Article
Optics
Andrea Richaud, Vittorio Penna, Alexander L. Fetter
Summary: The study focuses on the massive point-vortex model with small cores of a different species in two dimensions. By deriving the relevant Lagrangian and conducting detailed numerical analysis, it is found that radial oscillations and inertial effects can occur in these vortices.
Article
Optics
Nataliia Bazhan, Anton Svetlichnyi, Dominik Pfeiffer, Daniel Derr, Gerhard Birkl, Alexander Yakimenko
Summary: This article discusses the significance of coupled coaxially stacked toroidal condensates with persistent currents for studying interacting superflows. It proposes experimentally accessible methods to prepare states with different topological charges in two coupled coaxial ring-shaped atomic Bose-Einstein condensates. The results open up possibilities for directly observing rotational Josephson vortices in atomic Bose-Einstein condensates.
Article
Multidisciplinary Sciences
Thomas Easton, Marios Kokmotos, Giovanni Barontini
Summary: We numerically study the formation of vortex clusters in trapped Bose-Einstein condensates where vortices are initially imprinted in a line. We show that such a system exhibits a rich phenomenology depending on the distance at which the vortices are imprinted and their number. Our work sets the stage for possible experimental implementations where the formation of vortex clusters and more exotic bound states of vortices could be observed.
SCIENTIFIC REPORTS
(2023)
Article
Physics, Multidisciplinary
Samuel N. Alperin, Natalia G. Berloff
Summary: This paper investigates a generic mechanism of breather formation by simultaneously driving a polariton condensate with both nonresonant and nth order resonant pump frequencies. It constructs a family of exotic breathers with nontrivial discrete order of rotational symmetry for the second order resonance. Furthermore, it demonstrates the spontaneous emergence of crystalline and glassy orderings of lattices of polygonal breathers, depending on the degree of polygonal excitations at the lattice sites.
PHYSICAL REVIEW LETTERS
(2022)
Article
Materials Science, Multidisciplinary
Ekaterina Aladinskaia, Roman Cherbunin, Evgeny Sedov, Alexey Liubomirov, Kirill Kavokin, Evgeny Khramtsov, Mikhail Petrov, P. G. Savvidis, Alexey Kavokin
Summary: This study investigates the formation of exciton-polariton condensates in potlike traps created by optical pumping in a planar microcavity with embedded quantum wells. The experiment reveals the discrete spectrum of polariton eigenstates and demonstrates the control of these states through manipulating the shape and size of the trap and the spatial density distribution of the exciton reservoir.
Article
Mathematics, Applied
Yujin Guo, Yong Luo, Shuangjie Peng
Summary: In this paper, we study the ground states of two-dimensional Bose-Einstein condensates with repulsive or attractive interactions in a rotating trap. We analyze the existence and nonexistence of ground states for different parameters and classify the critical case where the rotation velocity is equal to the critical velocity. Furthermore, for a specific class of traps, we prove that the ground states must be real valued, unique, and free of vortices as the rotation velocity approaches zero.
SIAM JOURNAL ON MATHEMATICAL ANALYSIS
(2023)
Article
Mathematics, Interdisciplinary Applications
Hao Zhu, Wen-Kai Bai, Jun-Hui Zheng, Yan-Mei Yu, Lin Zhuang, Wu-Ming Liu
Summary: In this work, the phase transition analysis of binary Bose-Einstein condensates (BECs) with spin-orbit and Rabi couplings in a quasi-two-dimensional system under rotation is presented. The superfluid properties induced by rotation and spin-orbit coupling are investigated using hydrodynamic theory. The study reveals first-order phase transitions and continuous changes in angular momentum. A phase diagram showing the boundary regime in the plane of spin-orbit and Rabi coupling strengths is obtained.
CHAOS SOLITONS & FRACTALS
(2023)
Article
Mathematics, Applied
Yujin Guo
Summary: This paper investigates the ground states of rotating Bose-Einstein condensates with attractive interactions in non-radially harmonic traps. The authors analyze the asymptotic expansions of the ground states as the critical constant approaches a certain value, showing the visible effect of the rotational velocity on the ground states. Furthermore, it is proven that the ground states do not have any vortex in a specific region.
JOURNAL DE MATHEMATIQUES PURES ET APPLIQUEES
(2023)
Article
Physics, Multidisciplinary
Jin-Ling Wang, Wen Wen, Ji Lin, Hui-Jun Li
Summary: We propose a scheme to generate and control supersonic shock waves in a non-resonantly incoherent pumped exciton-polariton condensate, and different types of shock waves can be generated by regulating the incoherent pump. The ranges of parameters about various shock waves are determined by the initial incidence function and the cross-interaction between the polariton condensate and the reservoir. Our proposal not only discusses the shock wave in the exciton-polariton condensate system with the repulsive self-interaction, but also finds the shock wave in the condensates system with attractive self-interaction.
