Article
Chemistry, Multidisciplinary
Maria L. K. Viitaniemi, Christian Zimmermann, Vasileios Niaouris, Samuel H. D'Ambrosia, Xingyi Wang, E. Senthil Kumar, Faezeh Mohammadbeigi, Simon P. Watkins, Kai-Mei C. Fu
Summary: Utilizing indium donors, this study demonstrates the favorable optical and electron spin properties in ZnO nanowires. The research shows that the optical line width of single nanowires is comparable to bulk single-crystalline ZnO and successfully achieves spin initialization and observation of coherent population trapping.
Review
Quantum Science & Technology
Dmitry Yu. Fedyanin
Summary: Color centers in diamond, silicon carbide, and related materials have emerged as promising platforms for quantum technology applications, demonstrating outstanding optical and spin properties. Recent studies have shown that color centers can exchange electrons and holes with the host material, enabling novel functionalities.
ADVANCED QUANTUM TECHNOLOGIES
(2021)
Article
Multidisciplinary Sciences
Jia-Shiang Chen, Kasidet Jing Trerayapiwat, Lei Sun, Matthew D. Krzyaniak, Michael R. Wasielewski, Tijana Rajh, Sahar Sharifzadeh, Xuedan Ma
Summary: Researchers report highly confined and long-lived electron spins in chemically functionalized nanotubes and demonstrate their coherent control. These findings indicate that combining molecular approaches with inorganic crystalline systems provides a powerful route for reproducible and scalable quantum materials suitable for qubit applications.
NATURE COMMUNICATIONS
(2023)
Article
Quantum Science & Technology
Jacob Z. Blumoff, Andrew S. Pan, Tyler E. Keating, Reed W. Andrews, David W. Barnes, Teresa L. Brecht, Edward T. Croke, Larken E. Euliss, Jacob A. Fast, Clayton A. C. Jackson, Aaron M. Jones, Joseph Kerckhoff, Robert K. Lanza, Kate Raach, Bryan J. Thomas, Roland Velunta, Aaron J. Weinstein, Thaddeus D. Ladd, Kevin Eng, Matthew G. Borselli, Andrew T. Hunter, Matthew T. Rakher
Summary: We demonstrate rapid high-fidelity state preparation and measurement in exchange-only Si/SiGe triple-quantum-dot qubits. The achieved fidelity of 2.5 +/- 0.5 x 10(-3) is enabled by a high-valley-splitting heterostructure, careful initialization, and assessment of T-1 during spin-to-charge conversion. This work shows promising capabilities for scalable quantum information processing in Si/SiGe triple-dot qubits.
Article
Chemistry, Multidisciplinary
P. Kumar, H. Kim, S. Tripathy, K. Watanabe, T. Taniguchi, K. S. Novoselov, D. Kotekar-Patil
Summary: Semiconducting transition metal dichalcogenides (TMDCs) are promising materials for quantum dots and spin-qubit implementation. However, the current quantum dots in TMDCs do not meet the requirements for reliable measurement of excited state spectroscopy and the g-factor. In this study, we successfully achieved electron transport through discrete energy levels in a single layer MoS2 using a dual gate geometry. By accurately measuring the ground state g-factor and observing a spin-filling sequence, we provide a useful platform for evaluating and implementing spin-valley qubits in TMDCs, thus accelerating the development of quantum systems in two-dimensional semiconducting TMDCs.
Article
Chemistry, Multidisciplinary
Ivana Borilovic, Olivier Roubeau, Boris Le Guennic, Joris van Slageren, Samuel Lenz, Simon J. Teat, Guillem Aromi
Summary: An asymmetric bis-phenol-beta-diketone (H4L) has been designed as a ligand that promotes the assembly of three magnetically exchanged [NiCu] pairs, each exhibiting an S = 1/2 spin. EPR and magnetometry measurements show that these pairs are good qubit realizations and non-equivalent within the molecule in the solid state, meeting the requirements for conditional quantum gates.
CHEMICAL COMMUNICATIONS
(2022)
Article
Quantum Science & Technology
Jordi Pico-Cortes, Gloria Platero
Summary: This study investigates the response of a double quantum dot-based qubit to charge noise under the influence of AC gates, and how the exchange interaction can be manipulated by tuning the AC driving. The research shows the possibility of inducing a second-order sweetspot in the resonant spin-triplet qubit, significantly increasing the dephasing time.
Article
Materials Science, Multidisciplinary
Junyoung Kwon, Shoresh Soltani, Craig Polley, Jongkeun Jung, Minsoo Kim, Donghan Kim, Jonathan Denlinger, Dongjoon Song, Yoshiyuki Yoshida, Wonshik Kyung, Changyoung Kim
Summary: In this study, we performed experiments on an electron-doped Sr2RhO4 system to investigate the metal-insulator transition induced by electron doping. By comparing the results from different doping agents, we established the universality of the metal-insulator transition in electron-doped Sr2RhO4. Through a systematic analysis of doping-dependent transport and ARPES data, we found that the correlation driven metal-insulator transition in electron-doped Sr2RhO4 with a noninteger electron number is universal. Moreover, the ARPES analysis suggests that the band topology determined by spin-orbit coupling is a control parameter of the insulating gap size and critical electron number of the metal-insulator transition.
