Article
Multidisciplinary Sciences
R. Srinivas, S. C. Burd, H. M. Knaack, R. T. Sutherland, A. Kwiatkowski, S. Glancy, E. Knill, D. J. Wineland, D. Leibfried, A. C. Wilson, D. T. C. Allcock, D. H. Slichter
Summary: Researchers have successfully demonstrated high-fidelity laser-free universal control of two trapped-ion qubits by utilizing microwave technology combined with radiofrequency magnetic field gradients. This technology allows for simultaneous entangling operations on multiple pairs of ions without increasing control signal power or complexity.
Article
Physics, Multidisciplinary
Alec Jenkins, Joanna W. Lis, Aruku Senoo, William F. McGrew, Adam M. Kaufman
Summary: This study reports a fast, scalable, and high-fidelity qubit architecture based on 171Yb atoms, and proposes a near-deterministic loading protocol that is expected to play an important role in quantum simulation and information applications.
Article
Multidisciplinary Sciences
Aaron J. Weinstein, Matthew D. Reed, Aaron M. Jones, Reed W. Andrews, David Barnes, Jacob Z. Blumoff, Larken E. Euliss, Kevin Eng, Bryan H. Fong, Sieu D. Ha, Daniel R. Hulbert, Clayton A. C. Jackson, Michael Jura, Tyler E. Keating, Joseph Kerckhoff, Andrey A. Kiselev, Justine Matten, Golam Sabbir, Aaron Smith, Jeffrey Wright, Matthew T. Rakher, Thaddeus D. Ladd, Matthew G. Borselli
Summary: This study demonstrates an alternative approach to quantum computation that uses energy-degenerate encoded qubit states controlled by nearest-neighbour contact interactions, bypassing microwave-associated correlated errors. The combination of enriched silicon, all-electrical partial swap operations, and configurable encoding offers a strong pathway towards scalable fault tolerance and computational advantage.
Review
Computer Science, Information Systems
Yan Liang, Pu Shen, Tao Chen, Zheng-Yuan Xue
Summary: The geometric phase has the advantage of being resistant to certain local noises due to its reliance on global properties of the evolution path. Additionally, the non-Abelian geometric phase in matrix form can be used for high-performance quantum gates, known as holonomic quantum computation. This article reviews recent advancements in nonadiabatic holonomic quantum computation, focusing on optimal control approaches to enhance gate performance in terms of fidelity and robustness. The possibilities and concrete examples of physical realizations are also discussed. Ultimately, state-of-the-art technology allows implemented holonomic quantum gates to outperform conventional dynamical ones under certain conditions.
SCIENCE CHINA-INFORMATION SCIENCES
(2023)
Article
Quantum Science & Technology
F. van Riggelen, W. I. L. Lawrie, M. Russ, N. W. Hendrickx, A. Sammak, M. Rispler, B. M. Terhal, G. Scappucci, M. Veldhorst
Summary: The study demonstrates the feasibility of implementing quantum error correction codes using a four-qubit array in germanium and successfully demonstrates key quantum gate operations. Although significant improvement in the quality and quantity of qubits is needed, the implementation of quantum error correction codes enables co-design development of quantum hardware and software.
NPJ QUANTUM INFORMATION
(2022)
Article
Physics, Multidisciplinary
Yuhei Sekiguchi, Yuki Yasui, Kazuya Tsurumoto, Yuta Koga, Raustin Reyes, Hideo Kosaka
Summary: This study discusses the geometric entanglement properties of spin and photons, showing a high fidelity of entanglement through experiments. The research lays the foundation for establishing noise-resilient quantum repeater networks or quantum internet.
COMMUNICATIONS PHYSICS
(2021)
Article
Quantum Science & Technology
Cheng-Yun Ding, Li-Na Ji, Tao Chen, Zheng-Yuan Xue
Summary: A path-optimized scheme for geometric quantum computation on superconducting transmon qubits is proposed, which can implement high-fidelity and robust universal nonadiabatic geometric gates based on conventional experimental setups. Numerical simulations demonstrate the superior fidelities of the constructed geometric gates compared to their dynamical counterparts, making the scheme promising for large-scale fault-tolerant quantum computation.
QUANTUM SCIENCE AND TECHNOLOGY
(2022)
Article
Physics, Multidisciplinary
Emma Rosenfeld, Ralf Riedinger, Jan Gieseler, Martin Schuetz, Mikhail D. Lukin
Summary: In the lab, scientists have proposed a scheme that uses a hot mechanical oscillator to entangle distant spin qubits, showing that it is feasible with realistic parameters. They found that high-fidelity entanglement can be achieved at low and ambient temperatures, opening up new possibilities for quantum processing of solid-state spin qubits.
PHYSICAL REVIEW LETTERS
(2021)
Article
Physics, Multidisciplinary
Or Katz, Marko Cetina, Christopher Monroe
Summary: We present a simple protocol for generating N-body entangling interactions between trapped atomic ion qubits in a single step. By utilizing qubit state-dependent squeezing operations and displacement forces on the collective atomic motion, full N-body interactions can be achieved. This N-body gate operation allows for the single-step implementation of a family of N-bit gate operations, including the powerful N-Toffoli gate.
