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
Lu Qi, Evan C. Reed, Kenneth R. Brown
Summary: Control of the external degree of freedom is crucial for the applications of trapped molecular ions in spectroscopy, precision measurements, and quantum information technology. In this study, we demonstrate near ground-state cooling of axial motional modes of a calcium mono-oxide ion through sympathetic sideband cooling with a cotrapped calcium ion. We also observe that the phonon state of the axial out-of-phase mode of the ion chain remains unchanged while the mode frequency is adiabatically ramped up and/or down, which is essential for investigating the proposed molecular dipole-phonon interaction.
Article
Chemistry, Physical
Rong Duan, Joseph N. Mastron, Yin Song, Kevin J. Kubarych
Summary: Strong coupling between vibrational transitions in molecules within a resonant optical microcavity leads to the formation of collective, delocalized vibrational polaritons. The polaritonic chemistry has many potential applications, but one challenge is removing background contribution due to uncoupled molecules in order to obtain the polaritonic response.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2021)
Article
Optics
K. Sosnova, A. Carter, C. Monroe
Summary: For high-fidelity entangling gates based on transverse modes for mixed-species ion chains with large mass ratio, the laser power required is at least an order of magnitude higher than that for gates based on axial modes. Additionally, even with moderate mass differences, the transverse modes are much harder to cool than the axial modes.
Article
Multidisciplinary Sciences
Cornelis J. van Diepen, Tzu-Kan Hsiao, Uditendu Mukhopadhyay, Christian Reichl, Werner Wegscheider, Lieven M. K. Vandersypen
Summary: The study demonstrates electron cascade phenomenon induced by Coulomb repulsion in a quantum dot array, transmitting information like toppling dominoes far beyond the direct Coulomb repulsion range. The combination of cascade effect with Pauli spin blockade technology can potentially lead to high-fidelity results in reading distant spins in quantum dot arrays.
NATURE COMMUNICATIONS
(2021)
Article
Nanoscience & Nanotechnology
Mohit Kumar, Jiyeong Park, Junmo Kim, Hyungtak Seo
Summary: Research demonstrates that a conformal nanolaminate HfO2/ZrO2 structure on silicon enables high-performing tunneling effects at room temperature, exhibiting high endurance and negative differential resistance. These findings pave the way for in-material neural data processing and the development of next-generation neural logic computing systems.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Chemistry, Multidisciplinary
Eugenia Pyurbeeva, Chunwei Hsu, David Vogel, Christina Wegeberg, Marcel Mayor, Herre van der Zant, Jan A. Mol, Pascal Gehring
Summary: Single molecules can reveal the presence of microscopic electron transfer dynamics through entropy measurement, and thermoelectric measurement can uncover spin transitions in the redox states of a molecule in a magnetic field. The power of thermoelectric measurements lies in determining the difference in configurational entropy between redox states of a nanoscale system without prior assumptions about its structure or dynamics.
Article
Materials Science, Multidisciplinary
Samuel L. Rudge, Yaling Ke, Michael Thoss
Summary: This article introduces an approach to calculating current-induced forces in charge transport through nanosystems. By starting from the fully quantum mechanical hierarchical equations of motion formalism, a classical Langevin equation of motion for the vibrational dynamics influenced by current-induced forces is derived through a timescale separation between electronic and vibrational degrees of freedom, such as electronic friction. The numerical exactness of the hierarchical equations of motion approach allows for the investigation of transport scenarios with strong intrasystem and system-environment interactions. As a demonstration, the electronic friction of three example systems is calculated and analyzed: a single electronic level coupled to one classical vibrational mode, an Anderson impurity model coupled to one classical vibrational mode, and a single electronic level coupled to both a classical and quantum vibrational mode.
Article
Chemistry, Multidisciplinary
Mohamed Nabeel Mattath, Debasis Ghosh, Chunyan Dong, Thimmaiah Govindaraju, Shuo Shi
Summary: Boolean operations based on DNA have promising applications in biocomputing. By introducing parity generator and parity checker, bit errors can be effectively evaluated. In this study, a DNA hybrid architecture platform was constructed using a chemosensing ensemble and a binary to gray code encoder was used to convert the transmitted and received data into secure information.
