All Outputs (138)

Microscopic biasing of discrete-time quantum trajectories (2021)
Journal Article

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

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

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

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

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

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

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

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

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

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

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

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

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.

Long-Range Multibody Interactions and Three-Body Antiblockade in a Trapped Rydberg Ion Chain (2020)
Journal Article

Trapped Rydberg ions represent a flexible platform for quantum simulation and information processing which combines a high degree of control over electronic and vibrational degrees of freedom. The possibility to individually excite ions to high-lying... Read More about Long-Range Multibody Interactions and Three-Body Antiblockade in a Trapped Rydberg Ion Chain.

Nonequilibrium Phase Transitions in (1+1)-Dimensional Quantum Cellular Automata with Controllable Quantum Correlations (2020)
Journal Article

Motivated by recent progress in the experimental development of quantum simulators based on Rydberg atoms, we introduce and investigate the dynamics of a class of (1+1)-dimensional quantum cellular automata. These non-equilibrium many-body models, wh... Read More about Nonequilibrium Phase Transitions in (1+1)-Dimensional Quantum Cellular Automata with Controllable Quantum Correlations.

Signatures of Associative Memory Behavior in a Multimode Dicke Model (2020)
Journal Article

© 2020 American Physical Society. Dicke-like models can describe a variety of physical systems, such as atoms in a cavity or vibrating ion chains. In equilibrium these systems often feature a radical change in their behavior when switching from weak... Read More about Signatures of Associative Memory Behavior in a Multimode Dicke Model.

Vibrational dressing in kinetically constrained Rydberg spin systems (2020)
Journal Article

Quantum spin systems with kinetic constraints have become paradigmatic for exploring collective dynamical behavior in many-body systems. Here we discuss a facilitated spin system which is inspired by recent progress in the realization of Rydberg quan... Read More about Vibrational dressing in kinetically constrained Rydberg spin systems.

Reaching the quantum Hall regime with rotating Rydberg-dressed atoms (2020)
Journal Article

Despite the striking progress in the field of quantum gases, one of their much anticipated applications—the simulation of quantum Hall states—remains elusive: all experimental approaches so far have failed in reaching a sufficiently small ratio betwe... Read More about Reaching the quantum Hall regime with rotating Rydberg-dressed atoms.

Nonequilibrium Quantum Many-Body Rydberg Atom Engine (2020)
Journal Article

The standard approach to quantum engines is based on equilibrium systems and on thermo-dynamic transformations between Gibbs states. However, non-equilibrium quantum systems offer enhanced experimental flexibility in the control of their parameters a... Read More about Nonequilibrium Quantum Many-Body Rydberg Atom Engine.

Dissipative quantum state preparation and metastability in two-photon micromasers (2020)
Journal Article

We study the preparation of coherent quantum states in a two-photon micromaser for applications in quantum metrology. While this setting can be in principle realized in a host of physical systems, we consider atoms interacting with the field of a cav... Read More about Dissipative quantum state preparation and metastability in two-photon micromasers.