Papers
Live trends in quantum computing research, updated daily from arXiv.
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Qubit Platforms
Hardware platform mentions in abstracts — Photonic leads
Hardware-Efficient Quantum Random Access Memory with Hybrid Quantum Acoustic Systems.
Connor T. Hann, Chang-ling Zou, Yaxing Zhang +4 more·Jun 27, 2019
Hybrid quantum systems in which acoustic resonators couple to superconducting qubits are promising quantum information platforms. High quality factors and small mode volumes make acoustic modes ideal quantum memories, while the qubit-phonon coupling ...
Logistic Network Design with a D-Wave Quantum Annealer
Yongcheng Ding, Xi Chen, L. Lamata +2 more·Jun 24, 2019
Logistic network design is an abstract optimization problem which, under the assumption of minimal cost, determines the optimal configuration of infrastructures and facilities of the supply chain based on customer demand. With the solutions at hand, ...
Quantum Annealing: a journey through Digitalization, Control, and hybrid Quantum Variational schemes
G. Mbeng, R. Fazio, G. Santoro·Jun 21, 2019
We establish and discuss a number of connections between a digitized version of Quantum Annealing (QA) with the Quantum Approximate Optimization Algorithm (QAOA) introduced by Farhi et al. (arXiv:1411.4028) as an alternative hybrid quantum-classical ...
Variational Quantum Fidelity Estimation
M. Cerezo, Alexander Poremba, L. Cincio +1 more·Jun 21, 2019
Computing quantum state fidelity will be important to verify and characterize states prepared on a quantum computer. In this work, we propose novel lower and upper bounds for the fidelity F(ρ,σ) based on the ``truncated fidelity'' F(ρm,σ), which is e...
Hybrid Quantum/Classical Derivative Theory: Analytical Gradients and Excited-State Dynamics for the Multistate Contracted Variational Quantum Eigensolver
R. Parrish, E. Hohenstein, P. McMahon +1 more·Jun 20, 2019
The maturation of analytical derivative theory over the past few decades has enabled classical electronic structure theory to provide accurate and efficient predictions of a wide variety of observable properties. However, classical implementations of...
Generation of hybrid maximally entangled states in a one-dimensional quantum walk
A. Gratsea, M. Lewenstein, A. Dauphin·Jun 20, 2019
We study the generation of hybrid entanglement in a one-dimensional quantum walk. In particular, we explore the preparation of maximally entangled states between position and spin degrees of freedom. We address it as an optimization problem, where th...
High-fidelity single-qubit gates in a strongly driven quantum-dot hybrid qubit with1/fcharge noise
Yuan-Chi Yang, S. Coppersmith, M. Friesen·Jun 19, 2019
Semiconductor double quantum dot hybrid qubits are promising candidates for high-fidelity quantum computing. However, their performance is limited by charge noise, which is ubiquitous in solid-state devices, and phonon-induced dephasing. Here we expl...
Digital-analog quantum algorithm for the quantum Fourier transform
Ana Martin, L. Lamata, E. Solano +1 more·Jun 18, 2019
Quantum computers will allow calculations beyond existing classical computers. However, current technology is still too noisy and imperfect to construct a universal digital quantum computer with quantum error correction. Inspired by the evolution of ...
Generation of thermofield double states and critical ground states with a quantum computer
D. Zhu, S. Johri, N. Linke +7 more·Jun 6, 2019
Significance Our experiment prepares two types of nontrivial quantum states on a trapped ion quantum computer: the thermofield double state of the transverse-field Ising model at arbitrary temperature and the quantum critical state of the zero-temper...
Coherent electrical control of a single high-spin nucleus in silicon
Serwan Asaad, V. Mourik, Benjamin Joecker +12 more·Jun 3, 2019
Nuclear spins are highly coherent quantum objects. In large ensembles, their control and detection via magnetic resonance is widely exploited, for example, in chemistry, medicine, materials science and mining. Nuclear spins also featured in early pro...
Expressibility and Entangling Capability of Parameterized Quantum Circuits for Hybrid Quantum‐Classical Algorithms
Sukin Sim, Peter D. Johnson, Alán Aspuru-Guzik·May 26, 2019
Parameterized quantum circuits (PQCs) play an essential role in the performance of many variational quantum algorithms. One challenge in implementing such algorithms is choosing an effective circuit that well represents the solution space while maint...
Error correction schemes for fully correlated quantum channels protecting both quantum and classical information
Chi-Kwong Li, Seth Lyles, Y. Poon·May 24, 2019
We study efficient quantum error correction schemes for the fully correlated channel on an n-qubit system with error operators that assume the form σx⊗n\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \use...
Multistart Methods for Quantum Approximate optimization
Ruslan Shaydulin, Ilya Safro, Jeffrey Larson·May 21, 2019
Hybrid quantum-classical algorithms such as the quantum approximate optimization algorithm (QAOA) are considered one of the most promising approaches for leveraging near-term quantum computers for practical applications. Such algorithms are often imp...
Demonstration of Adiabatic Variational Quantum Computing with a Superconducting Quantum Coprocessor.
Ming-Cheng Chen, M. Gong, Xiaosi Xu +15 more·May 8, 2019
Adiabatic quantum computing enables the preparation of many-body ground states. Realization poses major experimental challenges: Direct analog implementation requires complex Hamiltonian engineering, while the digitized version needs deep quantum gat...
Efficient Quantum Gates for Individual Nuclear Spin Qubits by Indirect Control.
Swathi S. Hegde, Jingfu Zhang, D. Suter·May 5, 2019
Hybrid quantum registers, such as electron-nuclear spin systems, have emerged as promising hardware for implementing quantum information and computing protocols in scalable systems. Nevertheless, the coherent control of such systems still faces chall...
Scalable Majorana vortex modes in iron-based superconductors
Ching-Kai Chiu, T. Machida, Yingyi Huang +2 more·Apr 30, 2019
A simulation study with experimental data analysis shows the presence of multiple Majorana modes in iron-based superconductors. The iron-based superconductor FeTexSe1−x is one of the material candidates hosting Majorana vortex modes residing in the v...
Quantum-assisted associative adversarial network: applying quantum annealing in deep learning
M. Wilson, Thomas Vandal, T. Hogg +1 more·Apr 23, 2019
Generative models have the capacity to model and generate new examples from a dataset and have an increasingly diverse set of applications driven by commercial and academic interest. In this work, we present an algorithm for learning a latent variabl...
Quantum-Assisted Clustering Algorithms for NISQ-Era Devices
S. Mendelson, Robert W. Strand, IV GuyB.Oldaker +1 more·Apr 18, 2019
In the NISQ-era of quantum computing, we should not expect to see quantum devices that provide an exponential improvement in runtime for practical problems, due to the lack of error correction and small number of qubits available. Nevertheless, these...
Toward large-scale fault-tolerant universal photonic quantum computing
S. Takeda, A. Furusawa·Apr 16, 2019
Photonic quantum computing is one of the leading approaches to universal quantum computation. However, large-scale implementation of photonic quantum computing has been hindered by its intrinsic difficulties, such as probabilistic entangling gates fo...
Toward convergence of effective field theory simulations on digital quantum computers
Omar Shehab, K. Landsman, Y. Nam +5 more·Apr 9, 2019
We report results for simulating an effective field theory to compute the binding energy of the deuteron nucleus using a hybrid algorithm on a trapped-ion quantum computer. Two increasingly complex unitary coupled-cluster ansaetze have been used to c...