PHYSICAL REVIEW LETTERS
(2022)
Article
Quantum Science & Technology
Chengxian Zhang, Tao Chen, Xin Wang, Zheng-Yuan Xue
Summary: A theoretical framework for implementing universal geometric quantum gates in semiconductor-based charge qubits confined in double quantum dots is provided to reduce the effects of charge noises. Through numerical simulation, it is shown that geometric gates outperform dynamical gates across a wide range of tunneling noise levels, particularly suitable to be used in conjunction with microwave driving. Introduction of a hybrid system allows for the construction of an entangling geometric gate with fidelity higher than that of the dynamical gate for experimentally relevant noise levels, suggesting that geometric quantum gates are powerful tools for high-fidelity manipulation of charge qubits.
ADVANCED QUANTUM TECHNOLOGIES
(2021)
Article
Physics, Multidisciplinary
Stephen D. Erickson, Jenny J. Wu, Pan-Yu Hou, Daniel C. Cole, Shawn Geller, Alex Kwiatkowski, Scott Glancy, Emanuel Knill, Daniel H. Slichter, Andrew C. Wilson, Dietrich Leibfried
Summary: This study proposes and demonstrates a protocol for high-fidelity indirect readout of trapped ion hyperfine qubits. By mapping the state of one ion to a readout ion using laser-driven Raman transitions, the protocol reduces errors and allows for repetition to improve readout fidelity.
PHYSICAL REVIEW LETTERS
(2022)
Article
Optics
Yuhei Sekiguchi, Kazuki Matsushita, Yoshiki Kawasaki, Hideo Kosaka
Summary: This study demonstrates precise manipulation of an optically selected electron spin in a nitrogen-vacancy center in diamond through microwave-driven holonomic quantum gates. Optically addressable entanglement is achieved between the electron spin and an adjacent nitrogen nuclear spin. This research is significant for the development of large-scale quantum processors and memories.
Article
Nanoscience & Nanotechnology
Will Gilbert, Tuomo Tanttu, Wee Han Lim, MengKe Feng, Jonathan Y. Huang, Jesus D. Cifuentes, Santiago Serrano, Philip Y. Mai, Ross C. C. Leon, Christopher C. Escott, Kohei M. Itoh, Nikolay V. Abrosimov, Hans-Joachim Pohl, Michael L. W. Thewalt, Fay E. Hudson, Andrea Morello, Arne Laucht, Chih Hwan Yang, Andre Saraiva, Andrew S. Dzurak
Summary: This study demonstrates fast electrical control of electron spin in silicon quantum dots by exploiting the switchable interaction between spin and orbital motion of electrons without using a micromagnet. By controlling the energy quantization of electrons in nanostructures, the weak effects of the relativistic spin-orbit interaction in silicon are enhanced, leading to a significant increase in Rabi frequency. The achieved coherence time, gate performance, and gate fidelity show the potential for high-performance all-electrical control in scalable silicon quantum computing.
NATURE NANOTECHNOLOGY
(2023)
Article
Quantum Science & Technology
Yimin Wang, Gangcheng Wang, Hua Zhou, Zhiyong Xu, Liang Ao, Chunfeng Wu
Summary: In this work, a physically feasible scheme is proposed to perform scalable non-adiabatic non-Abelian holonomic quantum computations, which can improve the fidelity of quantum gate operations in superconducting-qubit systems. This scheme is of practical importance for advancing robust quantum computation.
QUANTUM INFORMATION PROCESSING
(2022)
Article
Physics, Multidisciplinary
Jing Xia, Xichao Zhang, Xiaoxi Liu, Yan Zhou, Motohiko Ezawa
Summary: We propose a skyrmion-based universal quantum computer that utilizes the helicity degree of freedom in frustrated magnets. It is shown that the quantum computation can be achieved based on nanoscale skyrmions in a magnetic bilayer system. Single-qubit gates are realized by controlling the electric field and spin current, while the two-qubit gate is achieved through Ising-type exchange coupling. The advantage of this mechanism is the elimination of the need for an external magnetic field. Our results may pave the way for universal quantum computation based on nanoscale topological spin textures.
PHYSICAL REVIEW LETTERS
(2023)
Article
Multidisciplinary Sciences
Yuhei Sekiguchi, Yusuke Komura, Shota Mishima, Touta Tanaka, Naeko Niikura, Hideo Kosaka
NATURE COMMUNICATIONS
(2016)
Article
Optics
Yuhei Sekiguchi, Naeko Niikura, Ryota Kuroiwa, Hiroki Kano, Hideo Kosaka
Article
Optics
Naoki Ishida, Takaaki Nakamura, Touta Tanaka, Shota Mishima, Hiroki Kano, Ryota Kuroiwa, Yuhei Sekiguchi, Hideo Kosaka
Article
Physics, Applied
Yuhei Sekiguchi, Yusuke Komura, Hideo Kosaka
PHYSICAL REVIEW APPLIED
(2019)
Article
Physics, Multidisciplinary
Kazuya Tsurumoto, Ryota Kuroiwa, Hiroki Kano, Yuhei Sekiguchi, Hideo Kosaka
COMMUNICATIONS PHYSICS
(2019)