Article
Physics, Multidisciplinary
Holly N. Tinkey, Craig R. Clark, Brian C. Sawyer, Kenton R. Brown
Summary: In this study, we implemented a 2-qubit entangling interaction using a stationary, bichromatic optical beam within a surface-electrode Paul trap. We achieved a constant Doppler shift during the transport by fine temporal adjustment of the moving confinement potential. The interaction between the transported ions through the laser beam produced Bell states with fidelities comparable to those produced by stationary gates. This result demonstrates the feasibility of actively incorporating ion transport into quantum information entangling operations.
PHYSICAL REVIEW LETTERS
(2022)
Article
Quantum Science & Technology
Kaizhao Wang, Jing-Fan Yu, Pengfei Wang, Chunyang Luan, Jing-Ning Zhang, Kihwan Kim
Summary: This study proposes and investigates methods to speed up entangling operations in a trapped ions system with high fidelity. Firstly, a scheme to increase the speed of a two-qubit gate without being limited by the trap frequency is found. Secondly, a fast gate scheme for entangling more than two qubits simultaneously is studied, using the method of applying multiple frequency components on laser beams. Moreover, the effect of large excitation of motional mode beyond the limit of Lamb-Dicke approximation is carefully studied.
QUANTUM SCIENCE AND TECHNOLOGY
(2022)
Article
Optics
B. P. Ruzic, T. A. Barrick, J. D. Hunker, R. J. Law, B. K. McFarland, H. J. McGuinness, L. P. Parazzoli, J. D. Sterk, J. W. Van der Wall, D. Stick
Summary: In this paper, the impact of coherent motional excitation on the entangling-gate error in trapped-ion quantum computers is analyzed. The results show that a small amount of coherent displacement can erode gate performance, but this error can be suppressed by adjusting the relative phase or using Walsh modulation. Experimental data from transported ions is also used to analyze the impact of coherent displacement on gate error under realistic conditions.
Article
Physics, Multidisciplinary
Filippo M. Gambetta, Chi Zhang, Markus Hennrich, Igor Lesanovsky, Weibin Li
Summary: Conical intersections between electronic potential energy surfaces are crucial for studying nonadiabatic processes in the excited states of large molecules. By utilizing trapped Rydberg ions, these conical intersections can be engineered and their dynamics simulated on larger length and timescales, providing a highly controllable system. The presence of a conical intersection affects both nuclear and electronic dynamics, resulting in the inhibition of nuclear motion, and these effects can be monitored in real time through spectroscopic measurements.
PHYSICAL REVIEW LETTERS
(2021)
Article
Physics, Multidisciplinary
Y. Mei, Y. Li, H. Nguyen, P. R. Berman, A. Kuzmich
Summary: Researchers have created a special two-level system in an ensemble of several hundred atoms and observed oscillations between the ground state and collective Rydberg state. They have also obtained the light shifts of the qubits using interference techniques and derived an effective two-level model that agrees well with their observations.
PHYSICAL REVIEW LETTERS
(2022)
Article
Quantum Science & Technology
Lukas Gerster, Fernando Martinez-Garcia, Pavel Hrmo, Martin W. van Mourik, Benjamin Wilhelm, Davide Vodola, Markus Mueller, Rainer Blatt, Philipp Schindler, Thomas Monz
Summary: An efficient calibration protocol has been developed and characterized to automatically estimate and adjust experimental parameters of the widely used two-qubit Molmer-Sorensen entangling gate operation in a trapped-ion quantum information processor, leading to a significant speedup in gate calibration procedure.
Article
Quantum Science & Technology
Reinhold Blumel, Nikodem Grzesiak, Neal Pisenti, Kenneth Wright, Yunseong Nam
Summary: Researchers have proposed a linear method to construct entangling gates on trapped-ion quantum computers. This method does not require any search in the parameter space, can achieve power-optimal gates, and can be stabilized at an arbitrary order.
NPJ QUANTUM INFORMATION
(2021)
Article
Quantum Science & Technology
R. Ohira, S. Kume, H. Takahashi, K. Toyoda
Summary: The study experimentally observed the dynamics of a single polariton and two polaritons in a two-ion chain, demonstrating the suppression of polariton hopping in the anti-Jaynes-Cummings-Hubbard model. This work represents a significant step towards the development of a trapped-ion based quantum simulator for strongly interacting polaritonic systems.
QUANTUM SCIENCE AND TECHNOLOGY
(2021)
Article
Multidisciplinary Sciences
Julian Heckoetter, Valentin Walther, Stefan Scheel, Manfred Bayer, Thomas Pohl, Marc Assmann
Summary: Researchers demonstrated the generation and control of strong exciton interactions in cuprous oxide semiconductors by producing two distinct quantum states of Rydberg excitons through two-color pump-probe experiments. This led to the emergence of strong spatial correlations and an inter-state Rydberg blockade over remarkably large distances. The semiconductor excitons exhibited universal properties dependent on the interaction potential shape, indicating vastly extended-range and power-law character.
NATURE COMMUNICATIONS
(2021)
Article
Physics, Multidisciplinary
Shiqing Tang, Chong Yang, Dongxiao Li, Xiaoqiang Shao
Summary: In this study, a scheme for rapidly implementing a three-atom Rydberg CCZ gate via a single pulse is proposed, using the Rydberg blockade effect. This gate is successfully applied to quantum algorithms like the Deutsch-Jozsa algorithm and Grover search. The logical states of the gate are encoded to avoid spontaneous emission effects, and individual addressing of atoms is not required in this protocol.
