Article
Quantum Science & Technology
Martin Nurizzo, Baptiste Jadot, Pierre-Andre Mortemousque, Vivien Thiney, Emmanuel Chanrion, David Niegemann, Matthieu Dartiailh, Arne Ludwig, Andreas D. Wieck, Christopher Baeuerle, Matias Urdampilleta, Tristan Meunier
Summary: We propose a protocol to achieve complete spin state readout of a two-electron system in a double quantum dot probed by an electrometer. This is done through repetitive single-shot measurements using Pauli spin blockade and our ability to tune the detuning and interdot tunnel coupling on fast timescales. By performing three distinct manipulations and measurements, we can determine if the spins are in the S, T0, T+, or T- state. This work addresses an important challenge of reducing the overhead for spin readout in scaling up spin-qubit platforms.
Article
Multidisciplinary Sciences
Runyu Lu, Kaipeng Liu, Yue Ban
Summary: This paper focuses on the robust control of a singlet-triplet qubit in a nanowire double quantum dot using inverse engineering and shortcuts to adiabaticity (STA). The optimization of STA with respect to systematic errors and the application of optimal control techniques are explored.
PHILOSOPHICAL TRANSACTIONS OF THE ROYAL SOCIETY A-MATHEMATICAL PHYSICAL AND ENGINEERING SCIENCES
(2022)
Article
Chemistry, Multidisciplinary
Ting Zhang, He Liu, Fei Gao, Gang Xu, Ke Wang, Xin Zhang, Gang Cao, Ting Wang, Jianjun Zhang, Xuedong Hu, Hai-Ou Li, Guo-Ping Guo
Summary: The study extracts the full g-tensor from strongly anisotropic leakage current in a double dot, revealing that the spin-orbit field is in-plane at an azimuthal angle of 59 degrees to the nanowire axis, indicating a strong spin-orbit interaction. The research demonstrates two different spin relaxation mechanisms for holes in Ge hut wire double dots, contributing to the feasibility of a Ge-based quantum processor.
Article
Physics, Applied
He Liu, Ting Zhang, Ke Wang, Fei Gao, Gang Xu, Xin Zhang, Shu-Xiao Li, Gang Cao, Ting Wang, Jianjun Zhang, Xuedong Hu, Hai-Ou Li, Guo-Ping Guo
Summary: Researchers have demonstrated a tunable spin-orbit interaction in a double quantum dot system in a germanium hut wire. This finding could enable fast spin manipulation and reduce decoherence, potentially leading to high-fidelity qubits in germanium hut wire systems.
PHYSICAL REVIEW APPLIED
(2022)
Article
Optics
Niels Heermeier, Tobias Heuser, Jan Grosse, Natalie Jung, Arsenty Kaganskiy, Markus Lindemann, Nils C. Gerhardt, Martin R. Hofmann, Stephan Reitzenstein
Summary: Spin-controlled lasers and high-beta quantum dot micropillar lasers are two fascinating photonic devices with potential applications. The experimental and predicted polarization oscillation frequencies of spin-laser effects are presented, demonstrating the possibility of developing more compact, faster, and more energy-efficient spin-lasers.
LASER & PHOTONICS REVIEWS
(2022)
Article
Multidisciplinary Sciences
Onuralp Karatum, Guncem Ozgun Eren, Rustamzhon Melikov, Asim Onal, Cleva W. Ow-Yang, Mehmet Sahin, Sedat Nizamoglu
Summary: This study demonstrates the development of heavy-metal-free quantum dot-based nano-heterojunction devices for capacitive photoresponse, paving the way towards safe and efficient next-generation photostimulation devices. By utilizing type-II band alignment and passivation of trap states, the photoinduced capacitive charge transfer is dominated at an optimum donor-acceptor ratio, showing a high photoluminescence quantum yield of 70%.
