Article
Physics, Multidisciplinary
Yukio Kawashima, Erika Lloyd, Marc P. Coons, Yunseong Nam, Shunji Matsuura, Alejandro J. Garza, Sonika Johri, Lee Huntington, Valentin Senicourt, Andrii O. Maksymov, Jason H. V. Nguyen, Jungsang Kim, Nima Alidoust, Arman Zaribafiyan, Takeshi Yamazaki
Summary: Problem decomposition methods can help overcome size limitations of quantum hardware for large-scale electronic structure simulations. Researchers demonstrated experimentally that decomposing a large molecule into smaller fragments can be applicable to currently available quantum computers, showcasing the potential of quantum hardware in material design and drug discovery.
COMMUNICATIONS PHYSICS
(2021)
Article
Physics, Multidisciplinary
Eli Chertkov, Justin Bohnet, David Francois, John Gaebler, Dan Gresh, Aaron Hankin, Kenny Lee, David Hayes, Brian Neyenhuis, Russell Stutz, Andrew C. Potter, Michael Foss-Feig
Summary: An experiment with a trapped-ion quantum processor demonstrates the efficient simulation of the evolution of infinite entangled states using holographic technique and quantum tensor-network methods. The results show excellent quantitative agreement with theoretical predictions, indicating the potential of practical quantum computational advantage in science and technology.
Article
Quantum Science & Technology
Matthew L. Day, Kaushal Choonee, Zachary Chaboyer, Simon Gross, Michael J. Withford, Alastair G. Sinclair, Graham D. Marshall
Summary: The study combines arrays of fibers, 3D laser-written waveguides, and diffractive microlenses to demonstrate a micro-optic interconnect suitable for large-scale quantum information processors based on trapped ions. The module can guide ten independent laser beams to illuminate spatially separated target points, with low crosstalk intensities and average insertion loss.
QUANTUM SCIENCE AND TECHNOLOGY
(2021)
Article
Multidisciplinary Sciences
J. M. Pino, J. M. Dreiling, C. Figgatt, J. P. Gaebler, S. A. Moses, M. S. Allman, C. H. Baldwin, M. Foss-Feig, D. Hayes, K. Mayer, C. Ryan-Anderson, B. Neyenhuis
Summary: The QCCD proposal outlines a blueprint for a universal quantum computer using mobile ions as qubits, limiting quantum interactions to small ion crystals to maintain low error rates demonstrated in small experiments. The integration of necessary elements into a programmable trapped-ion quantum computer has led to the realization of a teleported CNOT gate with negligible crosstalk error and high quantum volume, showing the potential for high-performance quantum computers.
Article
Quantum Science & Technology
Nikodem Grzesiak, Andrii Maksymov, Pradeep Niroula, Yunseong Nam
Summary: This article discusses the importance of parallel operations in quantum computing and the advantages of EASE gates. By implementing EASE gates in parallel, efficient quantum circuits can be realized on trapped-ion quantum computers, which is significant for quantum chemistry simulations and pattern matching algorithms.
Article
Multidisciplinary Sciences
Pavel Hrmo, Benjamin Wilhelm, Lukas Gerster, Martin W. van Mourik, Marcus Huber, Rainer Blatt, Philipp Schindler, Thomas Monz, Martin Ringbauer
Summary: Quantum information carriers naturally occupy high-dimensional Hilbert spaces, and high-dimensional (qudit) quantum systems are becoming a powerful resource for quantum processors. Generating the desired interaction efficiently in these systems is crucial. In this study, the authors demonstrate the implementation of a native two-qudit entangling gate up to dimension 5 in a trapped-ion system. They use a light-shift gate mechanism to generate genuine qudit entanglement in a single application of the gate, which seamlessly adapts to the local dimension of the system with a calibration overhead independent of the dimension. Native entangling techniques for qudits are important for encoding quantum information.
NATURE COMMUNICATIONS
(2023)
Article
Physics, Applied
Sagar Silva Pratapsi, Patrick H. Huber, Patrick Barthel, Sougato Bose, Christof Wunderlich, Yasser Omar
Summary: This study presents and experimentally verifies a method of implementing classical logical gates on quantum technologies. By using 171Yb+ ions in a macroscopic linear Paul trap as qubits, Toffoli and Half-Adder circuits suitable for classical computation are proposed. The study analyzes the energy required to operate the logic gates, identifies existing issues and possible improvements, and provides an experimentally verified energetic model for the energetics of quantum information.