Article
Physics, Multidisciplinary
Jin-Lei Wu, Yan Wang, Jin-Xuan Han, Shi-Lei Su, Yan Xia, Yongyuan Jiang, Jie Song
Summary: A dynamics regime of Rydberg atoms called unselective ground-state blockade (UGSB) is proposed to implement a one-step SWAP gate without individual addressing of atoms in the context of Rydberg antiblockade (RAB). This work modifies the RAB condition to achieve a dynamical and robust SWAP gate, and further investigates the implementation of a three-atom Fredkin gate based on the proposed SWAP gates.
FRONTIERS OF PHYSICS
(2022)
Article
Optics
Chi-En Wu, Teodora Kirova, Marcis Auzins, Yi-Hsin Chen
Summary: In this theoretical study, the enhancement of the Rydberg blockade radius using Forster resonance is presented. The investigation reveals that significant differences in the principal quantum numbers of two Rydberg states can substantially improve the blockade radius, exceeding 50 μm.
Review
Physics, Multidisciplinary
Zhengyang Cai, Chun -Yang Luan, Lingfeng Ou, Hengchao Tu, Zihan Yin, Jing -Ning Zhang, Kihwan Kim
Summary: The trapped-ion system has long been a leading platform for practical quantum computation and simulation. Quantum gates with trapped ions are known for their high fidelity. Recent advancements have focused on developing sophisticated schemes for quantum gates, such as modulation techniques, to improve speed, robustness, and applicability to multiple qubits.
JOURNAL OF THE KOREAN PHYSICAL SOCIETY
(2023)
Article
Optics
Donghwa Lee, Tanumoy Pramanik, Seongjin Hong, Young-Wook Cho, Hyang-Tag Lim, Seungbeom Chin, Yong-Su Kim
Summary: This work proposes schemes to generate two fundamental classes of genuine tripartite entanglement using linear optics and demonstrates their experimental feasibility with three identical photons. The results support the prediction that particle indistinguishability is a fundamental element for entangling identical particles.
Article
Physics, Multidisciplinary
Wentao Chen, Yao Lu, Shuaining Zhang, Kuan Zhang, Guanhao Huang, Mu Qiao, Xiaolu Su, Jialiang Zhang, Jing-Ning Zhang, Leonardo Banchi, M. S. Kim, Kihwan Kim
Summary: A minimal-loss programmable phononic network is demonstrated, which can deterministically prepare and detect any phononic state. The network can be extended to reveal quantum advantage and has high reconstruction fidelities for both single- and two-phonon states.
Article
Optics
Jing Qiu, Zhiping Wang, Dongsheng Ding, Weibin Li, Benli Yu
Article
Physics, Multidisciplinary
F. M. Gambetta, W. Li, F. Schmidt-Kaler, I Lesanovsky
PHYSICAL REVIEW LETTERS
(2020)
Article
Physics, Multidisciplinary
Ryan Jones, Giuseppe Buonaiuto, Ben Lang, Igor Lesanovsky, Beatriz Olmos
PHYSICAL REVIEW LETTERS
(2020)
Article
Multidisciplinary Sciences
Chi Zhang, Fabian Pokorny, Weibin Li, Gerard Higgins, Andreas Poschl, Igor Lesanovsky, Markus Hennrich
Article
Optics
Dong Yan, Binbin Wang, Zhengyang Bai, Weibin Li
Article
Physics, Multidisciplinary
Yongqiang Li, Han Cai, Da-wei Wang, Lin Li, Jianmin Yuan, Weibin Li
PHYSICAL REVIEW LETTERS
(2020)
Article
Optics
G. Buonaiuto, I Lesanovsky, B. Olmos
Summary: In this theoretical investigation, we studied the feedback control of a laser-driven one-dimensional atomic chain interfaced with a nanofiber. By measuring guided light through photon counting or homodyne detection, the system's statistics can be controlled. The feedback scheme allows enhancement of photon counting rate and fluctuations, and alteration of the many-body state of the atom chain, providing insights on dynamics in light-matter networks with experimental setups.
JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS
(2021)
Article
Optics
B. Olmos, C. Liedl, I Lesanovsky, P. Schneeweiss
Summary: The research investigates light scattering from an array of atoms into the guided modes of a waveguide, finding an enhanced scattering phenomenon and a modified Bragg condition. Different parameter regimes are identified for the scattering rate dependence on the atom number, and the findings are shown to be independent of the asymmetry of the atom-light coupling.
Article
Physics, Fluids & Plasmas
Luke Causer, Igor Lesanovsky, Mari Carmen Banuls, Juan P. Garrahan
Article
Optics
B. Olmos, G. Buonaiuto, P. Schneeweiss, I Lesanovsky
Article
Physics, Multidisciplinary
Michele Burrello, Igor Lesanovsky, Andrea Trombettoni
PHYSICAL REVIEW RESEARCH
(2020)
Article
Optics
Andreas Kouzelis, Katarzyna Macieszczak, Jiri Minar, Igor Lesanovsky
Article
Physics, Multidisciplinary
Eliana Fiorelli, Pietro Rotondo, Federico Carollo, Matteo Marcuzzi, Igor Lesanovsky
PHYSICAL REVIEW RESEARCH
(2020)
Article
Optics
Yijia Zhou, Igor Lesanovsky, Thomas Fernholz, Weibin Li