SCIENTIFIC REPORTS
(2021)
Article
Physics, Multidisciplinary
Yujun Zhang, Tsukasa Katayama, Akira Chikamatsu, Christian Schuessler-Langeheine, Niko Pontius, Yasuyuki Hirata, Kou Takubo, Kohei Yamagami, Keisuke Ikeda, Kohei Yamamoto, Tetsuya Hasegawa, Hiroki Wadati
Summary: Investigation of ultrafast dynamic behaviors can provide novel insights about the coupling mechanisms among multiple degrees of freedom in condensed matters. Here, the authors investigate a photo-induced antiferromagnetic-ferromagnetic transition in a strongly correlated thin film using time resolved X-ray based techniques, and observe unusual dynamic behaviors of the magnetism.
COMMUNICATIONS PHYSICS
(2022)
Article
Materials Science, Multidisciplinary
Patrycja Tulewicz, Kacper Wrzesniewski, Ireneusz Weymann
Summary: This study investigates the magnetoresistive properties of a spin valve based on a double quantum dot attached to ferromagnetic leads with noncollinear alignment of magnetic moments. The results show that the device can exhibit significant positive or inverse tunnel magnetoresistance and can serve as a source of highly spin-polarized current. Furthermore, the spin-resolved transport properties can be controlled by gate and bias voltages, as well as the angle between the magnetizations of the ferromagnets.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2022)
Article
Physics, Multidisciplinary
Fatima Rabea Al-Salhi, Amin Habbeb Al-Khursan
Summary: A model of EIG assisted by SGC in the ladder-plus-Y double quantum dot system is proposed, showing that transmission is enhanced by SGC presence and diffraction intensity can be increased by controlling phase. The system acquires huge diffraction intensity when the WL-QD field is high in the case of four coupling fields.
CHINESE JOURNAL OF PHYSICS
(2021)
Article
Physics, Multidisciplinary
Yanchao Zhang, Shuang Wang, Wanrong Li, Mingzhuang Yue
Summary: We investigate the thermoelectric transport and conversion of a parallel-coupled double quantum dot system, which consists of two capacitively coupled quantum dots in the Coulomb-blockade regime. We found that the system exhibits an unconventional thermoelectric conversion process induced by the inverse current effect, which is attributed to the increased Coulombic interaction between quantum dots, resulting in strong asymmetry in the system. We study the transport properties of steady-state particle current and heat current, and analyze the influence of Coulomb interaction on the thermodynamic characteristics of unconventional thermoelectric heat engines and refrigerators.
Article
Nanoscience & Nanotechnology
Heidi Potts, Markus Aspegren, Rousan Debbarma, Sebastian Lehmann, Claes Thelander
Summary: We investigate tunnel transport spectroscopy on a quantum dot molecule with a superconducting contact. The scattering between quantum dot spins and Bogoliubov quasiparticles leads to the formation of Yu-Shiba-Rusinov states within the superconducting gap. We find that the interaction between inter-dot spin-triplet state and the superconductor is stronger than the corresponding singlet, indicating stronger screening.
Article
Materials Science, Multidisciplinary
Bogdan R. Bulka
Summary: Exact analytical formulas for currents and current correlation functions in a Cooper pair splitter system are derived using Keldysh Green functions, with a focus on noise power spectrum behavior across bias voltage range. In the large voltage limit, shot noise dominates with spectrum exhibiting extraordinary side dips related to resonant interlevel current correlations. The study also shows perfect entanglement of split electrons in two separated crossed Andreev reflection processes.
Article
Chemistry, Multidisciplinary
Sven Dorsch, Artis Svilans, Martin Josefsson, Bahareh Goldozian, Mukesh Kumar, Claes Thelander, Andreas Wacker, Adam Burke
Summary: Studies on thermally induced transport in nanostructures explore the conversion of heat into electrical power, demonstrating the versatility of the design to study fluctuations and fundamental nanothermodynamics. By enhancing the temperature of the phonon bath near the double quantum dot, phonon-assisted transport is enabled while affecting conventional thermoelectric transport. The study shows sensitivity of phonon-assisted transport to excited states.