MATERIALS HORIZONS
(2022)
Article
Materials Science, Multidisciplinary
David W. Kanaar, Utkan Gungordu, J. P. Kestner
Summary: In this study, a deep neural network is utilized to optimize two-qubit gates against charge noise errors and crosstalk. The results show that this approach can effectively improve the accuracy of two-qubit gates in different scenarios.
Article
Multidisciplinary Sciences
Ensar Vahapoglu, James P. Slack-Smith, Ross C. C. Leon, Wee Han Lim, Fay E. Hudson, Tom Day, Tuomo Tanttu, Chih Hwan Yang, Arne Laucht, Andrew S. Dzurak, Jarryd J. Pla
Summary: Spin-based silicon quantum electronic circuits offer a scalable platform for quantum computation by combining the manufacturability of semiconductor devices with long coherence times of spins in silicon, allowing for control signals to be simultaneously delivered to millions of qubits.
Article
Physics, Multidisciplinary
Cheng Sheng, Jiayi Hou, Xiaodong He, Kunpeng Wang, Ruijun Guo, Jun Zhuang, Bahtiyar Mamat, Peng Xu, Min Liu, Jin Wang, Mingsheng Zhan
Summary: This study reports the first demonstration of two-dimensional dual-species atom assembly, achieved by rearranging initially randomly distributed atoms using a sorting algorithm and optical trapping technique. The resulting atom arrays have user-defined geometries and specific species ratios, making them highly attractive for applications in high-fidelity quantum logic, many-body quantum simulation, and single molecule array formation.
PHYSICAL REVIEW LETTERS
(2022)
Article
Chemistry, Physical
Daniel Finkelstein-Shapiro, Pierre-Adrien Mante, Sinan Balci, Donatas Zigmantas, Tonu Pullerits
Summary: In polaritons, the properties of matter are modified by mixing molecular transitions with light modes, leading to hybrid light-matter states and modified exciton dynamics. This article rigorously derives non-Hermitian Hamiltonians in the response function formalism of nonlinear spectroscopy and explores spectroscopic signatures of plexcitons. The study reveals interference and Rabi splitting in linear spectroscopy and a qualitative change in the symmetry of the line shape of the nonlinear signal when crossing the exceptional point.
JOURNAL OF CHEMICAL PHYSICS
(2023)
Article
Engineering, Electrical & Electronic
Shu Cheng, Yusong Hu, Chaoqun Xiang, Jiawen Liu, Xun Wu, Jun Yao
Summary: This article proposes an online condition monitoring method for IGBTs that utilizes the Miller voltage plateau to estimate junction temperature and eliminates the influence of collector current on the estimation. A reverse current phase measuring strategy is employed to achieve this, and the characteristics of the trigger voltage are analyzed to recognize fault types. Experimental results demonstrate the high sensitivity and good linearity of the proposed method.
IEEE TRANSACTIONS ON TRANSPORTATION ELECTRIFICATION
(2022)
Article
Nanoscience & Nanotechnology
Xin Zhang, Yaohui Cheng, Jingxuan You, Jinming Zhang, Yirong Wang, Jun Zhang
Summary: The article describes the development of a new type of biopolymer-based phosphorescent materials that have excellent processability and irreversible humidity-responsiveness by introducing the imidazolium cation to the cellulose chain.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Chemistry, Physical
Mudit Sinhal, Anatoly Johnson, Stefan Willitsch
Summary: This article presents a robust approach for precise spectroscopic experiments using mid-infrared quantum-cascade lasers (QCLs) that simultaneously achieve linewidth narrowing, frequency stabilization, and absolute frequency referencing. The technology has the potential to advance studies in precision spectroscopy and quantum technologies.
Article
Physics, Multidisciplinary
Ze-Liang Xiang, Diego Gonzalez Olivares, Juan Jose Garcia-Ripoll, Peter Rabl
Summary: We study the implementation of arbitrary excitation-conserving linear transformations between two sets of N stationary bosonic modes connected by a photonic quantum channel. We prove the feasibility of implementing this transfer with high fidelity and achieving a predetermined N x N unitary transformation between the two sets of modes using a set of control pulses. The presented scheme, which is purely control-based and hardware-independent, is highly flexible and has wide applications in areas such as boson sampling experiments, multiqubit state transfer protocols, and continuous-variable quantum computing architectures.
