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
Chemistry, Multidisciplinary
Jingwei Mu, Shaoyun Huang, Zhi-Hai Liu, Weijie Li, Ji-Yin Wang, Dong Pan, Guang-Yao Huang, Yuanjie Chen, Jianhua Zhao, H. Q. Xu
Summary: The research team successfully demonstrated a highly tunable linear quadruple QD system in a nanowire and obtained characteristic two-dimensional charge stability diagrams through electron transport measurements, providing important experimental evidence for studying multiple QD systems.
Article
Materials Science, Multidisciplinary
Michal Gawelczyk, Krzysztof Gawarecki
Summary: The theoretical study reveals that the spin-flip tunneling rate can be as high as 1% of the spin-conserving one, and the main contribution comes from the Dresselhaus spin-orbit interaction. Despite the absence of a magnetic field, the spin relaxation process remains active at a considerable rate.
Article
Nanoscience & Nanotechnology
Pierre-Andre Mortemousque, Emmanuel Chanrion, Baptiste Jadot, Hanno Flentje, Arne Ludwig, Andreas D. Wieck, Matias Urdampilleta, Christopher Bauerle, Tristan Meunier
Summary: Controlling individual quantum objects organized in arrays is essential for scalable quantum information platforms. By integrating nearest-neighbour coupled semiconductor quantum dots in a 3 x 3 array with finely tuned virtual gate control, 2D coherent spin control has been achieved. Recent efforts in controlling electron spins in quantum dot arrays have led to the realization of quantum simulators and multielectron spin-coherent manipulations. However, demonstrating 2D scaling with a high connectivity of such implementations remains a challenge.
NATURE NANOTECHNOLOGY
(2021)
Article
Materials Science, Multidisciplinary
R. M. Goldblatt, A. M. Martin, A. A. Wood
Summary: In this study, we used nitrogenvacancy centers in diamond to probe the nuclear spins within dark paramagnetic nitrogen defects in the diamond lattice. We demonstrated that the effect of greatly enhanced coupling to radio frequency control fields can be tuned by an external magnetic field. This work lays the foundations for rapid control of long-lived spin qubits at room temperature.
Article
Physics, Multidisciplinary
V Ranjan, Y. Wen, A. K. Keyser, S. E. Kubatkin, A. Danilov, T. Lindstrom, P. Bertet, S. E. de Graaf
Summary: In this study, the researchers demonstrate the ability to control microwave emission from a spin ensemble using a tunable resonator. They suppress echo emission on demand by detuning the resonator during spin rephasing and subjecting spins to magnetic field gradients generated by a bias current. The authors also show that spin coherence is preserved during the silencing process.
PHYSICAL REVIEW LETTERS
(2022)
Article
Materials Science, Multidisciplinary
A. Ceferino, S. J. Magorrian, V Zolyomi, D. A. Bandurin, A. K. Geim, A. Patane, Z. D. Kovalyuk, Z. R. Kudrynskyi, I. Grigorieva, V. Fal'ko
Summary: The paper demonstrates the tunability of spin-orbit coupling strength in few-layer gamma-InSe films, potentially enabling electrically switchable spintronic devices. Theoretical calculations and experimental measurements show good agreement in terms of Dyakonov-Perel spin relaxation due to SOC.
Article
Quantum Science & Technology
George Gillard, Ian M. Griffiths, Gautham Ragunathan, Ata Ulhaq, Callum McEwan, Edmund Clarke, Evgeny A. Chekhovich
Summary: By adjusting the tunneling coupling range, including the limit of isolated quantum dots, we unravel the contributions of spin relaxation mechanisms in quantum dot spins. The experimental results show that while reducing tunneling can extend the lifetime of electron spin qubits, it can also decrease the fidelity of optical spin initialization.
NPJ QUANTUM INFORMATION
(2021)
Article
Chemistry, Physical
Thomas M. Fuchs, Rolf Schaefer
Summary: The magnetic double deflection experiments reveal the impact of nuclear spins on electron spin coherence in isolated AlSn12 clusters, and discuss the superatomic response of nuclear spins in the endohedral cage clusters. By varying the concentration of nuclear spins in the tin cage using isotopically enriched tin samples, the study delves into hyperfine interaction, nuclear spin statistics, and spin dynamics. Furthermore, it is demonstrated that state-interference in the multistate Landau-Zener system AlSn12 explains the significant increase in spin decoherence with the presence of one or two nuclear spins in the cluster.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2021)
Article
Materials Science, Multidisciplinary
V. P. Michal, J. C. Abadillo-Uriel, S. Zihlmann, R. Maurand, Y. -M. Niquet, M. Filippone
Summary: We study a spin circuit-QED device, where a superconducting microwave resonator is connected to a single hole confined in a semiconductor quantum dot via capacitance. The gyromagnetic g matrix of the hole can be electrically modulated due to the strong spin-orbit coupling inherent in valence-band states. This modulation allows for coupling between the photons in the resonator and the hole spin. We demonstrate that the spin-photon interaction can be controlled through gate voltages and magnetic field orientation, and the character of the interaction can switch from fully transverse to fully longitudinal.
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
Physics, Applied
Kohei Etou, Satoshi Hiura, Soyoung Park, Kazuya Sakamoto, Junichi Takayama, Agus Subagyo, Kazuhisa Sueoka, Akihiro Murayama
Summary: The spin-transport properties in an In0.5Ga0.5As quantum dot (QD) spin LED are affected by temperature and bias voltage, influencing spin polarization and spin relaxation. Spin polarization increases with temperature, but may decrease at higher temperatures and voltages. The electric field and temperature can enhance spin relaxation in the undoped GaAs barrier.
PHYSICAL REVIEW APPLIED
(2021)
Article
Quantum Science & Technology
Stefano Bosco, Bence Hetenyi, Daniel Loss
Summary: Hole Si fin field-effect transistors (FinFETs) are shown to be highly compatible with modern CMOS technology and have operational sweet spots where charge noise is completely removed. The presence of these sweet spots is a result of the interplay between material anisotropy and the shape of the FinFET cross section. Designs that maximize qubit performance and potentially pave the way towards a scalable spin-based quantum computer are identified.
Article
Optics
Yasuyoshi Mitsumori, Kentaro Uedaira, Satoshi Shimomura, Keiichi Edamatsu
Summary: A transient photoinduced Kerr rotation spectroscopy technique was developed to study spin dynamics of microscopic quantum states in solids, with the use of heterodyne detection scheme. The results showed a maximum rotation angle of a few micro radians for a single quantum dot exciton. This technique allows for clear observation of photoinduced spin dynamics with weak probe intensity.
Article
Chemistry, Inorganic & Nuclear
Gheorghe Taran, Edgar Bonet, Eufemio Moreno-Pineda, Mario Ruben, Wolfgang Wernsdorfer
Summary: Through numerical simulation, we find that phonon-modulated hyperfine interaction opens a direct relaxation channel between the nuclear spins and the phonon bath. The mechanism is of potential importance for the theory of spin bath and the relaxation dynamics of the molecular spins.
INORGANIC CHEMISTRY
(2023)
