Papers
Live trends in quantum computing research, updated daily from arXiv.
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15,669 papers in 12 months (-39% vs prior quarter)
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Qubit Platforms
Hardware platform mentions in abstracts — Photonic leads
Fast spin-valley-based quantum gates in Si with micromagnets
Peihao Huang, Xuedong Hu·Oct 28, 2020
An electron spin qubit in silicon quantum dots holds promise for quantum information processing due to the scalability and long coherence. An essential ingredient to recent progress is the employment of micromagnets. They generate a synthetic spin–or...
Simulation of quantum computing on classical supercomputers with tensor-network edge cutting
Yaqian Zhao, Rengang Li, Jinzhe Jiang +6 more·Oct 28, 2020
Simulation of quantum computing on supercomputers is a significant research topic, which plays a vital role in quantum algorithm verification, error-tolerant verification and other applications. Tensor network contraction based on density matrix is a...
Solving generalized eigenvalue problems by ordinary differential equations on a quantum computer
Changpeng Shao, Jin-Peng Liu·Oct 28, 2020
Many eigenvalue problems arising in practice are often of the generalized form Ax=λBx. One particularly important case is symmetric, namely A,B are Hermitian and B is positive definite. The standard algorithm for solving this class of eigenvalue prob...
Nonlinear signal distortion corrections through quantum sensing
K. Chaves, Xian Wu, Y. Rosen +1 more·Oct 27, 2020
Having accurate gate generation is essential for precise control of a quantum system. The generated gate usually suffers from linear and nonlinear distortion. Previous works have demonstrated how to use a qubit to correct linear frequency distortions...
Hybridization mechanism of the dual proximity effect in superconductor–topological insulator interfaces
N. Sedlmayr, A. Levchenko·Oct 27, 2020
In this communication we consider generalities of the proximity effect in a contact between a conventional $s$-wave superconductor (S) nano-island and a thin film of a topological insulator (TI). A local hybridization coupling mechanism is considered...
U(1)-symmetric recurrent neural networks for quantum state reconstruction
Stewart Morawetz, Isaac J. S. De Vlugt, J. Carrasquilla +1 more·Oct 27, 2020
Generative models are a promising technology for the enhancement of quantum simulators. These machine learning methods are capable of reconstructing a quantum state from experimental measurements, and can aid in the calculation of physical observable...
A flux tunable superconducting quantum circuit based on Weyl semimetal MoTe2
K. Chiu, D. Qian, J. Qiu +7 more·Oct 27, 2020
Weyl semimetals for their exotic topological properties have drawn considerable attention in many research fields. When in combination with s-wave superconductors, the supercurrent can be carried by their topological surface channels, forming junctio...
Deterministic multi-mode gates on a scalable photonic quantum computing platform
M. V. Larsen, Xueshi Guo, Casper R. Breum +2 more·Oct 27, 2020
Quantum computing can be realized with numerous different hardware platforms and computational protocols. A highly promising, and potentially scalable, idea is to combine a photonic platform with measurement-induced quantum information processing. In...
Group theory on quantum Boltzmann machine
Hai-jing Song, Duan-Lu Zhou·Oct 27, 2020
Group theory is extremely successful in characterizing the symmetries in quantum systems, which greatly simplifies and unifies our treatments of quantum systems. Here we introduce the concept of the symmetry for a quantum Boltzmann machine and develo...
Benchmarking the variational quantum eigensolver through simulation of the ground state energy of prebiotic molecules on high-performance computers
P. Lolur, M. Rahm, M. Skogh +2 more·Oct 26, 2020
We use the Variational Quantum Eigensolver (VQE) as implemented in the Qiskit software package to compute the ground state energy of small molecules derived from water, H$_2$O, and hydrogen cyanide, HCN. The work aims to benchmark algorithms for calc...
Generation and storage of spin squeezing via learning-assisted optimal control
Q. Tan, Mao Zhang, Yu Chen +2 more·Oct 26, 2020
The generation and storage of spin squeezing is an attractive topic in quantum metrology and the foundation of quantum mechanics. The major models to realize the spin squeezing are the one- and two-axis twisting models. Here, we consider a collective...
Quantum semi-supervised generative adversarial network for enhanced data classification
Kouhei Nakaji, N. Yamamoto·Oct 26, 2020
In this paper, we propose the quantum semi-supervised generative adversarial network (qSGAN). The system is composed of a quantum generator and a classical discriminator/classifier (D/C). The goal is to train both the generator and the D/C, so that t...
Twirling and Hamiltonian Engineering via Dynamical Decoupling for GKP Quantum Computing
J. Conrad·Oct 26, 2020
I introduce an energy constrained approximate twirling operation that can be used to diagonalize effective logical channels in GKP quantum error correction, project states into the GKP code space and construct a dynamical decoupling sequence with fas...
Decentralizing Feature Extraction with Quantum Convolutional Neural Network for Automatic Speech Recognition
Chao-Han Huck Yang, Jun Qi, Samuel Yen-Chi Chen +4 more·Oct 26, 2020
We propose a novel decentralized feature extraction approach in federated learning to address privacy-preservation issues for speech recognition. It is built upon a quantum convolutional neural network (QCNN) composed of a quantum circuit encoder for...
Blind oracular quantum computation
Cica Gustiani, D. DiVincenzo·Oct 26, 2020
In the standard oracle model, an oracle efficiently evaluates an unknown classical function independent of the quantum algorithm itself. Quantum algorithms have a complex interrelationship to their oracles; for example the possibility of quantum spee...
Penalty methods for a variational quantum eigensolver
Kohdai Kuroiwa, Yuya O. Nakagawa·Oct 26, 2020
The variational quantum eigensolver (VQE) is a promising algorithm to compute eigenstates and eigenenergies of a given quantum system that can be performed on a near-term quantum computer. Obtaining eigenstates and eigenenergies in a specific symmetr...
The Effect of the Pauli Spin Matrices on the Quantum Lattice Algorithm for Maxwell Equations in Inhomogeneous Media
G. Vahala, L. Vahala, M. Soe +1 more·Oct 23, 2020
A quantum lattice algorithm (QLA) is developed for the solution of Maxwell equations in scalar dielectric media using the Riemann-Silberstein representation. For x-dependent and y-dependent inhomogeneities, the corresponding QLA requries 8 qubits/spa...
Protocols for Creating and Distilling Multipartite GHZ States With Bell Pairs
Sébastian de Bone, Runsheng Ouyang, K. Goodenough +1 more·Oct 23, 2020
The distribution of high-quality Greenberger–Horne–Zeilinger (GHZ) states is at the heart of many quantum communication tasks, ranging from extending the baseline of telescopes to secret sharing. They also play an important role in error-correction a...
Quantum Meets Fine-Grained Complexity: Sublinear Time Quantum Algorithms for String Problems
F. Gall, Saeed Seddighin·Oct 23, 2020
Longest common substring ( LCS ), longest palindrome substring ( LPS ), and Ulam distance ( UL ) are three fundamental string problems that can be classically solved in near linear time. In this work, we present sublinear time quantum algorithms for ...
Classical restrictions of generic matrix product states are quasi-locally Gibbsian
Yaiza Aragon'es-Soria, J. AAberg, Chae-Yeun Park +1 more·Oct 22, 2020
We show that the norm squared amplitudes with respect to a local orthonormal basis (the classical restriction) of finite quantum systems on one-dimensional lattices can be exponentially well approximated by Gibbs states of local Hamiltonians (i.e., a...