Article
Optics
Artur Niezgoda, Jan Chwedenczuk, Tomasz Wasak, Francesco Piazza
Summary: In this study, a hybrid system of matter and light is considered as a sensing device, quantifying the role of cooperative effects. It is shown that modifications of the effective light-matter coupling constant can be measured with enhanced precision. The study also demonstrates the ultimate bound for the precision and how it scales with the number of qubits and photons, as well as the potential application for detecting gravitational acceleration using a Bose-Einstein condensate trapped in an optical cavity.
Article
Astronomy & Astrophysics
Yuuki Sugiyama, Akira Matsumura, Kazuhiro Yamamoto
Summary: The Bose-Marletto-Vedral experiment proposes a method for testing the quantum nature of gravity, sparking controversy on the relationship between entanglement due to Newtonian gravity, the essence of quantum gravity, and the existence of gravitons. Based on covariant quantum electrodynamics, a formula for the entanglement negativity of charged particles is derived, showing that entanglement generation is suppressed by decoherence from vacuum fluctuations.
Article
Physics, Condensed Matter
Huanhuan Wang, Xiangde Zhu, Zheng Chen, Fangjun Lu, Huijie Li, Yuyan Han, Liang Li, Wenshuai Gao, Wei Ning, Mingliang Tian
Summary: The study presents systematic electrical transport studies on unstrained layered SrIn2P2 single crystals, revealing weak localization of charge carriers at low temperatures due to strong quantum coherence. Further analysis suggests that the electron-phonon interaction dominates the phase decoherence process. Additionally, Hall measurements indicate that transport properties are mainly dominated by hole-type carriers, with weak localization being significantly affected by carrier transport.
JOURNAL OF PHYSICS-CONDENSED MATTER
(2021)
Article
Nanoscience & Nanotechnology
Florian N. M. Froning, Leon C. Camenzind, Orson A. H. van der Molen, Ang Li, Erik P. A. M. Bakkers, Dominik M. Zumbuehl, Floris R. Braakman
Summary: Quantum computers promise to execute complex tasks exponentially faster than classical computers, but require fast and selective control of individual qubits while maintaining coherence. Operating a hole spin qubit in a Ge/Si nanowire all-electrically demonstrates the principle of switching between fast control and increased coherence.
NATURE NANOTECHNOLOGY
(2021)
Article
Physics, Applied
J. A. Potter, J. C. Fenton, P. A. Warburton
Summary: This study demonstrates that the two major barriers of quantum phase slip (QPS) have been overcome, including establishing stable nanowire fabrication methods and controlling the QPS process. The experimental results show that the NbN coplanar-waveguide (CPW) resonators embedded with nanowires fabricated using a neon focused ion beam have a higher internal quality factor and tunable frequency with an applied magnetic field that reveals tunneling of the order parameter at half-integer flux. The adiabatic order parameter tunneling observed in this study demonstrates improved control over energy dissipation in nanowire QPS circuits, highlighting a promising pathway towards low-loss nanowire-based QPS devices.
PHYSICAL REVIEW APPLIED
(2023)
Article
Materials Science, Multidisciplinary
F. A. Calderon-Vargas, Edwin Barnes, Sophia E. Economou
Summary: This paper studies the flip-flop qubit encoded in silicon with antiparallel donor-bound electron and donor nuclear spins. Analytical effective two-level Hamiltonians with and without periodic driving are derived, and an optimal control scheme is proposed to generate fast and robust single-qubit gates in the presence of low-frequency noise. This scheme significantly improves the qubit quality factor and relaxation time.
Article
Astronomy & Astrophysics
Z. Ge, T. Eronen, A. de Roubin, K. S. Tyrin, L. Canete, S. Geldhof, A. Jokinen, A. Kankainen, J. Kostensalo, J. Kotila, M. I. Krivoruchenko, I. D. Moore, D. A. Nesterenko, J. Suhonen, M. Vilen
Summary: A precise determination of the ground state In-111 (9/2(+)) electron capture to ground state of Cd-111 (1/2(+)) Qvalue has been performed using advanced measurement techniques. The results provide valuable information for potential low Q-value electron capture decays and neutrino-mass measurements.
Article
Multidisciplinary Sciences
Sergey Tomin, Evgeny Schneidmiller, Winfried Decking
Summary: Plasma and beam physics are typically classical disciplines, but there is a quantum effect called energy diffusion in an electron beam due to quantum fluctuations in undulator radiation that can affect the operation of these devices. This paper presents the first measurements of this quantum diffusion effect at the European X-Ray Free-Electron Laser, which are in good agreement with theoretical predictions.