CHINESE PHYSICS LETTERS
(2023)
Article
Optics
Samuel N. Alperin, Natalia G. Berloff
Summary: Researchers have found that the intrinsic particle flux in a photonic Bose-Einstein condensate can stabilize multiply charged vortex states and spontaneously form through dynamic symmetry breaking mechanisms during condensate formation. The vortex states are found to radiate acoustically at topologically quantized frequencies and are limited by a quantum Kelvin-Helmholtz instability. This represents a fundamental result in fluid dynamics for quantum photonic fluids.
Article
Optics
Matthew Edmonds
Summary: The study focuses on a gas of atomic bosons confined in an elliptical harmonic trap, forming a quasi-two-dimensional atomic Bose-Einstein condensate subjected to a density-dependent gauge potential. Through exact Thomas-Fermi solutions and numerical simulations, the stable regimes and effects of rigid body and density-angular-momentum coupling are identified in the elliptically confined condensate. Varying the strength of the gauge potential and trap anisotropy showcases the emergence of superfluid states in different experimentally accessible geometries, with dense vortex lattices and concentric vortex ring arrangements observed for large rotation strengths.
Article
Physics, Condensed Matter
T. Mithun, A. R. Fritsch, I. B. Spielman, P. G. Kevrekidis
Summary: This paper revisits the topic of stationary and propagating solitonic excitations in self-repulsive three-dimensional (3D) Bose-Einstein condensates by quantitatively comparing theoretical analysis, numerical computations, and experimental results. Through fully 3D numerical simulations, the existence, stability, and dynamics of planar dark solitons are explored, along with the instability-induced decay products such as solitonic vortices and vortex rings.
JOURNAL OF PHYSICS-CONDENSED MATTER
(2023)
Article
Optics
G. D. Telles, P. E. S. Tavares, A. R. Fritsch, A. Cidrim, V. S. Bagnato
Summary: This study reports the observation of twisted decay of quadruply charged vortices in an atomic Bose-Einstein condensate. Numerical simulations confirm that singly-charged vortices resulting from the decay exhibit twisted, helical Kelvin waves.
LASER PHYSICS LETTERS
(2022)
Article
Optics
S. Matveenko, M. S. Bahovadinov, M. A. Baranov, G. Shlyapnikov
Summary: We discuss the finite-temperature damping of rotons in elongated Bose-condensed dipolar gases in the Thomas-Fermi regime in the tightly confined directions. The presence of multiple branches of excitations is crucial for the Landau damping and results in a significant increase in the damping rate. However, even rotons with energies close to the roton gap remain relatively stable in systems with a roton gap as small as 1 nK.
Article
Physics, Applied
M. Arivazhagan, P. Muruganandam, N. Athavan
Summary: We studied the generation of vortices in rotating Bose-Einstein condensates in a toroidal trap by varying trap parameters such as laser beam waist and Gaussian potential depth. Numerical solutions of the time-dependent Gross-Pitaevskii equation revealed changes in vortex structure and a significant increase in vortex numbers when the waist of the laser beam matched the area of the condensate. The number of vortices varied with the ratio of the root-mean-square radius of the condensate to the laser beam waist, reaching a maximum value at a ratio close to 0.7. Larger beam waist and deeper Gaussian potentials generated more vortices. The calculated number of vortices using the Feynman rule with Thomas Fermi approximation was consistent with the numerical results.
PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS
(2023)
Article
Physics, Condensed Matter
V Lahtinen, M. Mottonen
JOURNAL OF PHYSICS-CONDENSED MATTER
(2020)
Article
Nanoscience & Nanotechnology
Jinli Zhang, Tianyi Li, Roope Kokkoniemi, Chengyu Yan, Wei Liu, Matti Partanen, Kuan Yen Tan, Ming He, Lu Ji, Leif Gronberg, Mikko Mottonen
Article
Multidisciplinary Sciences
R. Kokkoniemi, J. -P. Girard, D. Hazra, A. Laitinen, J. Govenius, R. E. Lake, I. Sallinen, V. Vesterinen, M. Partanen, J. Y. Tan, K. W. Chan, K. Y. Tan, P. Hakonen, M. Mottonen
Editorial Material
Quantum Science & Technology
Markku Rasanen, Henrikki Makynen, Mikko Mottonen, Jan Goetz
Summary: Quantum computing has the potential to bring great economic prosperity to the European Union, but creating successful businesses in this field is challenging due to the required investments and infrastructure. The EU is making efforts to foster the quantum-computing ecosystem, proposing concrete actions for future growth and suggesting the creation of EU-based quantum-computing unicorns to drive technology and commercialization. These unicorns may serve as key points in pushing forward global policies and distinguishing the EU quantum ecosystem from others.
EPJ QUANTUM TECHNOLOGY
(2021)
Article
Engineering, Electrical & Electronic
Chengyu Yan, Juha Hassel, Visa Vesterinen, Jinli Zhang, Joni Ikonen, Leif Gronberg, Jan Goetz, Mikko Mottonen
Summary: The study presents an on-chip device based on a Josephson junction capable of coherent microwave emission, meeting the requirements for quantum-coherent operations. The characteristics of the device adhere to a perturbative theory based on a capacitively shunted Josephson junction, with low phase noise from the cryogenic microwave source resulting in infidelity lower than that caused by dephasing in superconducting qubits.
