Interaction signatures and non-Gaussian photon states from a strongly driven atomic ensemble coupled to a nanophotonic waveguide

Olmos, B.; Buonaiuto, G.; Schneeweiss, P.; Lesanovsky, I.

doi:10.1103/physreva.102.043711

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.

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.

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.

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.

Machine learning time-local generators of open quantum dynamics (2021)
Journal Article
Mazza, P. P., Zietlow, D., Carollo, F., Andergassen, S., Martius, G., & Lesanovsky, I. (2021). Machine learning time-local generators of open quantum dynamics. Physical Review Research, 3(2), Article 023084. https://doi.org/10.1103/physrevresearch.3.023084

In the study of closed many-body quantum systems one is often interested in the evolution of a subset of degrees of freedom. On many occasions it is possible to approach the problem by performing an appropriate decomposition into a bath and a system.... Read More about Machine learning time-local generators of open quantum dynamics.

Measurement-feedback control of the chiral photon emission from an atom chain into a nanofiber (2021)
Journal Article
Buonaiuto, G., Lesanovsky, I., & Olmos, B. (2021). Measurement-feedback control of the chiral photon emission from an atom chain into a nanofiber. Journal of the Optical Society of America B, 38(5), 1470-1476. https://doi.org/10.1364/josab.422893

We theoretically investigate measurement-based feedback control of a laser-driven one-dimensional atomic chain interfaced with a nanofiber. The interfacing leads to all-to-all interactions among the atomic emitters and induces chirality, i.e. the dir... Read More about Measurement-feedback control of the chiral photon emission from an atom chain into a nanofiber.

Numerical simulation of quantum nonequilibrium phase transitions without finite-size effects (2021)
Journal Article
Gillman, E., Carollo, F., & Lesanovsky, I. (2021). Numerical simulation of quantum nonequilibrium phase transitions without finite-size effects. Physical Review A, 103(4), Article L040201. https://doi.org/10.1103/physreva.103.l040201

Classical (1 + 1)D cellular automata, as for instance Domany-Kinzel cellular automata, are paradigmatic systems for the study of non-equilibrium phenomena. Such systems evolve in discrete time-steps, and are thus free of time-discretisation errors. M... Read More about Numerical simulation of quantum nonequilibrium phase transitions without finite-size effects.

Emergent Bloch Oscillations in a Kinetically Constrained Rydberg Spin Lattice (2021)
Journal Article
Magoni, M., Mazza, P., & Lesanovsky, I. (2021). Emergent Bloch Oscillations in a Kinetically Constrained Rydberg Spin Lattice. Physical Review Letters, 126(10), Article 103002. https://doi.org/10.1103/physrevlett.126.103002

We explore the relaxation dynamics of elementary spin clusters in a kinetically constrained spin system. Inspired by experiments with Rydberg lattice gases, we focus on the situation in which an excited spin leads to a "facilitated" excitation of a n... Read More about Emergent Bloch Oscillations in a Kinetically Constrained Rydberg Spin Lattice.

Nonequilibrium Many-Body Quantum Engine Driven by Time-Translation Symmetry Breaking (2020)
Journal Article
Carollo, F., Brandner, K., & Lesanovsky, I. (2020). Nonequilibrium Many-Body Quantum Engine Driven by Time-Translation Symmetry Breaking. Physical Review Letters, 125(24), Article 240602. https://doi.org/10.1103/PhysRevLett.125.240602

Quantum many-body systems out of equilibrium can host intriguing phenomena such as transitions to exotic dynamical states. Although this emergent behaviour can be observed in experiments, its potential for technological applications is largely unexpl... Read More about Nonequilibrium Many-Body Quantum Engine Driven by Time-Translation Symmetry Breaking.

Interaction signatures and non-Gaussian photon states from a strongly driven atomic ensemble coupled to a nanophotonic waveguide (2020)
Journal Article
Olmos, B., Buonaiuto, G., Schneeweiss, P., & Lesanovsky, I. (2020). Interaction signatures and non-Gaussian photon states from a strongly driven atomic ensemble coupled to a nanophotonic waveguide. Physical Review A, 102(4), Article 043711. https://doi.org/10.1103/physreva.102.043711

We study theoretically a laser-driven one-dimensional chain of atoms interfaced with the guided optical modes of a nanophotonic waveguide. The period of the chain and the orientation of the laser field can be chosen such that emission occurs predomin... Read More about Interaction signatures and non-Gaussian photon states from a strongly driven atomic ensemble coupled to a nanophotonic waveguide.

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