PHYSICAL REVIEW LETTERS
(2023)
Article
Physics, Multidisciplinary
Pablo Diez-Valle, Diego Porras, Juan Jose Garcia-Ripoll
Summary: In this paper, we provide analytical and numerical evidence that the single-layer quantum approximate optimization algorithm on universal Ising spin models produces thermal-like states. We find that these pseudo-Boltzmann states cannot be efficiently simulated on classical computers according to the general state-of-the-art condition that ensures rapid mixing for Ising models. Moreover, we observe that the temperature depends on a hidden universal correlation between the energy of a state and the covariance of other energy levels and the Hamming distances of the state to those energies.
PHYSICAL REVIEW LETTERS
(2023)
Article
Chemistry, Physical
Richard Karl, Yanning Yin, Stefan Willitsch
Summary: Hybrid traps, which combine different types of external fields, have become important tools for studying interactions between neutral particles and ions at low temperatures. This study uses molecular-dynamics simulations to investigate the effect of a strongly inhomogeneous magnetic field on the trapping and laser cooling of a single Ca+ ion in a radiofrequency trap. The results show that laser cooling is still effective despite the ion experiencing different magnetic field strengths and directions along its trajectory. Offsettting the centers of the two traps creates a linear magnetic-field gradient, requiring multiple lasers to address the resulting Zeeman splittings for efficient cooling.
Article
Quantum Science & Technology
H. Espinos, I Panadero, J. J. Garcia-Ripoll, E. Torrontegui
Summary: We analyze the implementation of a fast nonadiabatic CZ gate between two tunable coupling transmon qubits. The gate is based on a theory of dynamical invariants, which reduces leakage and enhances robustness against decoherence. By modifying the protocol to account for higher-order perturbative corrections, the gate achieves a significantly higher fidelity than other quasiadiabatic protocols and approaches the theoretical limit in gate time.
QUANTUM SCIENCE AND TECHNOLOGY
(2023)
Article
Physics, Atomic, Molecular & Chemical
Trevor Scheuing, Jesus Perez-Rios
Summary: This work presents a theoretical approach for describing the lineshapes of Rydberg excitations in high-density media. It introduces the quasi-static lineshape theory, providing a systematic and general method, and examines its validity. The role of thermal atoms and core-perturber interactions, which are typically ignored in Rydberg physics, is discussed using 84Sr as an example. The study also characterizes the impact of Rydberg-core perturber interactions based on density and principal quantum number, which not only affects the lineshape but also potentially applies to chemi-ionization reactions responsible for the decay of Rydberg atoms in high-density media.
Review
Computer Science, Artificial Intelligence
Anna Cascarano, Jordi Mur-Petit, Jeronimo Hernandez-Gonzalez, Marina Camacho, Nina de Toro Eadie, Polyxeni Gkontra, Marc Chadeau-Hyam, Jordi Vitria, Karim Lekadir
Summary: Exploiting existing longitudinal data cohorts can bring enormous benefits to the medical field, as many diseases have a complex and multi-factorial time-course, and start to develop long before symptoms appear. Machine learning techniques for longitudinal biomedical data can assist clinicians in various aspects, but the development of suitable models poses challenges due to the heterogeneity and complexity of the data. This paper provides a comprehensive review of recent developments and applications in machine learning for longitudinal biomedical data.
ARTIFICIAL INTELLIGENCE REVIEW
(2023)
Article
Physics, Multidisciplinary
Nahid Yazdi, Juan Jose Garcia-Ripoll, Diego Porras, Carlos Navarrete-Benlloch
Summary: We demonstrate the dissipative engineering of arbitrary Gaussian states for a set of bosonic modes using lossy multichromatic modulated qubits. Our approach is particularly applicable to superconducting-circuit architectures that have all the necessary experimental ingredients. The generation of such multimode Gaussian states is crucial for various applications, especially in measurement-based quantum computation. We address the challenges of extending previous proposals to many bosonic modes and provide solutions to overcome limitations and hurdles.
