Counting papers with at most 25 authors, so collaboration author lists do not stand in for the people here.
- Centre National de la Recherche ScientifiqueFR640 papers
- The University of SydneyAU475 papers
- University of BirminghamGB381 papers
- University of CopenhagenDK357 papers
- Instituto de Astrofísica de CanariasES341 papers
- Universidad de La LagunaES308 papers
- Commissariat à l'Énergie Atomique et aux Énergies AlternativesFR304 papers
- California Institute of TechnologyUS282 papers
- Center for Astrophysics Harvard & SmithsonianUS281 papers
- European Southern ObservatoryCL265 papers
- Astrophysique, Instrumentation et ModélisationFR259 papers
- Osservatorio Astronomico di PadovaIT258 papers
33 papers · 2 filters
Optimal collection of radiation emitted by a trapped atomic ensemble
A. Kurkó, P. Domokos, A. Vukics +4
Trapped atomic ensembles are convenient systems for quantum information storage in the long-lived sublevels of the electronic ground state and its conversion to propagating optical…
Retrodiction beyond the Heisenberg uncertainty relation
Han Bao, Shenchao Jin, Junlei Duan +4
In quantum mechanics, the Heisenberg uncertainty relation presents an ultimate limit to the precision by which one can predict the outcome of position and momentum measurements on…
Radiation Eigenmodes of Dicke Superradiance
Benjamin Lemberger, Klaus Mølmer
We calculate the field eigenmodes of the superradiant emission from an ensemble of two-level atoms. While numerical techniques are effective due to the symmetry of the problem,…
Collective emission of photons from dense, dipole-dipole interacting atomic ensembles
David Petrosyan, Klaus Mølmer
We study the collective radiation properties of cold, trapped ensembles of atoms. We consider the high density regime with the mean interatomic distance being comparable to, or sma…
Lattice gauge theory and dynamical quantum phase transitions using noisy intermediate scale quantum devices
Simon Panyella Pedersen, Nikolaj Thomas Zinner
Lattice gauge theories are a fascinating and rich class of theories relating to the most fundamental models of particle physics, and as experimental control on the quantum level in…
Quantum thermodynamically consistent local master equations
Adam Hewgill, Gabriele De Chiara, Alberto Imparato
Local master equations are a widespread tool to model open quantum systems, especially in the context of many-body systems. These equations, however, are believed to lead to thermo…
Rydberg Noisy-Dressing and applications in making soliton-molecules and droplet quasi-crystals
Mohammadsadegh Khazali
The current advances in the field of ultra-cold atoms and atomic traps recall new controllable long-range interactions. These interactions are expected to extend the range of reali…
Time-dependent atomic magnetometry with a recurrent neural network
Maryam Khanahmadi, Klaus Mølmer
We propose to employ a recurrent neural network to estimate a fluctuating magnetic field from continuous optical Faraday rotation measurement on an atomic ensemble. We show that an…
Ancilla mediated qubit readout and heralded entanglement between rare-earth dopant ions in crystals
Kamanasish Debnath, Alexander Holm Kiilerich, Klaus Mølmer
Owing to their long excited state lifetimes, rare-earth ions in crystals are widely used in quantum applications. To allow optical readout of the qubit state of individual ions, we…
Estimating a fluctuating magnetic field with a continuously monitored atomic ensemble
Cheng Zhang, Klaus Molmer
We study the problem of estimating a time dependent magnetic field by continuous optical probing of an atomic ensemble. The magnetic field is assumed to follow a stochastic Ornstei…
Fast multi-qubit gates by adiabatic evolution in interacting excited state manifolds
Mohammadsadegh Khazali, Klaus Mølmer
Quantum computing and quantum simulation can be implemented by concatenation of one- and two-qubit gates and interactions. For most physical implementations, however, it may be adv…
Chiral resolution by composite Raman pulses
Boyan T. Torosov, Michael Drewsen, Nikolay V. Vitanov
We present two methods for efficient detection of chiral molecules based on sequences of single pulses and Raman pulse pairs. The chiral molecules are modelled by a closed-loop thr…
Strongly correlated states of light in chiral chains of three-level quantum emitters
Ole Aae Iversen, Thomas Pohl
We study the correlated transport of photons through a chain of three-level emitters that are coupled chirally to a photonic mode of a waveguide. It is found that this system can t…
Subradiant emission from regular atomic arrays: universal scaling of decay rates from the generalized Bloch theorem
Yu-Xiang Zhang, Klaus Mølmer
The Hermitian part of the dipole-dipole interaction in infinite periodic arrays of two-level atoms yields an energy band of singly excited states. In this Letter, we show that a di…
Hessian-based optimization of constrained quantum control
Mogens Dalgaard, Felix Motzoi, Jesper Hasseriis Mohr Jensen +1
Efficient optimization of quantum systems is a necessity for reaching fault tolerant thresholds. A standard tool for optimizing simulated quantum dynamics is the gradient-based \te…
Reducing the amount of single-qubit rotations in VQE and related algorithms
S. E. Rasmussen, N. J. S. Loft, T. Bækkegaard +2
With the advent of hybrid quantum classical algorithms using parameterized quantum circuits the question of how to optimize these algorithms and circuits emerges. In this paper we…
Quantum Computation of Eigenvalues within Target Intervals
Phillip W. K. Jensen, Lasse Bjørn Kristensen, Jakob S. Kottmann +1
There is widespread interest in calculating the energy spectrum of a Hamiltonian, for example to analyze optical spectra and energy deposition by ions in materials. In this study,…
Approximate Dynamics Lead to More Optimal Control: Efficient Exact Derivatives
Jesper Hasseriis Mohr Jensen, Frederik Skovbo Møller, Jens Jakob Sørensen +1
Accurate derivatives are important for efficiently locally traversing and converging in quantum optimization landscapes. By deriving analytically exact control derivatives (gradien…
Position- and momentum-squeezed quantum states in micro-scale mechanical resonators
Y. Le Coq, K. Mølmer, S. Seidelin
A challenge of modern physics is to investigate the quantum behavior of a bulk material object, for instance a mechanical oscillator. We have earlier demonstrated that by coupling…
Crowdsourcing human common sense for quantum control
Jesper Hasseriis Mohr Jensen, Miroslav Gajdacz, Shaeema Zaman Ahmed +6
Citizen science methodologies have over the past decade been applied with great success to help solve highly complex numerical challenges. Here, we take early steps in the quantum…
Unresolved sideband photon recoil spectroscopy of molecular ions
Emilie H. Clausen, Vincent Jarlaud, Karin Fisher +3
We reflect on the prospect of exploiting the recoil associated with absorption and emission of photons to perform spectroscopy of a single molecular ion. For this recoil to be dete…
Continuous protection of a collective state from inhomogeneous dephasing
Ran Finkelstein, Ohr Lahad, Itsik Cohen +4
We introduce and demonstrate a scheme for eliminating the inhomogeneous dephasing of a collective quantum state. The scheme employs off-resonant fields that continuously dress the…
Self-stimulated pulse echo trains from inhomogeneously broadened spin ensembles
Kamanasish Debnath, Gavin Dold, John J. L. Morton +1
We show experimentally and describe theoretically how a conventional magnetic resonance Hahn echo sequence can lead to a self-stimulated pulse echo train when an inhomogeneously br…
Quantum interactions with pulses of radiation
Alexander Holm Kiilerich, Klaus Mølmer
This article presents a general master equation formalism for the interaction between travelling pulses of quantum radiation and localized quantum systems. Traveling fields populat…