Article
Nanoscience & Nanotechnology
M. Milivojevic
Summary: The study explores the possibility of determining the Rashba spin-orbit coupling strength in InSb nanowire quantum dots by measuring the magnetic susceptibility of the two-electron system in a double quantum dot. It is found that the magnetic susceptibility reaches a maximal value when the spin-orbit and magnetic field are parallel/antiparallel, which can be used to extract the value of the Rashba parameter.
PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES
(2021)
Article
Nanoscience & Nanotechnology
N. S. Maslova, P. I. Arseyev, I. M. Sokolov, V. N. Mantsevich
Summary: A protocol for entanglement formation between electronic spins in the system of interacting quantum dots and circular polarized cavity photons was proposed. The entangled states are formed due to the spin-orbit interaction in the system consisting of two different types of diamond-like spatially arranged quantum dots resonantly interacting with left and right circular polarized cavity fields. The time evolution of entanglement degree (concurrence) in the presence of interaction with fermionic reservoir and cavity leakage was obtained.
PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES
(2023)
Article
Chemistry, Multidisciplinary
T. S. Shamirzaev, A. V. Shumilin, D. S. Smirnov, D. Kudlacik, S. V. Nekrasov, Yu G. Kusrayev, D. R. Yakovlev, M. Bayer
Summary: This study investigated exciton recombination and spin dynamics in (In,Al)As/AlAs quantum dots with indirect band gap and type-I band alignment. The anisotropic exchange interaction in these quantum dots was found to be negligible, enabling the formation of spin-polarized bright excitons under quasi-resonant, circularly polarized excitation. The recombination and spin dynamics of excitons were controlled by the hyperfine interaction between the electron and nuclear spins. A kinetic model was developed to quantitatively describe the experimental data, taking into account the population dynamics of the bright and dark exciton states as well as the spin dynamics.
Article
Quantum Science & Technology
Anas Ait Chlih, Nabil Habiballah, Mostafa Nassik
Summary: The study focuses on the temporal evolution of quantum correlations in a two-qubit XXZ Heisenberg spin chain model with DM interaction and an external nonuniform magnetic field. Results show that the external magnetic field enhances the effect of intrinsic decoherence, leading to entanglement sudden death phenomenon.
QUANTUM INFORMATION PROCESSING
(2021)
Article
Multidisciplinary Sciences
J. Yoneda, W. Huang, M. Feng, C. H. Yang, K. W. Chan, T. Tanttu, W. Gilbert, R. C. C. Leon, F. E. Hudson, K. M. Itoh, A. Morello, S. D. Bartlett, A. Laucht, A. Saraiva, A. S. Dzurak
Summary: The article demonstrates high-fidelity coherent transport of an electron spin qubit between quantum dots in isotopically-enriched silicon, with a reported polarization transfer fidelity of 99.97% and an average coherent transfer fidelity of 99.4%. The results suggest that this method can reduce the cost of fault-tolerant quantum processors and provide key elements for high-fidelity, on-chip quantum information distribution.
NATURE COMMUNICATIONS
(2021)
Article
Physics, Multidisciplinary
Chuyao Tong, Annika Kurzmann, Rebekka Garreis, Wei Wister Huang, Samuel Jele, Marius Eich, Lev Ginzburg, Christopher Mittag, Kenji Watanabe, Takashi Taniguchi, Klaus Ensslin, Thomas Ihn
Summary: The study reports experiments on coupled bilayer graphene double quantum dots, where the spin and valley states are precisely controlled, enabling the observation of two-electron combined blockade physics. The switching of selection rules is demonstrated by switching between different ground states with gate and magnetic-field tuning, showing either valley blockade or spin blockade depending on the ground state configuration.
PHYSICAL REVIEW LETTERS
(2022)
Article
Quantum Science & Technology
Qing-long Tian, You-neng Guo, Xiang-jun Chen, Shi-feng Wang
Summary: Quantum correlations dynamics in a tripartite system are studied in this paper. It is found that the magnetic field, anisotropic coupling coefficient, and DM interaction parameter are effective control parameters for generating and enhancing quantum correlations. Furthermore, the study reveals that the dynamics of tripartite quantum correlations depend on the input configuration of initial states and are more robust against intrinsic decoherence when quantified by D-(3).