Article
Physics, Multidisciplinary
Vijay Bhatt, Surabhi Yadav, Pradip K. Jha, Aranya B. Bhattacherjee
Summary: The proposal suggests a scheme to generate strongly sub-Poissonian light through photon blockade in a photonic crystal nanocavity, achieving a second-order correlation function of around 10(-3) by utilizing a large chi ((2)) nonlinearity and optimizing the quantum dot and cavity detuning. This provides a highly tunable and efficient method for single photon source on demand, with potential applications in solid state based quantum information processing.
Article
Physics, Applied
Ting Zhang, Ke Wang, Fei Gao, He Liu, Xin Zhang, Gang Cao, Ting Wang, Jianjun Zhang, Hai-Ou Li, Guo-Ping Guo
Summary: The research investigates the impact of strong spin-orbit interaction and weak hyperfine interaction on double quantum dots by applying an external magnetic field to Ge quantum dots. Under high magnetic field, spin-flip tunneling induced by SOI eliminates the Pauli spin blockade, revealing the energy spectrum of the DQD; while under low magnetic field, HFI mixes different states and leads to an increased leakage current.
APPLIED PHYSICS EXPRESS
(2021)
Article
Optics
Matthias Kizmann, Andrey S. Moskalenko, Alfred Leitenstorfer, Guido Burkard, Shaul Mukamel
Summary: Electro-optic sampling is a new quantum technique that allows measurements of electric field fluctuations on subcycle time scales. By imprinting the fluctuations of a terahertz field onto the polarization properties of an ultrashort probe pulse, the statistics of the time-domain signal can be calculated, taking into account the quantum nature of the electric fields. The electro-optic process is described using a microscopic quantum theory, and the quantum response of the nonlinear medium is characterized by interactions mediated by terahertz vacuum fluctuations.
LASER & PHOTONICS REVIEWS
(2022)
Article
Physics, Multidisciplinary
Chao-Wei Sui, Shao-Hua Yuan, Xi-Guang Wang, Jamal Berakdar, Chenglong Jia
Summary: The impact of the transition across the anti-parity-time symmetry breaking point on low-energy spin excitations in a synthetic antiferromagnet is studied. The emergence of a finite net magnetization and low-lying excitations beyond the Goldstone modes are observed in the symmetry-broken phase. A bound state in the continuum is found for systems with interfacial interactions.
NEW JOURNAL OF PHYSICS
(2022)
Article
Multidisciplinary Sciences
Rouven Dreyer, Alexander F. Schaeffer, Hans G. Bauer, Niklas Liebing, Jamal Berakdar, Georg Woltersdorf
Summary: This article introduces the key features of non-linear processes in spin-wave based information processing and their application in device structures. By directly imaging non-linear magnons and demonstrating their phase-locking properties, it shows the existence of spin waves oscillating at half-integer harmonics in the strong modulation regime.