APPLIED PHYSICS LETTERS
(2023)
Article
Optics
Allison L. Carter, Sean R. Muleady, Athreya Shankar, Jennifer F. Lilieholm, Bryce B. Bullock, Matthew Affolter, Ana Maria Rey, John J. Bollinger
Summary: In this study, we theoretically investigate the impact of spontaneous emission on quantum gate operations with trapped-ion ground-state Zeeman qubits in a high magnetic field. We compare the performance of two types of gates and explore different operating points. Our results show that both gate types can achieve similar performance at high magnetic fields.
Article
Chemistry, Multidisciplinary
Jacob Whitlow, Zhubing Jia, Ye Wang, Chao Fang, Jungsang Kim, Kenneth R. Brown
Summary: This article presents a quantum simulation of conical intersections using a trapped atomic ion system, and experimentally observes the manifestation of geometric phase, demonstrating the advantage of combining spin and motion for quantum simulation of chemical reactions.
Article
Quantum Science & Technology
Swarnadeep Majumder, Christopher G. Yale, Titus Morris, Daniel S. Lobser, Ashlyn D. Burch, Matthew N. H. Chow, Melissa C. Revelle, Susan M. Clark, Raphael C. Pooser
Summary: Quantum computing testbeds exhibit high-fidelity quantum control over small collections of qubits, enabling precise and repeatable operations followed by measurements. These testbeds, despite their imperfections, can be used to develop quantum computer algorithms and techniques for noise mitigation. Coherent noise mitigation techniques can be used as a characterization tool in trapped-ion testbeds, helping to identify and model noise sources, and improve the performance for specific applications like quantum chemistry. Understanding the noise sources and their impact on algorithm performance allows for application-aware hardware code-design and improvement in future hardware generations.
Article
Mechanics
V. Dzanic, C. S. From, Z. Wang, A. Gupta, C. Xie, E. Sauret
Summary: In this study, the existence of an additional mechanism provided by viscoelastic fluids in porous media for enhancing oil recovery is demonstrated. The mechanism is attributed to the buildup of polymer stresses near fluid-solid contact regions, which contributes to an additional forcing contribution that displaces trapped oil droplets. The study suggests that the use of viscoelastic fluids has the potential to provide an additional method for improving oil recovery in porous media.
Article
Physics, Multidisciplinary
Reinhold Blumel, Nikodem Grzesiak, Nhung H. Nguyen, Alaina M. Green, Ming Li, Andrii Maksymov, Norbert M. Linke, Yunseong Nam
Summary: To scale up quantum processors and achieve quantum advantage, a new gate-optimizing principle has been introduced to trade off negligible amounts of gate fidelity for substantial savings in power, leading to significant increases in gate speed and/or qubit connectivity. This method has been experimentally verified on a trapped-ion quantum computer and provides increased robustness to mode drift.
PHYSICAL REVIEW LETTERS
(2021)
Article
Quantum Science & Technology
Mingyu Kang, Qiyao Liang, Ming Li, Yunseong Nam
Summary: To achieve high-fidelity operations on a large-scale quantum computer, the parameters of the physical system must be efficiently characterized with high accuracy. For trapped ions, the entanglement between qubits is mediated by the motional modes of the ion chain, and thus characterizing the motional-mode parameters becomes essential. In this paper, physical models are developed to accurately predict both magnitude and sign of the Lamb-Dicke parameters when the modes are probed in parallel. An advanced characterization protocol is also devised to significantly shorten the characterization time compared to the conventional method.
QUANTUM SCIENCE AND TECHNOLOGY
(2023)
Article
Optics
Prajit Dhara, Norbert M. Linke, Edo Waks, Saikat Guha, Kaushik P. Seshadreesan
Summary: Trapped ions have the potential to serve as quantum repeaters in long distance quantum communication due to their advanced technology platform. The use of hybrid traps with two distinct species of ions can enhance the entanglement distribution rate, making trapped-ion systems more feasible and important in this field.
Article
Physics, Multidisciplinary
Yotam Shapira, Sapir Cohen, Nitzan Akerman, Ady Stern, Roee Ozeri
Summary: In this study, we enhance the fidelity and robustness of entangling gates in quantum computers by introducing spin-dependent squeezing.
PHYSICAL REVIEW LETTERS
(2023)