323 citations
Counting papers with at most 25 authors, so collaboration author lists do not stand in for the people here.
- Aarhus UniversityDK63 papers
- Universidade Federal do Rio Grande do SulBR6 papers
- Max Planck Institute for Radio AstronomyDE5 papers
- University of CopenhagenDK5 papers
- London Centre for NanotechnologyGB4 papers
- Technische Universität DarmstadtDE4 papers
- Hamburg Centre for Ultrafast Imaging3 papers
- Universität HamburgDE3 papers
- University College LondonGB3 papers
- University of BonnDE3 papers
- AlbaNovaSE2 papers
- Austrian Academy of SciencesAT2 papers
26 papers · 1 filter
Interaction of quantum systems with single pulses of quantized radiation
Victor Rueskov Christiansen, Alexander Holm Kiilerich, Klaus Mølmer
The interaction of a propagating pulse of quantum radiation with a localized quantum system can be described by a cascaded master equation with a distinct initially populated input…
Manipulating synthetic gauge fluxes via multicolor dressing of Rydberg-atom arrays
Xiaoling Wu, Fan Yang, Shuo Yang +4
Arrays of highly excited Rydberg atoms can be used as powerful quantum simulation platforms. Here, we introduce an approach that makes it possible to implement fully controllable e…
Quantum non-demolition measurements of moving target states
A. L. Andersen, K. Mølmer
We present a protocol for probing the state of a quantum system by its resonant coupling and entanglement with a meter system. By continuous measurement of a time evolving meter ob…
Microscopic dynamics and an effective Landau-Zener transition in the quasi-adiabatic preparation of spatially ordered states of Rydberg excitations
A. F. Tzortzakakis, D. Petrosyan, M. Fleischhauer +1
We examine the adiabatic preparation of spatially-ordered Rydberg excitations of atoms in finite one-dimensional lattices by frequency-chirped laser pulses, as realized in a number…
Cavity Quantum Electrodynamics Effects with Nitrogen Vacancy Center Spins in Diamond and Microwave Resonators at Room Temperature
Yuan Zhang, Qilong Wu, Shi-Lei Su +3
Cavity quantum electrodynamics (C-QED) effects, such as Rabi splitting, Rabi oscillations and superradiance, have been demonstrated with nitrogen vacancy center spins in diamond in…
Topological phases in interacting spin-1 systems
A. Alnor, T. Bækkegaard, N. T. Zinner
Different topological phases of quantum systems has become areas of increased focus in recent decades. In particular, the question of how to realize and manipulate systems with non…
Free-Fermion Multiply Excited Eigenstates and Their Experimental Signatures in 1D Arrays of Two-Level Atoms
Yu-Xiang Zhang, Klaus Mølmer
One-dimensional (1D) subwavelength atom arrays display multiply excited subradiant eigenstates which are reminiscent of free fermions. So far, these states have been associated wit…
Quantum Wheatstone Bridge
Kasper Poulsen, Alan C. Santos, Nikolaj T. Zinner
We propose a quantum Wheatstone bridge as a fully quantum analogue to the classical version. The bridge is a few-body boundary-driven spin chain exploiting quantum effects to gain…
Quantum Maxwell's Demon Assisted by Non-Markovian Effects
Kasper Poulsen, Marco Majland, Seth Lloyd +2
Maxwell's demon is the quintessential example of information control, which is necessary for designing quantum devices. In thermodynamics, the demon is an intelligent being who uti…
Active Frequency Measurement on Superradiant Strontium Clock Transitions
Yuan Zhang, Chongxin Shan, Klaus Mølmer
We develop a stochastic mean-field theory to describe active frequency measurements of pulsed superradiant emission, studied in recent experiments with strontium-87 atoms trapped i…
Application of the Diamond Gate in Quantum Fourier Transformations and Quantum Machine Learning
E. Bahnsen, S. E. Rasmussen, N. J. S. Loft +1
As we are approaching actual application of quantum technology, it is essential to exploit the current quantum resources in the best possible way. With this in mind, it might not b…
The superconducting circuit companion -- an introduction with worked examples
S. E. Rasmussen, K. S. Christensen, S. P. Pedersen +4
This tutorial aims at giving an introductory treatment of the circuit analysis of superconducting qubits, i.e., two-level systems in superconducting circuits. It also touches upon…
Entanglement-enhanced quantum rectification
Kasper Poulsen, Alan C. Santos, Lasse B. Kristensen +1
Quantum mechanics dictates the band-structure of materials that is essential for functional electronic components. With increased miniaturization of devices, it becomes possible to…
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…
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…
Simple implementation of high fidelity controlled-SWAP gates and quantum circuit exponentiation of non-Hermitian gates
S. E. Rasmussen, N. T. Zinner
The swap gate is an entangling swapping gate where the qubits obtain a phase of if the state of the qubits is swapped. Here we present a simple implementation of the control…
Quantum thermal transistor in superconducting circuits
Marco Majland, Kasper Sangild Christensen, Nikolaj Thomas Zinner
Logical devices based on electrical currents are ubiquitous in modern society. However, digital logic does have some drawbacks such as a relatively high power consumption. It is th…
Stable adiabatic quantum batteries
Alan C. Santos, Barış Çakmak, Steve Campbell +1
With the advent of quantum technologies comes the requirement of building quantum components able to store energy to be used whenever necessary, i.e. quantum batteries. In this pap…
State transfer in an inhomogeneous spin chain
Michael Iversen, Rafael Emilio Barfknecht, Angela Foerster +1
We present an analytical study of state transfer in a spin chain in the presence of an inhomogeneous set of exchange coefficients. We initially consider the homogeneous case and de…
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…
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…
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…
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…
Realization of efficient quantum gates with a superconducting qubit-qutrit circuit
T. Bækkegaard, L. B. Kristensen, N. J. S. Loft +3
Building a quantum computer is a daunting challenge since it requires good control but also good isolation from the environment to minimize decoherence. It is therefore important t…