SCIENTIFIC REPORTS
(2023)
Article
Multidisciplinary Sciences
Daniel B. Higginbottom, Alexander T. K. Kurkjian, Camille Chartrand, Moein Kazemi, Nicholas A. Brunelle, Evan R. MacQuarrie, James R. Klein, Nicholas R. Lee-Hone, Jakub Stacho, Myles Ruether, Camille Bowness, Laurent Bergeron, Adam DeAbreu, Stephen R. Harrigan, Joshua Kanaganayagam, Danica W. Marsden, Timothy S. Richards, Leea A. Stott, Sjoerd Roorda, Kevin J. Morse, Michael L. W. Thewalt, Stephanie Simmons
Summary: This work successfully achieved individually addressable and optically detectable photon-spin interfaces in silicon, providing opportunities for constructing integrated silicon-based quantum information networks in the telecommunications band.
Article
Multidisciplinary Sciences
George Gillard, Edmund Clarke, Evgeny A. Chekhovich
Summary: This study demonstrates millisecond coherence times for a nuclear spin ensemble coupled to a single electron spin qubit in a semiconductor quantum dot, providing new understanding of the many-body coherence in central spin systems required for the development of electron-nuclear spin qubits.
NATURE COMMUNICATIONS
(2022)
Article
Physics, Fluids & Plasmas
Alessandro Candeloro, Luca Razzoli, Paolo Bordone, Matteo G. A. Paris
Summary: Research using graph theory and Fisher information concept found that the topology of a system affects its temperature measurement performance, with low connectivity systems suitable for low temperatures and high connectivity systems suitable for high temperatures. The precision achievable by position measurement is compared to the optimal precision achievable through energy measurement.
Article
Chemistry, Multidisciplinary
Si-Guo Wu, Ze-Yu Ruan, Guo-Zhang Huang, Jie-Yu Zheng, Veacheslav Vieru, Gheorghe Taran, Jin Wang, Yan-Cong Chen, Jun-Liang Liu, Le Tuan Anh Ho, Liviu F. Chibotaru, Wolfgang Wernsdorfer, Xiao-Ming Chen, Ming-Liang Tong
Summary: Single-molecule magnets exhibit magnetization blocking with strong magnetic anisotropy, which can be modified through molecular engineering and highlighted by hyperfine coupling. Poor understanding of relaxation mechanisms limits the exploitation of nuclear-spin molecular qubits. This study demonstrates the field-dependent oscillation of magnetization blocking barrier in a holmium metallacrown magnet, driven by the switch of relaxation mechanism involving hyperfine interaction.
Article
Multidisciplinary Sciences
Quanwei Li, Kaydren Orcutt, Robert L. Cook, Javier Sabines-Chesterking, Ashley L. L. Tong, Gabriela S. Schlau-Cohen, Xiang Zhang, Graham R. Fleming, K. Birgitta Whaley
Summary: Experimental evidence shows that photosynthesis is initiated by single photons rather than intense light. It is discovered that the absorption of single photons can drive the energy transfer and fluorescence emission in photosynthesis, leading to the primary charge separation.
Review
Physics, Nuclear
Sergey Eliseev, Yuri Novikov
Summary: After decades of development, Penning-trap mass spectrometry has shown unprecedented precision and sensitivity in measuring the masses of various nuclides, which is of great significance for fundamental physics research.
EUROPEAN PHYSICAL JOURNAL A
(2023)
Article
Chemistry, Multidisciplinary
Molly P. Andersen, Evgeny Mikheev, Ilan T. Rosen, Lixuan Tai, Peng Zhang, Kang L. Wang, Marc A. Kastner, David Goldhaber-Gordon
Summary: The quantum coherence-driven universal conductance fluctuations in the topological material MnBi2Te4 thin film were studied. It was found that the conductance magnetofingerprint depends on the direction of the magnetic field sweep, which may be due to the motion and nucleation of magnetic domain walls.
