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Live trends in quantum computing research, updated daily from arXiv.
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Hardware platform mentions in abstracts — Photonic leads
Toward dense QCD in quantum computers
A. Yamamoto·Nov 9, 2021
Lattice QCD at nonzero baryon density is a big challenge in hadron physics. In this presentation, I discuss the quantum computation of lattice gauge theory at nonzero density. I show some benchmark results of the Schwinger model obtained by the quant...
Multiqubit entanglement and quantum phase gates with epsilon-near-zero plasmonic waveguides
Ying Li, C. Argyropoulos·Nov 9, 2021
Multiqubit entanglement is extremely important to perform truly secure quantum optical communication and computing operations. However, the efficient generation of long-range entanglement over extended time periods between multiple qubits randomly di...
The Variational Quantum Eigensolver: A review of methods and best practices
J. Tilly, Hongxiang Chen, Shuxiang Cao +8 more·Nov 9, 2021
The variational quantum eigensolver (or VQE) uses the variational principle to compute the ground state energy of a Hamiltonian, a problem that is central to quantum chemistry and condensed matter physics. Conventional computing methods are constrain...
Scalable qubit representations of neutrino mixing matrices
M. J. Molewski, B. Jones·Nov 9, 2021
Oscillating neutrino beams exhibit quantum coherence over distances of thousands of kilometers. Their unambiguously quantum nature suggests an appealing test system for direct quantum simulation. Such techniques may enable presently analytically intr...
The Cost of Improving the Precision of the Variational Quantum Eigensolver for Quantum Chemistry
Ivana Miháliková, Matej Pivoluska, Martin Plesch +3 more·Nov 9, 2021
New approaches into computational quantum chemistry can be developed through the use of quantum computing. While universal, fault-tolerant quantum computers are still not available, and we want to utilize today’s noisy quantum processors. One of thei...
Average-Case Speedup for Product Formulas
Chi-Fang Chen, F. Brandão·Nov 9, 2021
Quantum simulation is a promising application of future quantum computers. Product formulas, or Trotterization, are the oldest and still remain an appealing method to simulate quantum systems. For an accurate product formula approximation, the state-...
Generalization in quantum machine learning from few training data
Matthias C. Caro, Hsin-Yuan Huang, M. Cerezo +4 more·Nov 9, 2021
Modern quantum machine learning (QML) methods involve variationally optimizing a parameterized quantum circuit on a training data set, and subsequently making predictions on a testing data set (i.e., generalizing). In this work, we provide a comprehe...
Demonstration of long-range correlations via susceptibility measurements in a one-dimensional superconducting Josephson spin chain
D. Tennant, X. Dai, Antonio J. Martinez +20 more·Nov 8, 2021
Spin chains have long been considered an effective medium for long-range interactions, entanglement generation, and quantum state transfer. In this work, we explore the properties of a spin chain implemented with superconducting flux circuits, design...
Optimal purification of a spin ensemble by quantum-algorithmic feedback
D. Jackson, Urs Haeusler, Leon Zaporski +7 more·Nov 8, 2021
We present a coherent quantum feedback algorithm to purify a mesoscopic spin ensemble at the ultimate level of a single spin. Applying it to a quantum dot narrowed nuclear-spin fluctuations by two orders of magnitude.
K-sparse Pure State Tomography with Phase Estimation
B. Gulbahar·Nov 8, 2021
Quantum state tomography (QST) for reconstructing pure states requires exponentially increasing resources and measurements with the number of qubits by using state-of-the-art quantum compressive sensing (CS) methods. In this article, QST reconstructi...
Hamiltonian Simulation with Random Inputs.
Qi Zhao, You Zhou, Alexander F. Shaw +2 more·Nov 8, 2021
The algorithmic error of digital quantum simulations is usually explored in terms of the spectral norm distance between the actual and ideal evolution operators. In practice, this worst-case error analysis may be unnecessarily pessimistic. To address...
Error Analysis of the Variational Quantum Eigensolver Algorithm
Sebastian Brandhofer, S. Devitt, I. Polian·Nov 8, 2021
Variational quantum algorithms have been one of the most intensively studied applications for near-term quantum computing applications. The noisy intermediate-scale quantum (NISQ) regime, where small enough algorithms can be run successfully on noisy...
Efficient realization of quantum algorithms with qudits
Anna Sergeevna Nikolaeva, E. Kiktenko, A. Fedorov·Nov 8, 2021
The development of a universal fault-tolerant quantum computer that can solve efficiently various difficult computational problems is an outstanding challenge for science and technology. In this work, we propose a technique for an efficient implement...
Large-N Chern insulators: Lattice field theory and quantum simulation approaches to correlation effects in the quantum anomalous Hall effect
L. Ziegler, E. Tirrito, M. Lewenstein +2 more·Nov 8, 2021
Four-Fermi quantum field theories in (2+1) dimensions lie among the simplest models in high-energy physics, the understanding of which requires a non-perturbative lattice formulation addressing their strongly-coupled fixed points. These lattice model...
ORQVIZ: Visualizing High-Dimensional Landscapes in Variational Quantum Algorithms
Manuel S. Rudolph, Sukin Sim, A. Raza +5 more·Nov 8, 2021
Variational Quantum Algorithms (VQAs) are promising candidates for finding practical applications of near to mid-term quantum computers. There has been an increasing effort to study the intricacies of VQAs, such as the presence or absence of barren p...
Transverse Mode-Encoded Quantum Gate on a Silicon Photonic Chip.
Lantian Feng, Ming Zhang, X. Xiong +10 more·Nov 8, 2021
As an important degree of freedom (d.o.f.) in photonic integrated circuits, the orthogonal transverse mode provides a promising and flexible way to increase communication capability, for both classical and quantum information processing. To construct...
Software mitigation of coherent two-qubit gate errors
L. Lao, A. Korotkov, Zhang Jiang +3 more·Nov 8, 2021
Two-qubit gates are important components of quantum computing. However, unwanted interactions between qubits (so-called parasitic gates) can be particularly problematic and degrade the performance of quantum applications. In this work, we present two...
Non-adiabatic Quantum Wavepacket Dynamics Simulation Based on Electronic Structure Calculations using the Variational Quantum Eigensolver
H. Hirai, Sho Koh·Nov 8, 2021
A non-adiabatic nuclear wavepacket dynamics simulation of the H$_2$O$^+$ de-excitation process is performed based on electronic structure calculations using the variational quantum eigensolver. The adiabatic potential energy surfaces and non-adiabati...
Partial randomized benchmarking
Kirill S. Dubovitskii, Yuriy Makhlin·Nov 7, 2021
In randomized benchmarking of quantum logical gates, partial twirling can be used for simpler implementation, better scaling, and higher accuracy and reliability. For instance, for two-qubit gates, single-qubit twirling is easier to realize than full...
Comparing two-qubit and multiqubit gates within the toric code
David Schwerdt, Yotam Shapira, T. Manovitz +1 more·Nov 7, 2021
In some quantum computing (QC) architectures, entanglement of an arbitrary number of qubits can be generated in a single operation. This property has many potential applications, and may specifically be useful for quantum error correction (QEC). Stab...