Article
Optics
Shihao Ru, Yunlong Wang, Min An, Feiran Wang, Pei Zhang, Fuli Li
Summary: The study successfully designed and implemented a deterministic Toffoli gate and generated Bell states using a controlled NOT gate. The effective conversion rate of the Toffoli gate in the experiment was found to be 95.1%, without the need for auxiliary photons and probabilistic postselections.
Article
Optics
Qi-Ping Su, Yu Zhang, Chui-Ping Yang
Summary: This study proposes a one-step implementation of a multi-target qubit controlled-NOT gate, where a superconducting qubit controls multiple cat-state qubits simultaneously. The gate operation is simple, quick, and independent of the number of target qubits.
Article
Quantum Science & Technology
Wen-Wu Liu, Chun-Ling Zhang, Ling Zhang
Summary: In this paper, a one-step scheme to generate a CNOT gate via transitionless quantum driving is proposed, which exhibits robustness against instability related to variation in experimental parameters and decoherence. The scheme can be extended to generate a Toffoli gate for large-scale quantum computers, and its implementation is greatly simplified by involving only a single step.
QUANTUM INFORMATION PROCESSING
(2021)
Article
Multidisciplinary Sciences
Mateusz T. Madzik, Serwan Asaad, Akram Youssry, Benjamin Joecker, Kenneth M. Rudinger, Erik Nielsen, Kevin C. Young, Timothy J. Proctor, Andrew D. Baczewski, Arne Laucht, Vivien Schmitt, Fay E. Hudson, Kohei M. Itoh, Alexander M. Jakob, Brett C. Johnson, David N. Jamieson, Andrew S. Dzurak, Christopher Ferrie, Robin Blume-Kohout, Andrea Morello
Summary: This study demonstrates universal quantum logic operations using nuclear spins in a silicon nanoelectronic device, achieving high-fidelity entangled states. The precise characterization of quantum operations shows that nuclear spins are approaching the performance required for fault-tolerant quantum processors. Additionally, the entanglement between nuclear spins and electron spins is also demonstrated. The results establish a viable route for scalable quantum information processing using donor nuclear and electron spins.
Article
Quantum Science & Technology
Zhiyuan Li, Pei Liu, Peng Zhao, Zhenyu Mi, Huikai Xu, Xuehui Liang, Tang Su, Weijie Sun, Guangming Xue, Jing-Ning Zhang, Weiyang Liu, Yirong Jin, Haifeng Yu
Summary: In this work, we demonstrate the successful implementation of arbitrary single-qubit gates with near perfect fidelity in a transmon-qubit system. We achieve an average gate error below 10^(-4) by performing randomized benchmarking. By experimentally obtaining an error budget and reconstructing the process matrices for the single-qubit gates, we improve our understanding of the error sources and validate the simulation results. This demonstration extends the upper limit of single-qubit gate fidelity in a transmon-qubit system and represents a crucial step towards practical and reliable quantum computation in the future.
NPJ QUANTUM INFORMATION
(2023)
Article
Physics, Applied
Aneirin J. Baker, Gerhard B. P. Huber, Niklas J. Glaser, Federico Roy, Ivan Tsitsilin, Stefan Filipp, Michael J. Hartmann
Summary: In this study, a single shot method for executing an i-Toffoli gate using currently existing superconducting hardware is proposed. The method has demonstrated high process fidelity and fast gate time, and can be extended to implement gates with more than two control qubits at similar fidelities.
APPLIED PHYSICS LETTERS
(2022)
Article
Physics, Multidisciplinary
Yi-Ming Wu, Gang Fan, Fang-Fang Du
Summary: We propose an error-detected hyperparallel Toffoli gate for a three-photon system based on the interface between polarized photon and cavity-nitrogen-vacancy (NV) center system. This gate can simultaneously perform double Toffoli gate operations on both the polarization and spatial-mode degrees of freedom with low decoherence and less quantum resources required. It achieves near-unit fidelity by transforming imperfect cavity-NV-center interactions into detectable failures based on a heralding mechanism. The gate efficiency is further improved by recycling the procedures, and the evaluation with achieved experiment parameters shows its feasibility and potential as a building block for quantum compute.
