53 citations · 215 across the 13 of their papers we have counts for
11 papers
Sideband thermometry of ion crystals
Ivan Vybornyi, Laura S. Dreissen, Dominik Kiesenhofer +7
Coulomb crystals of cold trapped ions are a leading platform for the realisation of quantum processors and quantum simulations and, in quantum metrology, for the construction of op…
Controlling two-dimensional Coulomb crystals of more than 100 ions in a monolithic radio-frequency trap
Dominik Kiesenhofer, Helene Hainzer, Artem Zhdanov +4
Linear strings of trapped atomic ions held in radio-frequency (rf) traps constitute one of the leading platforms for quantum simulation experiments, allowing for the investigation…
Topological Superfluid Defects with Discrete Point Group Symmetries
Y. Xiao, M. O. Borgh, A. A. Blinova +3
Discrete symmetries are spatially ubiquitous but are often hidden in internal states of systems where they can have especially profound consequences. In this work we create and ver…
Correlation spectroscopy with multi-qubit-enhanced phase estimation
H. Hainzer, D. Kiesenhofer, T. Ollikainen +7
Ramsey interferometry is a widely used tool for precisely measuring transition frequencies between two energy levels of a quantum system, with applications in time-keeping, precisi…
Controlled creation of a singular spinor vortex by circumventing the Dirac belt trick
L. S. Weiss, M. O. Borgh, A. Blinova +4
Persistent topological defects and textures are particularly dramatic consequences of superfluidity. Among the most fascinating examples are the singular vortices arising from the…
Decay of a Quantum Knot
T. Ollikainen, A. Blinova, M. Möttönen +1
We experimentally study the dynamics of quantum knots in a uniform magnetic field in spin-1 Bose-Einstein condensates. The knot is created in the polar magnetic phase, which rapidl…
Three-dimensional skyrmions in spin-2 Bose-Einstein condensates
K. Tiurev, T. Ollikainen, P. Kuopanportti +3
We introduce topologically stable three-dimensional skyrmions in the cyclic and biaxial nematic phases of a spin-2 Bose-Einstein condensate. These skyrmions exhibit exceptionally h…
Quantum knots in Bose-Einstein condensates created by counterdiabatic control
T. Ollikainen, S. Masuda, M. Möttönen +1
We theoretically study the creation of knot structures in the polar phase of spin-1 BECs using the counterdiabatic protocol in an unusual fashion. We provide an analytic solution t…
Quantum Gates for Propagating Microwave Photons
Roope Kokkoniemi, Tuomas Ollikainen, Russell E. Lake +6
We report a generic scheme to implement transmission-type quantum gates for propagating microwave photons, based on a sequence of lumped-element components on transmission lines. B…
Counter-diabatic vortex pump in spinor Bose-Einstein condensates
T. Ollikainen, S. Masuda, M. Möttönen +1
Topological phase imprinting is a well-established technique for deterministic vortex creation in spinor Bose-Einstein condensates of alkali metal atoms. It was recently shown that…
Creation and dynamics of two-dimensional skyrmions in antiferromagnetic spin-1 Bose-Einstein condensates
T. Ollikainen, E. Ruokokoski, M. Möttönen
We numerically simulate the creation process of two-dimensional skyrmionic excitations in antiferromagnetic spin-1 Bose--Einstein condensates by solving the full three-dimensional…