NEW JOURNAL OF PHYSICS
(2023)
Article
Physics, Applied
R. Dassonneville, T. Ramos, V. Milchakov, C. Mori, L. Planat, F. Foroughi, C. Naud, W. Hasch-Guichard, J. J. Garcia-Ripoll, N. Roch, O. Buisson
Summary: In this study, we demonstrate a method for reading out the state of a transmon qubit using polaritonic meters that exhibit nonlinear response. The readout is performed in the mesoscopic regime with low power, and is highly sensitive to relaxation errors of the qubit.
PHYSICAL REVIEW APPLIED
(2023)
Article
Quantum Science & Technology
Pablo Diez-Valle, Jorge Luis-Hita, Senaida Hernandez-Santana, Fernando Martinez-Garcia, Alvaro Diaz-Fernandez, Eva Andres, Juan Jose Garcia-Ripoll, Escolastico Sanchez-Martinez, Diego Porras
Summary: In this paper, we propose a new method for solving combinatorial optimization problems with challenging constraints using Variational Quantum Algorithms (VQAs). We introduce the Multi-Objective Variational Constrained Optimizer (MOVCO) which updates the variational parameters by a classical multi-objective optimization performed by a genetic algorithm. We test this method on a real-world problem in finance and show significant improvement in terms of cost and the avoidance of local minima that do not satisfy mandatory constraints.
QUANTUM SCIENCE AND TECHNOLOGY
(2023)
Article
Quantum Science & Technology
Guillermo F. Penas, Ricardo Puebla, Juan Jose Garcia-Ripoll
Summary: This paper proposes a correction strategy to improve quantum state transfer protocols by addressing the issues of wavepacket distortion and non-Markovian effects. The theoretical results are supported by numerical simulations, showing that the proposed strategy can significantly improve state transfer fidelities.
QUANTUM SCIENCE AND TECHNOLOGY
(2023)
Article
Quantum Science & Technology
Aleksandr Shlykov, Mikolaj Roguski, Stefan Willitsch
Summary: This study examines optimized strategies for the preparation of single molecular ions in well-defined rotational quantum states in an ion trap with the example of the molecular nitrogen ion N2+$_2<^>+$. It proposes a two-step approach of threshold-photoionization and measurement-based state purification to produce ground-state N2+$_2<^>+$ ions. By discarding ions not in the target state, state-pure samples of single N2+$_2<^>+$ ions can be generated for further experiments.
ADVANCED QUANTUM TECHNOLOGIES
(2023)
Article
Optics
E. Altozano, J. Berrocal, S. Lohse, F. Dominguez, M. Block, J. J. Garcia-Ripoll, D. Rodriguez
Summary: The novel application of a piezoelectric quartz resonator for the detection of trapped ions has enabled the observation of the quartz-ions interaction under nonequilibrium conditions, opening new perspectives for high-sensitive motional frequency measurements of radioactive particles.
Article
Chemistry, Physical
Xabier Garcia-Andrade, Pablo Garcia Tahoces, Jesus Perez-Rios, Emilio Martinez Nunes
Summary: Different machine learning models, including multitask deep neural network, XGBoost with gradient-boosted trees, and Gaussian process regression, are proposed to predict density functional theory-quality barrier heights from semiempirical quantum mechanical calculations. The obtained mean absolute errors are comparable to previous models with the same number of data points. These ML corrections can be useful for rapidly screening large reaction networks in combustion chemistry or astrochemistry. Additionally, our results indicate that 70% of the features with the highest impact on the model output are bespoke predictors, which can be utilized by future Delta-ML models to improve the quantitative prediction of other reaction properties.
JOURNAL OF PHYSICAL CHEMISTRY A
(2023)
Article
Chemistry, Multidisciplinary
Mahmoud A. E. Ibrahim, X. Liu, J. Perez-Rios
Summary: A machine-learning approach based on atomic properties is proposed for predicting spectroscopic constants, achieving high accuracy within a certain range and enabling classification of diatomic molecules.