Article
Chemistry, Multidisciplinary
Changxia Li, Wen Ju, Sudarshan Vijay, Janis Timoshenko, Kaiwen Mou, David A. Cullen, Jin Yang, Xingli Wang, Pradip Pachfule, Sven Bruckner, Hyo Sang Jeon, Felix T. Haase, Sze-Chun Tsang, Clara Rettenmaier, Karen Chan, Beatriz Roldan Cuenya, Arne Thomas, Peter Strasser
Summary: In this work, a set of covalent organic framework (COF)-derived Ni-N-C catalysts were prepared and the Ni-N-x content was adjusted. The existence of single-site Ni-N motifs was confirmed by microscopy and X-ray techniques, and the relationship between active site density and turnover frequency was discussed.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2022)
Article
Chemistry, Physical
Uta Hejral, Janis Timoshenko, David Kordus, Mauricio Lopez Luna, Nuria J. Divins, Simon Widrinna, Ioannis Zegkinoglou, Lukas Pielsticker, Hemma Mistry, Jorge Anibal Boscoboinik, Stefanie Kuehl, Beatriz Roldan Cuenya
Summary: This study investigated the catalytic mechanism of NiGa alloys in CO2 hydrogenation. It was found that Ni3Ga1 and Ni5Ga3 nanoparticles formed different phases at different temperatures under H-2 activation. Under CO2 hydrogenation conditions, Ga partially oxidized to form Ga2O3. The Ni3Ga1 NPs showed high selectivity towards methane production, while the Ni5Ga3 NPs exhibited high selectivity towards methanol production, which was attributed to the presence of the S-Ni5Ga3 phase.
JOURNAL OF CATALYSIS
(2022)
Editorial Material
Nanoscience & Nanotechnology
Vyacheslavs Kashcheyevs
NATURE NANOTECHNOLOGY
(2022)
Article
Physics, Condensed Matter
Eugene A. Kotomin, Alexei Kuzmin, Juris Purans, Janis Timoshenko, Sergei Piskunov, Rotraut Merkle, Joachim Maier
Summary: A comparative study of isoelectronic CaFeO3 and SrFeO3 perovskites was conducted using ab initio quantum chemical calculations and X-ray absorption spectroscopy. Results showed agreement with previous findings, supporting a cubic structure for SrFeO3 and a transition from orthorhombic to monoclinic structure in CaFeO3. Discussions on local atomic and magnetic structures, as well as electronic properties, were presented in detail.
PHYSICA STATUS SOLIDI B-BASIC SOLID STATE PHYSICS
(2022)
Article
Physics, Condensed Matter
Martins Zubkins, Janis Timoshenko, Jevgenijs Gabrusenoks, Kaspars Pudzs, Andris Azens, Qin Wang, Juris Purans
Summary: This study discusses the local atomic structure and electrical properties of Zn-Ir-O films with high iridium concentration. It is found that the Zn-O interatomic distance and disorder factor increase with iridium concentration. In addition, heating the substrate during deposition helps preserve the nano-crystalline w-ZnO structure, and a transition from n- to p-type conductivity is observed at low iridium concentrations regardless of substrate temperature.
PHYSICA STATUS SOLIDI B-BASIC SOLID STATE PHYSICS
(2022)
Article
Chemistry, Multidisciplinary
Huimin Liu, Xiuyao Lang, Chao Zhu, Janis Timoshenko, Martina Ruescher, Lichen Bai, Nestor Guijarro, Haibo Yin, Yue Peng, Junhua Li, Zheng Liu, Weichao Wang, Beatriz Roldan Cuenya, Jingshan Luo
Summary: This study demonstrates a novel electrocatalyst for the electrochemical nitrate reduction reaction (NITRR), which can efficiently produce ammonia with high efficiency. The synergistic catalytic cooperation between Rh and Cu sites enables high activity and high yield of ammonia production.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2022)
Article
Chemistry, Physical
Janis Timoshenko, Arno Bergmann, Clara Rettenmaier, Antonia Herzog, Rosa M. Aran-Ais, Hyo Sang Jeon, Felix T. Haase, Uta Hejral, Philipp Grosse, Stefanie Kuehl, Earl M. Davis, Jing Tian, Olaf Magnussen, Beatriz Roldan Cuenya
Summary: This study reveals the complexity of CO2RR catalysts under dynamic reaction conditions using operando X-ray absorption and X-ray diffraction methods. By employing a pulsed reaction protocol, the effect of copper species on product distribution is decoupled, resulting in an increase in ethanol production.
Article
Physics, Multidisciplinary
M. Kokainis, K. Prusis, J. Vihrovs, V Kashcheyevs, A. Ambainis
Summary: We demonstrate that discrete time quantum walk on the Boolean hypercube of dimension n exhibits strong dispersion property, making it interesting for algorithmic applications requiring fast dispersion over the state space.
