József Fortágh
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View article: Shaping Cold Atom Clouds with a Vortex Beam
Shaping Cold Atom Clouds with a Vortex Beam Open
We introduce a method for shaping a cold atom cloud using a vortex laser beam with a polarisation singularity at its center, which creates a point of vanishing intensity. Exploiting this feature we experimentally demonstrate two different …
View article: Compact detector for atom-atom correlations on an atom chip
Compact detector for atom-atom correlations on an atom chip Open
We present a compact, ionization-based detector for the state-selective and spatially resolved measurement of individual Rydberg atoms trapped in the vicinity of an atom chip. The system combines an electrostatic lens system for guiding ch…
View article: Bandwidth enhanced current noise suppression with a SERF magnetometer
Bandwidth enhanced current noise suppression with a SERF magnetometer Open
This work investigates the behavior of a spin-exchange relaxation-free (SERF) magnetometer integrated into the feedback branch of a closed-loop control circuit, designed to actively suppress noise from a current source. In this configurati…
View article: Superconducting on-chip microwave cavity for tunable hybrid systems with optically trapped Rydberg atoms
Superconducting on-chip microwave cavity for tunable hybrid systems with optically trapped Rydberg atoms Open
Hybrid quantum systems are highly promising platforms for addressing important challenges of quantum information science and quantum sensing. Their implementation, however, is technologically non-trivial, since each component typically has…
View article: Trapping potentials and quantum gates for microwave-dressed Rydberg atoms on an atom chip: Data
Trapping potentials and quantum gates for microwave-dressed Rydberg atoms on an atom chip: Data Open
This dataset contains Monte Carlo simulation results supporting the figures presented in the article "Trapping potentials and quantum gates for microwave-dressed Rydberg atoms on an atom chip" (arXiv:2504.10349). The data correspond to sim…
View article: Reinforcement learning in cold atom experiments
Reinforcement learning in cold atom experiments Open
Cold atom traps are at the heart of many quantum applications in science and technology. The preparation and control of atomic clouds involves complex optimization processes, that could be supported and accelerated by machine learning. In …
View article: Coherent interface between optical and microwave photons on an integrated superconducting atom chip
Coherent interface between optical and microwave photons on an integrated superconducting atom chip Open
Sub-wavelength arrays of atoms exhibit remarkable optical properties, analogous to those of phased array antennas, such as collimated directional emission or nearly perfect reflection of light near the collective resonance frequency. We pr…
View article: Reinforcement Learning in Ultracold Atom Experiments
Reinforcement Learning in Ultracold Atom Experiments Open
Cold atom traps are at the heart of many quantum applications in science and technology. The preparation and control of atomic clouds involves complex optimization processes, that could be supported and accelerated by machine learning. In …
View article: Coherent interface between optical and microwave photons on an integrated superconducting atom chip
Coherent interface between optical and microwave photons on an integrated superconducting atom chip Open
Sub-wavelength arrays of atoms exhibit remarkable optical properties, analogous to those of phased array antennas, such as collimated directional emission or nearly perfect reflection of light near the collective resonance frequency. We pr…
View article: Time-resolved observation of a dynamical phase transition with atoms in a cavity
Time-resolved observation of a dynamical phase transition with atoms in a cavity Open
The transparence of a laser-driven optical resonator containing an ensemble\nof cold atoms can have two distinct, robust states. Atoms in their initially\nprepared pure state blockade the transmission by detuning the cavity mode from\nthe …
View article: Cavity-driven Rabi oscillations between Rydberg states of atoms trapped on a superconducting atom chip
Cavity-driven Rabi oscillations between Rydberg states of atoms trapped on a superconducting atom chip Open
Hybrid quantum systems involving cold atoms and microwave resonators can enable cavity-mediated infinite-range interactions between atomic spin systems and realize atomic quantum memories and transducers for microwave-to-optical conversion…
View article: Opticlock: Transportable and easy-to-operate optical single-ion clock
Opticlock: Transportable and easy-to-operate optical single-ion clock Open
We report on a transportable and easy-to-operate optical clock utilizing the 2S1/2 - 2D3/2 transition of a single trapped 171Yb+ ion at 436 nm. Developed within a pilot project for quantum technology in Germany lead by industry, the clock …
View article: Roadmap on Atomtronics: State of the art and perspective
Roadmap on Atomtronics: State of the art and perspective Open
Atomtronics deals with matter-wave circuits of ultracold atoms manipulated through magnetic or laser-generated guides with different shapes and intensities. In this way, new types of quantum networks can be constructed in which coherent fl…
View article: Collective self-trapping of atoms in a cavity
Collective self-trapping of atoms in a cavity Open
We study experimentally the optical dipole trapping of a cloud of cold atoms in a high-finesse cavity in the parameter regime where the atomic back-action on the cavity mode is significant. Back-action based effects lead to state selective…
View article: Cavity driven Rabi oscillations between Rydberg states of atoms trapped on a superconducting atom chip