NATURE COMMUNICATIONS
(2022)
Article
Physics, Applied
Alfred Leitenstorfer, Andrey S. Moskalenko, Tobias Kampfrath, Junichiro Kono, Enrique Castro-Camus, Kun Peng, Naser Qureshi, Dmitry Turchinovich, Koichiro Tanaka, Andrea G. Markelz, Martina Havenith, Cameron Hough, Hannah J. Joyce, Willie J. Padilla, Binbin Zhou, Ki-Yong Kim, Xi-Cheng Zhang, Peter Uhd Jepsen, Sukhdeep Dhillon, Miriam Vitiello, Edmund Linfield, A. Giles Davies, Matthias C. Hoffmann, Roger Lewis, Masayoshi Tonouchi, Pernille Klarskov, Tom S. Seifert, Yaroslav A. Gerasimenko, Dragan Mihailovic, Rupert Huber, Jessica L. Boland, Oleg Mitrofanov, Paul Dean, Brian N. Ellison, Peter G. Huggard, Simon P. Rea, Christopher Walker, David T. Leisawitz, Jian Rong Gao, Chong Li, Qin Chen, Gintaras Valusis, Vincent P. Wallace, Emma Pickwell-MacPherson, Xiaobang Shang, Jeffrey Hesler, Nick Ridler, Cyril C. Renaud, Ingmar Kallfass, Tadao Nagatsuma, J. Axel Zeitler, Don Arnone, Michael B. Johnston, John Cunningham
Summary: THz radiation covers a wide spectral range and has diverse applications in various scientific disciplines. The demands for advanced THz technology in radio astronomy, weather forecasting, security imaging, telecommunications, and other fields have driven the development of related technologies. It is important to explore both the scientific and technical aspects to meet the growing needs.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2023)
Article
Physics, Condensed Matter
Yaser Hajati, Mohammad Alipourzadeh, Jamal Berakdar
Summary: The interplay between layer pseudospin, spin, and valley degrees of freedom in transition-metal dichalcogenide (TMD) bilayers with electric and exchange fields is studied, resulting in a spin-valley-layer polarized total anomalous Nernst coefficient. The control of spin, valley, and layer-resolved contributions in bilayer TMDs via electric field tuning is determined. This control of layer degree of freedom in bilayer TMDs magnetoelectrically has relevance for possible applications in spin/valley caloritronics.
JOURNAL OF PHYSICS-CONDENSED MATTER
(2023)
Article
Optics
Sinan Gundogdu, Stephane Virally, Marco Scaglia, Denis V. Seletskiy, Andrey S. Moskalenko
Summary: A new time-domain method is proposed and analyzed for subcycle metrology of quantum electric fields, which involves a combination of a third order nonlinear optical process and homodyne detection with a local oscillator field. The method allows isolation of weak quantum noise contribution by subtracting the shot noise of the local oscillator on a pulse-by-pulse basis. With the centro-symmetric character of the nonlinearity, this method presents novel opportunities for terahertz and mid-infrared quantum field metrologies.
LASER & PHOTONICS REVIEWS
(2023)
Article
Physics, Applied
B. Niedzielski, C. L. Jia, J. Berakdar
Summary: In this study, we investigate the propagation of magnons in a micrometer-sized ferromagnetic waveguide that is influenced by the proximity to a superconductor with vortex formation. By solving the time-dependent Ginzburg-Landau equations of superconductivity, we determine the equilibrium state of the vortex configuration and the associated stray fields that affect the magnetic dynamics. We find that the presence of the vortex lattice leads to the formation of a Bloch-like band structure in the magnon spectrum, with the width and number of allowed bands depending on the in-plane component of the vortex field.
PHYSICAL REVIEW APPLIED
(2023)
Article
Physics, Multidisciplinary
Shaohua Yuan, Chaowei Sui, Zhengduo Fan, Jamal Berakdar, Desheng Xue, Chenglong Jia
Summary: The authors use analytical and numerical simulations to demonstrate that magnetic damping in non-Hermitian antiferromagnets allows for the breakdown of magnonic vacuum and the creation of particle-antiparticle pairs in strong magnetic fields. This offers a platform for observing Klein tunneling at meV energies in experimentally feasible settings, with potential applications in chirality-dependent magnonic computing.
COMMUNICATIONS PHYSICS
(2023)
Article
Physics, Multidisciplinary
Xi-guang Wang, Lu-lu Zeng, Guang-hua Guo, Jamal Berakdar
Summary: This study presents a method for realizing spatiotemporally driven PT-symmetric magnonics and demonstrates the transition between PT-symmetric and broken PT-symmetric phases under different conditions. The magnetization auto-oscillations in the broken PT-symmetric phase occur at low currents and do not require further adjustments, showing potential applications in computing and sensorics.