QUANTUM INFORMATION PROCESSING
(2023)
Article
Physics, Applied
Kin On Ho, Man Yin Leung, P. Reddy, Jianyu Xie, King Cho Wong, Yaxin Jiang, Wei Zhang, King Yau Yip, Wai Kuen Leung, Yiu Yung Pang, King Yiu Yu, Swee K. Goh, M. W. Doherty, Sen Yang
Summary: Understanding the wave function profile of a qubit is crucial for its quantum applications. This study investigates the hyperfine structure of negatively charged nitrogen-vacancy (N -V) centers in diamonds under pressure using strain dependence calculations and experimental data. The findings suggest that pressure can increase the electron spin density and cause rehybridization of bonds in N -V centers, which has implications for quantum information processing.
PHYSICAL REVIEW APPLIED
(2022)
Article
Materials Science, Multidisciplinary
Haoting Xu, Hae-Young Kee
Summary: We investigate a way to create entangled Majorana fermions in the spin -21 Kitaev chain with open boundary conditions. By applying a pair pulse sequence, we can promote long-distance spin correlations and obtain maximal bipartite entanglement entropy. Comparing with entangled Bell pairs, the Kitaev chain reaches maximal entanglement entropy faster due to the exclusion of zero modes. We also apply our results to the twisted Kitaev chain CoNb2O6 and discuss future directions.
Article
Optics
W. F. Balthazar, D. G. Braga, V. S. Lamego, M. H. M. Passos, J. A. O. Huguenin
Summary: The paper introduces an all-optical setup to generate various X states using spin-orbit modes and a high intensity laser beam. By simulating spin-orbit tomography, the researchers were able to reconstruct the density matrix and study discord and concurrence for different states, showing good agreement with theoretical predictions. Additionally, two different optical circuits were proposed for preparing the single-photon spin-orbit X state.
Article
Physics, Applied
S. Yamamoto, R. Kaji, H. Sasakura, S. Adachi
Summary: Experimental observations on nuclear spin polarization in quantum dots reveal that under a longitudinal magnetic field, there are three stable branches of nuclear spin polarization, contrary to the previous belief of at most two stable branches. The incorporation of electron spin relaxation due to nuclear spin fluctuation allows for the reproduction of observed features of nuclear spin polarization and electron spin polarization.
JAPANESE JOURNAL OF APPLIED PHYSICS
(2021)
Article
Chemistry, Multidisciplinary
William J. Pappas, Rugang Geng, Adrian Mena, Alexander J. Baldacchino, Amir Asadpoordarvish, Dane R. McCamey
Summary: Devices that exploit the quantum properties of organic materials have shown significant progress in quantum information processing and sensing. However, challenges remain in scaling these devices and maintaining reproducibility due to variations of quantum properties within and between devices. This research provides the first 2D map of the hyperfine spin property in traditional organic light-emitting diodes (OLEDs) using spatially resolved magnetoluminescence. The study reveals high intra-device variabilities and spatial correlation, highlighting the implications for the reproducibility and integration of organic quantum devices.
ADVANCED MATERIALS
(2022)
Review
Energy & Fuels
Norazuwana Shaari, Siti Kartom Kamarudin, Raihana Bahru
Summary: Carbon quantum dots (CQDs) and graphene quantum dots (GQDs) are frequently mentioned in recent studies for their unique potential in electrical, optical, and optoelectrical properties. They are highly stable due to their carbon material and environmentally friendly nature. Various production methods and additive materials can enhance their performance, with shapes and sizes influenced by different parameters. Applications in fuel cell technology have shown improved performance.
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
(2021)
Article
Spectroscopy
Xiaojuan Wang, Zhixiong Zhang, Zhenzhen Liu, Xiqi Ma, Qi Dai, Xiaoqiang Wang, Baosheng Ge, Hua He, Fang Huang
Summary: This study systematically investigated the interactions between ultrasmall graphene quantum dots (GQDs) and biomacromolecules using carbonic anhydrase (CA) as a model protein. The results showed that GQDs could quench the intrinsic fluorescence of CA in a static binding mode driven by van der Waal interactions and hydrogen bonding. Additionally, the binding of GQDs induced slight conformational changes of CA and resulted in the reduction of its biological functions.