JOURNAL OF PHYSICS A-MATHEMATICAL AND THEORETICAL
(2022)
Article
Chemistry, Multidisciplinary
David Kordus, Jelena Jelic, Mauricio Lopez Luna, Nuria J. Divins, Janis Timoshenko, See Wee Chee, Clara Rettenmaier, Jutta Kroehnert, Stefanie Kuehl, Annette Trunschke, Robert Schloegl, Felix Studt, Beatriz Roldan Cuenya
Summary: The surface composition and catalyst structure of Cu/ZnO-based catalysts play a crucial role in the hydrogenation of CO2 to methanol. The study investigates the effect of pre-catalyst shape (cubic vs spherical) on the activity and selectivity of ZnO-supported Cu nanoparticles during methanol synthesis. Experimental techniques and density functional theory calculations were used to understand the changes in morphology and composition of the shaped pre-catalysts, as well as their subsequent transformation and activity/selectivity trends under reaction conditions.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2023)
Article
Chemistry, Physical
Huimin Liu, Janis Timoshenko, Lichen Bai, Qinye Li, Martina Ruscher, Chenghua Sun, Beatriz Roldan Cuenya, Jingshan Luo
Summary: In this study, rhodium nanoflowers (Rh NFs) were designed as catalysts to reduce the overpotential required for electrocatalytic nitrate reduction to ammonia (NITRR), achieving efficient ammonia synthesis.
Article
Chemistry, Multidisciplinary
Janis Timoshenko, Felix T. Haase, Sascha Saddeler, Martina Ruescher, Hyo Sang Jeon, Antonia Herzog, Uta Hejral, Arno Bergmann, Stephan Schulz, Beatriz Roldan Cuenya
Summary: By using operando quick X-ray absorption fine structure spectroscopy and unsupervised/supervised machine learning methods, we can unveil the real active species and active states in bimetallic transition-metal oxide catalysts. Through principal component analysis and artificial neural network analysis, we can track the evolution of tetrahedrally and octahedrally coordinated species and understand the chemical changes and phase transitions taking place in CoxFe3-xO4 catalysts.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2023)
Article
Materials Science, Multidisciplinary
Elina Pavlovska, Peter G. Silvestrov, Patrik Recher, Girts Barinovs, Vyacheslavs Kashcheyevs
Summary: This study investigates collisions between isolated electrons guided along the edges in quantum Hall setups, which mimic the mixing of photons. The researchers use a quadratic two-dimensional saddle point potential for the beam splitter and unscreened Coulomb interaction to model the electronic Hong-Ou-Mandel (HOM) experiment. A universal phase diagram is presented to describe the scattering outcomes of bunching and antibunching, and analytical estimates are given for conditions when classical dynamics dominate over quantum effects.
Article
Chemistry, Multidisciplinary
David Kordus, Jelena Jelic, Mauricio Lopez Luna, Nuria J. Divins, Janis Timoshenko, See Wee Chee, Clara Rettenmaier, Jutta Kroehnert, Stefanie Kuehl, Annette Trunschke, Robert Schloegl, Felix Studt, Beatriz Roldan Cuenya
Summary: The activity and selectivity of ZnO-supported Cu nanoparticles in the synthesis of methanol by CO2 hydrogenation were investigated with different pre-catalyst shapes (cubic vs spherical). The pre-catalyst structure was found to strongly influence its transformation and activity/selectivity trends during the reaction. Cubic Cu particles exhibited higher activity for methanol production, albeit with slightly reduced selectivity compared to similarly sized spherical particles. These findings were supported by density functional theory calculations.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2023)
Article
Materials Science, Multidisciplinary
Frank Hohls, Vyacheslavs Kashcheyevs, Friederike Stein, Tobias Wenz, Bernd Kaestner, Hans W. Schumacher
Summary: Single-electron pumps based on tunable-barrier quantum dots are promising candidates for realizing the unit ampere in the revised International System of Units (SI). They are simple to operate and show high precision at high operation frequencies. By employing a two-gate operation scheme, we verify the prediction of back-tunneling effects and demonstrate control of the back-tunneling error.
Article
Chemistry, Physical
Martina Ruescher, Antonia Herzog, Janis Timoshenko, Hyo Sang Jeon, Wiebke Frandsen, Stefanie Kuehl, Beatriz Roldan Cuenya
Summary: Copper-based catalysts are widely used for the electrocatalytic CO2 reduction reaction (CO2RR) to convert CO2 into valuable industrial chemicals. Bimetallic materials, such as ZnO/Cu2O nanocubes, show promising catalytic performance for CO2RR. In this study, operando spectroscopy and data analysis were used to investigate the chemical and structural changes of the catalysts under CO2RR conditions. It was found that the addition of Zn affects the kinetics of subsurface processes, while the Cu surface layer remains unchanged. The presence of Zn stabilizes cationic Cu(i) species and increases the selectivity towards C2+ products, while Zn-rich alloy phases promote the formation of CO and the parasitic hydrogen evolution reaction.
CATALYSIS SCIENCE & TECHNOLOGY
(2022)