett.127.060401

Ergodicity-breaking and slow relaxation are intriguing aspects of nonequilibrium dynamics both in classical and in quantum settings. These phenomena are typically associated with phase transitions, e.g. the emergence of metastable regimes near a firs... Read More about Exponentially accelerated approach to stationarity in Markovian open quantum systems through the Mpemba effect.

Theory of classical metastability in open quantum systems (2021)
Journal Article
Macieszczak, K., Rose, D. C., Lesanovsky, I., & Garrahan, J. P. (2021). Theory of classical metastability in open quantum systems. Physical Review Research, 3(3), 1-26. https://doi.org/10.1103/PhysRevResearch.3.033047

We present a general theory of classical metastability in open quantum systems. Metastability is a consequence of a large separation in timescales in the dynamics, leading to the existence of a regime when states of the system appear stationary, befo... Read More about Theory of classical metastability in open quantum systems.

Exploring the Many-Body Dynamics Near a Conical Intersection with Trapped Rydberg Ions (2021)
Journal Article
Gambetta, F. M., Zhang, C., Hennrich, M., Lesanovsky, I., & Li, W. (2021). Exploring the Many-Body Dynamics Near a Conical Intersection with Trapped Rydberg Ions. Physical Review Letters, 126(23), Article 233404. https://doi.org/10.1103/physrevlett.126.233404

Conical intersections between electronic potential energy surfaces are paradigmatic for the study of nonadiabatic processes in the excited states of large molecules. However, since the corresponding dynamics occurs on a femtosecond timescale, their i... Read More about Exploring the Many-Body Dynamics Near a Conical Intersection with Trapped Rydberg Ions.

Exactness of Mean-Field Equations for Open Dicke Models with an Application to Pattern Retrieval Dynamics (2021)
Journal Article
Carollo, F., & Lesanovsky, I. (2021). Exactness of Mean-Field Equations for Open Dicke Models with an Application to Pattern Retrieval Dynamics. Physical Review Letters, 126(23), Article 230601. https://doi.org/10.1103/physrevlett.126.230601

Open quantum Dicke models are paradigmatic systems for the investigation of light-matter interaction in out-of-equilibrium quantum settings. Albeit being structurally simple, these models can show intriguing physics. However, obtaining exact results... Read More about Exactness of Mean-Field Equations for Open Dicke Models with an Application to Pattern Retrieval Dynamics.