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
The quantum regression theorem for out-of-time-ordered correlation functions
Philip Daniel Blocher, Klaus Molmer
We derive an extension of the quantum regression theorem to calculate out-of-time-order correlation functions in Markovian open quantum systems. While so far mostly being applied i…
Theory of Subradiant States of a One-Dimensional Two-Level Atom Chain
Yu-Xiang Zhang, Klaus Mølmer
Recently, the subradiant states of one-dimensional two-level atom chains coupled to light modes were found to have decay rates obeying a universal scaling, and an unexpected fermio…
Measurements with prediction and retrodiction on the collective spin of 10^{11} atoms beat the standard quantum limit
Han Bao, Junlei Duan, Xingda Lu +10
Quantum probes using uncorrelated particles give a limit on the measurement sensitivity referred to as the standard quantum limit (SQL). The SQL, however, can be overcome by ex…
Spontaneous emission of a sodium Rydberg atom close to an optical nanofibre
E Stourm, Y Zhang, M Lepers +5
We report on numerical calculations of the spontaneous emission rate of a Rydberg-excited sodium atom in the vicinity of an optical nanofibre. In particular, we study how this rate…
A Solvable Model for Decoupling of Interacting Clusters
Artem G. Volosniev, Aksel S. Jensen, Nathan L. Harshman +2
We consider M clusters of interacting particles, whose in-group interactions are arbitrary, and inter-group interactions are approximated by oscillator potentials. We show that the…
Counteracting systems of diabaticities using DRAG controls: The status after 10 years
L. S. Theis, F. Motzoi, S. Machnes +1
The task of controlling a quantum system under time and bandwidth limitations is made difficult by unwanted excitations of spectrally neighboring energy levels. In this article we…
Lasing in the superradiant crossover regime
Kamanasish Debnath, Yuan Zhang, Klaus Mølmer
A new class of laser, which harnesses coherence in both light and atoms, is possible with the use of ultra-cold alkaline earth atoms trapped in an optical lattice inside an optical…
Quantum interference device for controlled two-qubit operations
Niels Jakob Søe Loft, Morten Kjaergaard, Lasse Bjørn Kristensen +5
Universal quantum computing relies on high-fidelity entangling operations. Here we demonstrate that four coupled qubits can operate as a quantum gate, where two qubits control the…
Controlling the potential landscape and normal modes of ion Coulomb crystals by a standing wave optical potential
Thomas Lauprêtre, Rasmus B. Linnet, Ian D. Leroux +3
Light-induced control of ions within small Coulomb crystals is investigated. By intense intracavity optical standing wave fields, subwavelength localization of individual ions is a…
Interference effects in hybrid cavity optomechanics
Ondřej Černotík, Claudiu Genes, Aurélien Dantan
Radiation pressure forces in cavity optomechanics allow for efficient cooling of vibrational modes of macroscopic mechanical resonators, the manipulation of their quantum states, a…
A controllable two-qubit swapping gate using superconducting circuits
S. E. Rasmussen, K. S. Christensen, N. T. Zinner
In this paper we investigate a linear chain of qubits and determine that it can be configured into a conditional two-qubit swapping gate, where the first and last qubits of the cha…
Adiabatic preparation of squeezed states of oscillators and large spin systems coupled to a two-level system
Jiabao Chen, Denis Konstantinov, Klaus Mølmer
We study a single two-level system coupled resonantly to an oscillator mode or a large spin. By adiabatically turning on a linear driving term on the oscillator or the spin, the ei…
QEngine: An open-source C++ Library for Quantum Optimal Control of Ultracold Atoms
Jens Jakob Sørensen, Jesper Jensen, Till Heinzel +1
We present the first version of the QEngine, an open-source C++ library for simulating and controlling ultracold quantum systems using optimal control theory (OCT). The most notabl…
A dynamical approach to ancilla assisted quantum thermometry
Alexander Holm Kiilerich, Antonella De Pasquale, Vittorio Giovannetti
A scheme for improving the sensitivity of quantum thermometry is proposed where the sensing quantum system used to recover the temperature of an external bath is dynamically couple…
Realizing time crystals in discrete quantum few-body systems
R. E. Barfknecht, S. E. Rasmussen, A. Foerster +1
The exotic phenomenon of time translation symmetry breaking under periodic driving - the time crystal - has been shown to occur in many-body systems even in clean setups where diso…
Surface plasmon launching by polariton superradiance
Yu-Xiang Zhang, Yuan Zhang, Klaus Mølmer
The condition of phase matching prohibits the transfer of excitation from free-space photons to surface plasmon polaritons (SPP). We propose and analyze a scheme that excites an en…
Topological states in the Kronig-Penney model with arbitrary scattering potentials
Irina Reshodko, Albert Benseny, Judit Romhányi +1
We use an exact solution to the fundamental finite Kronig-Penney model with arbitrary positions and strengths of scattering sites to show that this iconic model can possess topolog…
Critical slowing down of multi-atom entanglement by Rydberg blockade
Tahereh Abad, Klaus Mølmer
Laser excitation pulses that lead to perfect adiabatic state transfer in an ensemble of three-level ladder atoms lead to highly entangled states of many atoms if their highest exci…
Quantum current in dissipative systems
Karen V. Hovhannisyan, Alberto Imparato
Describing current in open quantum systems can be problematic due to the subtle interplay of quantum coherence and environmental noise. Probing the noise-induced current can be det…
Quantum Control with Measurements and Quantum Zeno Dynamics
Jens Jakob Sørensen, Mogens Dalgaard, Alexander Holm Kiilerich +2
We introduce an efficient iterative method to prepare a target state in Hilbert spaces with high dimensionality using a combination of unitary evolution, measurements, and quantum…
Deterministic free-space source of single photons using Rydberg atoms
D. Petrosyan, K. Mølmer
We propose an efficient free-space scheme to create single photons in a well-defined spatiotemporal mode. To that end, we first prepare a single source atom in an excited Rydberg s…
Multispecies time-dependent restricted-active-space self-consistent-field theory for ultracold atomic and molecular gases
Camille Lévêque, Lars Bojer Madsen
We discuss the multispecies time-dependent restricted-active-space self-consistent-field theory, an \textit{ab initio} wavefunction-based theory for mixtures of ultracold atomic an…
Hypothesis testing with a continuously monitored quantum system
Alexander Holm Kiilerich, Klaus Mølmer
In a Bayesian analysis, the likelihood that specific candidate parameters govern the evolution of a quantum system are conditioned on the outcome of measurements which, in turn, ca…
Dicke Phase Transition in a Disordered Emitter-Graphene Plasmon System
Yu-Xiang Zhang, Yuan Zhang, Klaus Mølmer
We study the Dicke phase transition in a disordered system of emitters coupled to the plasmonic modes of a graphene monolayer. This system has unique properties associated with the…