Cavity driven Rabi oscillations between Rydberg states of atoms trapped on a superconducting atom chip Open
Hybrid quantum systems involving cold atoms and microwave resonators can enable cavity-mediated infinite-range interactions between atomic spin systems and realize atomic quantum memories and transducers for microwave to optical conversion…
View article: Roadmap on Atomtronics
Roadmap on Atomtronics Open
Atomtronics is an emerging field of quantum technology dealing with matter-wave circuits of ultra-cold atoms manipulated in magnetic or laser-generated guides of different shapes and intensity. Atomtronic circuits are promised to define qu…
View article: Controlling the Dipole Blockade and Ionization Rate of Rydberg Atoms in Strong Electric Fields
Controlling the Dipole Blockade and Ionization Rate of Rydberg Atoms in Strong Electric Fields Open
We study a hitherto unexplored regime of the Rydberg excitation blockade using highly Stark-shifted, yet long-living, states of Rb atoms subject to electric fields above the classical ionization limit. Such states allow tuning the dipole-d…
View article: Roadmap on Atomtronics: State of the art and perspective
Roadmap on Atomtronics: State of the art and perspective Open
Atomtronics deals with matter-wave circuits of ultra-cold atoms manipulated through magnetic or laser-generated guides with different shapes and intensities. In this way, new types of quantum networks can be constructed, in which coherent …
View article: State of the art and perspective on Atomtronics
State of the art and perspective on Atomtronics Open
Atomtronics deals with matter-wave circuits of ultra-cold atoms manipulated through magnetic or laser-generated guides with different shapes and intensities. In this way, new types of quantum networks can be constructed, in which coherent …
View article: Outcoupling from a Bose-Einstein condensate in the strong-field limit
Outcoupling from a Bose-Einstein condensate in the strong-field limit Open
Atoms can be extracted from a trapped Bose-Einstein condensate (BEC) by driving spin-flips to untrapped states. The coherence properties of the BEC are transfered to the released atoms, creating a coherent beam of matter refered to as an a…
View article: Erratum: Ionization spectra of highly Stark-shifted rubidium Rydberg states [Phys. Rev. A <b>96</b>, 013427 (2017)]
Erratum: Ionization spectra of highly Stark-shifted rubidium Rydberg states [Phys. Rev. A <b>96</b>, 013427 (2017)] Open
Received 26 November 2018DOI:https://doi.org/10.1103/PhysRevA.98.069901©2018 American Physical SocietyPhysics Subject Headings (PhySH)Research AreasAtomic spectraMultiphoton or tunneling ionization & excitationStark effectPhysical SystemsI…
View article: Erratum: Observation of the motional Stark shift in low magnetic fields [Phys. Rev. A <b>96</b>, 043401 (2017)]
Erratum: Observation of the motional Stark shift in low magnetic fields [Phys. Rev. A <b>96</b>, 043401 (2017)] Open
Received 13 July 2018DOI:https://doi.org/10.1103/PhysRevA.98.019904©2018 American Physical SocietyPhysics Subject Headings (PhySH)Research AreasStark effectZeeman effectPhysical SystemsRydberg atoms & moleculesPropertiesElectric momentMagn…
View article: Faithful state transfer between two-level systems via an actively cooled finite-temperature cavity
Faithful state transfer between two-level systems via an actively cooled finite-temperature cavity Open
We consider state transfer between two qubits - effective two-level systems represented by Rydberg atoms - via a common mode of a microwave cavity at finite temperature. We find that when both qubits have the same coupling strength to the …
View article: Observation of the motional Stark shift in low magnetic fields
Observation of the motional Stark shift in low magnetic fields Open
We report on the observation of the motional Stark effect of highly excited\n$^{87}$Rb Rydberg atoms moving in the presence of a weak homogeneous magnetic\nfield in a vapor cell. Employing electromagnetically induced transparency for\nspec…
View article: Second-order correlations in single-particle interferometry
Second-order correlations in single-particle interferometry Open
Interferometers with single particles are susceptible for dephasing\nperturbations from the environment, such as electromagnetic oscillations or\nmechanical vibrations. On the one hand, this limits sensitive quantum phase\nmeasurements as …
View article: Entanglement and entropy production in coupled single-mode Bose-Einstein condensates
Entanglement and entropy production in coupled single-mode Bose-Einstein condensates Open
We investigate the time evolution of the entanglement entropy of coupled\nsingle-mode Bose-Einstein condensates in a double well potential at $T=0$\ntemperature, by combining numerical results with analytical approximations. We\nfind that …
View article: Ionization spectra of highly Stark-shifted rubidium Rydberg states
Ionization spectra of highly Stark-shifted rubidium Rydberg states Open
We report on the observation and numerical calculation of ionization spectra\nof highly Stark-shifted Rydberg states of rubidium beyond the classical\nionization threshold. In the numerical calculations, a complex absorbing\npotential (CAP…
View article: A high resolution ion microscope for cold atoms
A high resolution ion microscope for cold atoms Open
We report on an ion-optical system that serves as a microscope for ultracold\nground state and Rydberg atoms. The system is designed to achieve a\nmagnification of up to 1000 and a spatial resolution in the 100 nm range,\nthereby surpassin…
View article: Noise spectroscopy with a quantum gas
Noise spectroscopy with a quantum gas Open
We report on the spectral analysis and the local measurement of intensity\ncorrelations of microwave fields using ultra cold quantum gases. The\nfluctuations of the electromagnetic field induce spin flips in a magnetically\ntrapped quantum…