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
(2022)
Article
Chemistry, Multidisciplinary
Selena J. Lockyer, Alessandro Chiesa, Adam Brookfield, Grigore A. Timco, George F. S. Whitehead, Eric J. L. McInnes, Stefano Carretta, Richard E. P. Winpenny
Summary: This study presents a supramolecule with two different types of spins and interaction energies. The interaction energies are confirmed using electron paramagnetic resonance (EPR) spectroscopy. Based on the measured parameters, the supramolecule is suggested for simulating quantum decoherence in maximally entangled Bell states that can be used for quantum teleportation.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2022)
Correction
Physics, Multidisciplinary
Florian Geissler, J. C. Budich, Bjoern Trauzettel
NEW JOURNAL OF PHYSICS
(2015)
Article
Materials Science, Multidisciplinary
Florian Geissler, Francois Crepin, Bjoern Trauzettel
Article
Materials Science, Multidisciplinary
Moritz Fuchs, Felix Krauss, Daniel Hetterich, Bjoern Trauzettel
Article
Physics, Multidisciplinary
A. Amaricci, J. C. Budich, M. Capone, B. Trauzettel, G. Sangiovanni
PHYSICAL REVIEW LETTERS
(2015)
Article
Physics, Multidisciplinary
N. Traverso Ziani, C. Fleckenstein, F. Crepin, B. Trauzettel
Article
Nanoscience & Nanotechnology
F. Crepin, B. Trauzettel
PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES
(2016)
Reprint
Nanoscience & Nanotechnology
F. Crepin, B. Trauzettel
PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES
(2016)
Article
Physics, Multidisciplinary
S. Gattenlohner, I. V. Gornyi, P. M. Ostrovsky, B. Trauzettel, A. D. Mirlin, M. Titov
PHYSICAL REVIEW LETTERS
(2016)
Article
Chemistry, Multidisciplinary
Lucia Vigliotti, Alessio Calzona, Niccolo Traverso Ziani, F. Sebastian Bergeret, Maura Sassetti, Bjoern Trauzettel
Summary: Josephson junctions in the presence of a magnetic field can exhibit different interference patterns based on the spatial distribution of the supercurrent. In this study, a topological Josephson junction is investigated with extended edge states. It is found that the interference pattern, driven by dominant crossed Andreev reflections and overlapped edge states, approaches a periodicity of 2 phi(0).
Article
Physics, Multidisciplinary
Aritra Lahiri, Sang -Jun Choi, Bjoern Trauzettel
Summary: Josephson tunnel junctions exhibit a supercurrent proportional to the sine of the superconducting phase difference. Voltage pulses with sharp temporal variations significantly influence the term proportional to the cosine of the phase difference. The nonequilibrium fractional Josephson effect arises from the interference of nonequilibrium virtual quasiparticle excitations, and it is independent of the ground state fermion parity in topological Josephson junctions.
PHYSICAL REVIEW LETTERS
(2023)
Article
Optics
Michael Krebsbach, Bjoern Trauzettel, Alessio Calzona
Summary: This study provides an in-depth analysis of the relevant parameters of Richardson extrapolation and proposes an optimized protocol for its implementation. It allows for precise control of statistical uncertainty and shows a significant improvement in error mitigation performance.
Article
Materials Science, Multidisciplinary
C. Fleckenstein, N. Traverso Ziani, B. Trauzettel
Article
Materials Science, Multidisciplinary
C. De Beule, N. Traverso Ziani, M. Zarenia, B. Partoens, B. Trauzettel
Article
Materials Science, Multidisciplinary
Maxim Kharitonov, Stefan Juergens, Bjoern Trauzettel
Article
Materials Science, Multidisciplinary
A. Amaricci, J. C. Budich, M. Capone, B. Trauzettel, G. Sangiovanni