PHYSICAL REVIEW LETTERS
(2023)
Article
Nanoscience & Nanotechnology
Xi-Guang Wang, Guang-Hua Guo, Jamal Berakdar
Summary: A design for magnetic elements that use excess heat to perform logic operations is presented, allowing for thermal diode and thermal gate operations.
ADVANCED ELECTRONIC MATERIALS
(2023)
Article
Optics
Lars Meschede, Benjamin Schwager, Dominik Schulz, Jamal Berakdar
Summary: Quantum mechanics is sensitive to the geometry of the underlying space. A framework for quantum scattering of a nonrelativistic particle in a two-dimensional space is presented, where scattering occurs from an emergent geometric potential and the metric tensor field. Analytical and full numerical simulations show that the geometric potential is the primary source for low-energy scattering, while the metric tensor field governs high-energy diffraction.
Article
Materials Science, Multidisciplinary
Z. Toklikishvili, L. Chotorlishvili, R. Khomeriki, V. Jandieri, J. Berakdar
Summary: Electromagnonics is an emerging field focusing on entangling magnonic excitations with microwave cavity photon modes for quantum information science. This study discusses a class of Hamiltonians that enable steady-state photon-magnon entanglement via a chiral coupling of the magnonic system to the cavity electric field. The entanglement can be controlled by external parameters. A layered system with varying interfacial Dzyaloshinskii-Moriya interaction is studied as a realization, demonstrating nonlinear magnon-photon dynamics. The derived expressions from stochastic quantum Langevin equations indicate the existence of steady-state entanglement and its dependencies on external probes, suggesting potential applications in quantum information.
Article
Physics, Multidisciplinary
T. L. M. Guedes, I Vakulchyk, D. V. Seletskiy, A. Leitenstorfer, A. S. Moskalenko, Guido Burkard
Summary: The influence of measurement back action on electro-optic sampling of electromagnetic quantum fluctuations is investigated. Based on a cascaded treatment of the nonlinear interaction between a near-infrared coherent probe and the mid-infrared vacuum, we account for the generated electric-field contributions that lead to detectable back action. The setup parameters at which back action starts to considerably contaminate the measured noise profiles are determined. We find that back action starts to detrimentally affect the signal once the fluctuations due to the coupling to the mid-infrared vacuum become comparable to the base shot noise. Due to the vacuum fluctuations entering at the beam splitter, the shot noise of two incoming probe pulses in different channels is uncorrelated. Therefore, even when the base shot noise dominates the output of the experiment, it does not contribute to the correlation signal itself. However, we find that further contributions due to nonlinear shot-noise enhancement are still present. Ultimately, a regime in which electro-optic sampling of quantum fields can be considered as effectively back-action free is found.
PHYSICAL REVIEW RESEARCH
(2023)
Article
Quantum Science & Technology
Michael Berger, Jamal Berakdar
Summary: Quantum states of systems with classical chaotic dynamics can be scarred, and this study demonstrates how the scarred state can be imaged to a region that does not support scarring. This phantom scar has a significant impact on the spin-dependent system dynamics, as shown by explicit calculations for fidelity and correlation functions. Numerical simulations and analysis for the spin-dependent electron dynamics in semiconductor-based double quantum dots provide insights into the coherent phenomenon of scarring and its localization properties in a narrow spectral window.
ADVANCED QUANTUM TECHNOLOGIES
(2023)
Article
Astronomy & Astrophysics
Sho Onoe, Thiago L. M. Guedes, Andrey S. Moskalenko, Alfred Leitenstorfer, Guido Burkard, Timothy C. Ralph
Summary: A new theoretical framework is proposed to describe the experimental advances in electro-optic detection of broadband quantum states. By utilizing concepts from quantum field theory, the nonlinear interaction behind the electro-optic effect is shown to be equivalent to a Unruh-DeWitt detector coupled to a conjugate field. The analysis accurately captures the quantum nature of the vacuum and proposes a specific working regime to experimentally verify the existence of virtual photons with quantum correlations in the electromagnetic ground state.