FRONTIERS OF PHYSICS
(2022)
Article
Quantum Science & Technology
Zhiwei Song, Lin Chen, Mengyao Hu
Summary: This study demonstrates the construction of three-qubit unitary gates at different levels of Schmidt rank, showing the Schmidt rank of Toffoli and Fredkin gates. The gates can be implemented using CNOT gates, local Hadamard gates, and flip gates. Additionally, a three-qubit unitary gate of Schmidt rank seven can be achieved using the known Strassen tensor.
QUANTUM INFORMATION PROCESSING
(2021)
Article
Multidisciplinary Sciences
M. H. Abobeih, Y. Wang, J. Randall, S. J. H. Loenen, C. E. Bradley, M. Markham, D. J. Twitchen, B. M. Terhal, T. H. Taminiau
Summary: Solid-state spin qubits have shown promise in quantum computation and quantum networks. Recent experiments have demonstrated high-quality control over multi-qubit systems, elementary quantum algorithms, and non-fault-tolerant error correction. This study demonstrates fault-tolerant operations on a logical qubit using spin qubits in diamond, paving the way for reliable quantum information processing.
Article
Multidisciplinary Sciences
Stephan G. J. Philips, Sergey Amitonov, Sander L. de Snoo, Maximilian Russ, Nima Kalhor, Christian Volk, William I. L. Lawrie, Delphine Brousse, Larysa Tryputen, Brian Paquelet Wuetz, Amir Sammak, Menno Veldhorst, Giordano Scappucci, Lieven M. K. Vandersypen
Summary: Future quantum computers require a large number of reliable qubits, but this is typically conflicting with high fidelity operations. In this study, a six-qubit processor was designed and operated with high fidelities for universal operation, state preparation, and measurement, using careful Hamiltonian engineering and efficient calibration. These advances are a major stepping stone towards large-scale quantum computers.
Article
Optics
Paromita De, Sapana Ranwa, Sourangshu Mukhopadhyay
Summary: The authors have demonstrated an all-optical Fredkin gate using interference-based controlled swap operation. The gate has a small footprint and achieves phase shifts through variation in light path length. The simulation uses a wavelength of 1550 nm. This reversible logic gate optimizes power consumption and operates non-dissipatively, showing faster operation compared to other Fredkin gates using nonlinearities and proposing a good contrast ratio.
OPTICS AND LASER TECHNOLOGY
(2023)
Article
Physics, Multidisciplinary
Javid Ahmad Malik, Muzaffar Qadir Lone, Rayees Ahmad Malla
Summary: In this article, a new scheme for symmetric bidirectional quantum teleportation is proposed using a six-qubit cluster state as the quantum channel. The efficiency of the proposed protocol is remarkably increased to 50%, which is the highest achieved so far. Interestingly, only GHZ-state measurements and four Toffoli-gate operations are necessary, independent of the number of qubits to be teleported.
PRAMANA-JOURNAL OF PHYSICS
(2023)
Article
Physics, Applied
Li-Na Sun, L-L Yan, Shi-Lei Su, Y. Jia
Summary: We propose a one-step scheme to implement time-optimal nonadiabatic holonomic three-qubit controlled gates in Rydberg atoms, achieving significant reductions in evolution time and higher fidelity and robustness. This scheme is also independent of specific physical platforms, potentially allowing for wider applications.
PHYSICAL REVIEW APPLIED
(2021)
Article
Optics
Maria Maffei, Cyril Elouard, Bruno O. Goes, Benjamin Huard, Andrew N. Jordan, Alexia Auffeves
Summary: This study demonstrates that anomalous weak values and Wigner function negativities occur when analyzing the energetics of a single-qubit gate generated by a resonant coherent field traveling in a waveguide. The correlations between the qubit and the field lead to bounds on the gate fidelity and a nontrivial energy balance. The experimental scheme involves continuous monitoring of the field through heterodyne detection and postselection based on the qubit's measurement outcomes.
Article
Quantum Science & Technology
Jongheon Lee, Yousung Kang, You-Seok Lee, Boheung Chung, Dooho Choi
Summary: In this study, we propose an efficient method for decomposing mixed polarity multiple controlled Toffoli (MPMCT) gates. By addressing the issues with previous techniques, our method achieves lower T-depth.
QUANTUM INFORMATION PROCESSING
(2023)