NATURE ELECTRONICS
(2021)
Article
Physics, Applied
Tasio Gonzalez-Raya, Mateo Casariego, Florian Fesquet, Michael Renger, Vahid Salari, Mikko Mottonen, Yasser Omar, Frank Deppe, Kirill G. Fedorov, Mikel Sanz
Summary: Microwave technology plays a crucial role in wireless communications, and understanding its limitations in realistic open-air settings is important for its development. This study investigates the feasibility of open-air entanglement distribution with microwave two-mode squeezed states and explores techniques to improve quantum correlations and increase the reach of entanglement.
PHYSICAL REVIEW APPLIED
(2022)
Article
Physics, Multidisciplinary
Toni Annala, Roberto Zamora-Zamora, Mikko Mottonen
Summary: This study presents research on topological knots and linked structures, constructs topologically protected links that cannot be untied through local reconnections, and proposes a classification scheme for topological vortex links.
COMMUNICATIONS PHYSICS
(2022)
Article
Instruments & Instrumentation
J. -P. Girard, R. E. Lake, W. Liu, R. Kokkoniemi, E. Visakorpi, J. Govenius, M. Mottonen
Summary: Recently, progress has been made in ultrasensitive microwave detectors, but their range of applications is limited due to a lack of compatibility with broad-band metrologically traceable power absorption measurements. In this study, an ultralow-noise nanobolometer with an additional dc heater input was used to make such measurements. The power absorption was traced by comparing the bolometer response between radio frequency and dc-heating powers traced to the Josephson voltage and quantum Hall resistance. The ability to accurately measure the attenuation of a coaxial input line between 50 MHz and 7 GHz with an uncertainty down to 0.1 dB at a typical input power of -114 dBm was demonstrated.
REVIEW OF SCIENTIFIC INSTRUMENTS
(2023)
Review
Quantum Science & Technology
Mateo Casariego, Emmanuel Zambrini Cruzeiro, Stefano Gherardini, Tasio Gonzalez-Raya, Rui Andre, Goncalo Frazao, Giacomo Catto, Mikko Moettoenen, Debopam Datta, Klaara Viisanen, Joonas Govenius, Mika Prunnila, Kimmo Tuominen, Maximilian Reichert, Michael Renger, Kirill G. Fedorov, Frank Deppe, Harriet van der Vliet, A. J. Matthews, Yolanda Fernandez, R. Assouly, R. Dassonneville, B. Huard, Mikel Sanz, Yasser Omar
Summary: The field of propagating quantum microwaves is gaining attention for its promising technological applications in communication and sensing. Despite similarities with quantum optics, the development of a controllable quantum microwave interface is still in its early stages. This article argues for the need of a fully operative toolbox for propagating quantum microwaves, and explores novel directions of research such as microwave quantum key distribution, quantum radar, bath-system learning, and direct dark matter detection. It serves as both a review of the state-of-the-art and an illustration of the wide range of applications that quantum microwaves can offer in the future.
QUANTUM SCIENCE AND TECHNOLOGY
(2023)
Article
Physics, Multidisciplinary
Toni Annala, Mikko Mottonen
Summary: This paper focuses on topological defects in mean-field-theory treatments of physical systems. The ambiguity and addition of topological charges are investigated using the mathematical formalism of covering spaces, clarifying many aspects of these phenomena. Topological-defect configurations consisting of several monopoles and unknotted ring defects are classified in terms of homotopy groups and fundamental-group actions, generalizing previous classifications. The decay of multiply charged topological monopoles under small perturbations and the conditions for their splitting into singly charged monopoles are analyzed.
PHYSICAL REVIEW RESEARCH
(2022)
Article
Materials Science, Multidisciplinary
Vasilii Vadimov, Jani Tuorila, Tuure Orell, Juergen Stockburger, Tapio Ala-Nissila, Joachim Ankerhold, Mikko Mottonen
Summary: The research compared the applicability of different master equations in the case of resonant qubits transversely coupled to a Drude-cut ohmic bath, finding that weak-coupling methods have significant limitations in practical applications, requiring careful choice of modeling methods to ensure accuracy.
Article
Physics, Multidisciplinary
V. Vadimov, T. Hyart, J. L. Lado, M. Mottonen, T. Ala-Nissila
Summary: In this study, zero modes emerge in a many-body system without gauge symmetry breaking and in the absence of superconducting order, showing that robust Majorana-like zero modes may appear in a many-body system with no single-particle analogs.
PHYSICAL REVIEW RESEARCH
(2021)
Article
Physics, Multidisciplinary
Vasilii Vadimov, Tapio Ala-Nissila, Mikko Mottonen
PHYSICAL REVIEW RESEARCH
(2020)
Article
Physics, Multidisciplinary
S. Alipour, A. T. Rezakhani, A. P. Babu, K. Molmer, M. Mottonen, T. Ala-Nissila
Article
Materials Science, Multidisciplinary
Hao Hsu, Matti Silveri, Andras Gunyho, Jan Goetz, Gianluigi Catelani, Mikko Mottonen