Article
Quantum Science & Technology
Abhikbrata Sarkar, Joel Hochstetter, Allen Kha, Xuedong Hu, Michelle Y. Simmons, Rajib Rahman, Dimitrie Culcer
Summary: Multi-donor quantum dots play a crucial role in the development of Si-based quantum computation. Specifically, 2P:1P spin qubits with built-in dipole moment are suitable for electron dipole spin resonance (EDSR) due to the donor hyperfine interaction. The fastest EDSR time occurs when the 2P:1P axis is parallel to [111], while the best Rabi ratio occurs when it is parallel to [100]. The qubit is robust against 1/f noise if operated away from the charge anti-crossing. Entanglement via exchange is significantly faster than dipole-dipole coupling.
NPJ QUANTUM INFORMATION
(2022)
Article
Chemistry, Physical
Svetoslav Nikolov, Mitchell A. Wood, Attila Cangi, Jean-Bernard Maillet, Mihai-Cosmin Marinica, Aidan P. Thompson, Michael P. Desjarlais, Julien Tranchida
Summary: A data-driven framework is presented for building magneto-elastic machine-learning interatomic potentials (ML-IAPs) for large-scale spin-lattice dynamics simulations. The combined potential energy surface yields excellent agreement with first-principles magneto-elastic calculations and quantitative predictions of diverse materials properties across the ferromagnetic-paramagnetic phase transition. The efficacy of this data-driven framework is demonstrated across magneto-structural phase transitions by generating a magneto-elastic ML-IAP for alpha-iron.
NPJ COMPUTATIONAL MATERIALS
(2021)
Article
Multidisciplinary Sciences
Qi Zhang, Yuhang Guo, Wentao Ji, Mengqi Wang, Jun Yin, Fei Kong, Yiheng Lin, Chunming Yin, Fazhan Shi, Ya Wang, Jiangfeng Du
Summary: The nitrogen-vacancy (NV) center in diamond is crucial for achieving high-fidelity single-shot readout of qubits, with a new spin-to-charge conversion method introduced to suppress spin-flip errors. This technique shows potential for exceeding fault-tolerant thresholds and may have applications in integrated optoelectronic devices.
NATURE COMMUNICATIONS
(2021)
Article
Multidisciplinary Sciences
W. I. L. Lawrie, M. Rimbach-Russ, F. van Riggelen, N. W. Hendrickx, S. L. de Snoo, A. Sammak, G. Scappucci, J. Helsen, M. Veldhorst
Summary: As quantum processors scale up, the accurate characterization of errors due to crosstalks between qubits is important. This study presents a novel benchmarking protocol to analyze single-gate fidelities in a 2x2 hole spin qubit array in germanium. The results show high gate fidelities and robustness to crosstalk errors, providing crucial information for scaling up quantum information technology.
NATURE COMMUNICATIONS
(2023)
Article
Physics, Applied
Brennan Undseth, Xiao Xue, Mohammad Mehmandoost, Maximilian Rimbach-Russ, Pieter T. Eendebak, Nodar Samkharadze, Amir Sammak, Viatcheslav V. Dobrovitski, Giordano Scappucci, Lieven M. K. Vandersypen
Summary: Micromagnet-based electric dipole spin resonance is a promising method for scaling silicon spin qubits in gate-defined quantum dots, while maintaining long coherence times and high control fidelities. However, understanding and mitigating cross-talk mechanisms is crucial for accurately controlling dense arrays of qubits using a multiplexed drive. We identified an unexpected cross-talk mechanism where the Rabi frequency of a driven qubit is significantly affected by the drive of an adjacent qubit. These findings have important implications for scaling single-qubit control.
PHYSICAL REVIEW APPLIED
(2023)
Article
Instruments & Instrumentation
Anton Savitsky, Jingfu Zhang, Dieter Suter
Summary: In this study, a planar microwave resonator optimized for microwave-optical double resonance experiments on single NV centers in diamond is presented. The resonator is composed of a wide microstrip line symmetrically connected to two 50 ohm microstrip feed lines. An omega-shaped loop at the center of the resonator focuses the current and the mw magnetic field, generating a relatively homogeneous magnetic field over a volume of 0.07 x 0.1 mm³. The resonator operates at 2.9 GHz in both transmission and reflection modes with bandwidths of 1000 and 400 MHz, respectively.
REVIEW OF SCIENTIFIC INSTRUMENTS
(2023)
Article
Engineering, Electrical & Electronic
Sameer Kumar Sharma, Andrea Luttgen, Costas D. Sarris
Summary: A systematic method is presented for integrating 5G printed antennas with bezel-less capacitive touch sensor panels, addressing the reflection issue and achieving high-quality data transfer through optimized electrode design. The optimized touch sensing electrodes act as frequency selective surfaces, allowing antennas to claim the space underneath the TSP, crucial for 5G wireless standards requiring multiple antennas for intelligent radios.
IEEE SENSORS JOURNAL
(2021)
