Papers
Live trends in quantum computing research, updated daily from arXiv.
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15,750 papers in 12 months (-37% vs prior quarter)
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Qubit Platforms
Hardware platform mentions in abstracts — Photonic leads
Classical Optimizers for Noisy Intermediate-Scale Quantum Devices
W. Lavrijsen, Ana Tudor, Juliane Müller +2 more·Apr 6, 2020
We present a collection of optimizers tuned for usage on Noisy Intermediate-Scale Quantum (NISQ) devices. Optimizers have a range of applications in quantum computing, including the Variational Quantum Eigensolver (VQE) and Quantum Approximate Optimi...
Direct estimation of minimum gate fidelity
Yiping Lu, J. Sim, J. Suzuki +2 more·Apr 6, 2020
With the current interest in building quantum computers, there is a strong need for accurate and efficient characterization of the noise in quantum gate implementations. A key measure of the performance of a quantum gate is the minimum gate fidelity,...
Parity-to-charge conversion in Majorana qubit readout
Morten I. K. Munk, J. Schulenborg, R. Egger +1 more·Apr 5, 2020
We study the time-dependent effect of Markovian readout processes on Majorana qubits whose parity degrees of freedom are converted into the charge of a tunnel-coupled quantum dot. By applying a recently established effective Lindbladian approximation...
Spin wave based tunable switch between superconducting flux qubits
S. Yuan, Chuanpu Liu, Jilei Chen +9 more·Apr 5, 2020
Quantum computing hardware has received world-wide attention and made considerable progress recently. YIG thin film have spin wave (magnon) modes with low dissipation and reliable control for quantum information processing. However, the coherent coup...
Quantum Medical Imaging Algorithms
B. Kiani, Agnes Villanyi, S. Lloyd·Apr 4, 2020
A central task in medical imaging is the reconstruction of an image or function from data collected by medical devices (e.g., CT, MRI, and PET scanners). We provide quantum algorithms for image reconstruction with exponential speedup over classical c...
Measure of Tripartite Quantum Correlation in Multiqubit Symmetric Pure State
R. N. Deb·Apr 4, 2020
We propose a direct measure of tripartite quantum correlation in an arbitrary symmetric pure state of N correlated two-level atoms (qubits). We compute the third-order moments of the collective pseudo-spin operators in terms of the individual atomic ...
T-count and Qubit Optimized Quantum Circuit Designs of Carry Lookahead Adder
H. Thapliyal, Edgard Muñoz-Coreas, Vladislav Khalus·Apr 4, 2020
Quantum circuits of arithmetic operations such as addition are needed to implement quantum algorithms in hardware. Quantum circuits based on Clifford+T gates are used as they can be made tolerant to noise. The tradeoff of gaining fault tolerance from...
Theoretical Studies on Quantum Walks with a Time-varying Coin
Haruna Katayama, N. Hatakenaka, T. Fujii·Apr 3, 2020
Quantum walks can reconstruct quantum algorithms for quantum computation, where the precise controls of quantum state transfers between arbitrary distant sites are required. Here, we investigate quantum walks using a periodically time-varying coin bo...
Variational quantum state eigensolver
M. Cerezo, Kunal Sharma, A. Arrasmith +1 more·Apr 3, 2020
Extracting eigenvalues and eigenvectors of exponentially large matrices will be an important application of near-term quantum computers. The variational quantum eigensolver (VQE) treats the case when the matrix is a Hamiltonian. Here, we address the ...
Quantum-Assisted Graph Clustering and Quadratic Unconstrained D-ary Optimisation
Sayantani Pramanik, M. Chandra·Apr 3, 2020
Of late, we are witnessing spectacular developments in Quantum Information Processing with the availability of Noisy Intermediate-Scale Quantum devices of different architectures and various software development kits to work on quantum algorithms. Di...
Detecting Temporal Correlation via Quantum Random Number Generation
Yutaka Shikano, Kentaro Tamura, Raymond H. Putra·Apr 3, 2020
All computing devices, including quantum computers, must exhibit that for a given input, an output is produced in accordance with the program. The outputs generated by quantum computers that fulfill these requirements are not temporally correlated, h...
How to Compute Using Quantum Walks
V. Kendon·Apr 3, 2020
Quantum walks are widely and successfully used to model diverse physical processes. This leads to computation of the models, to explore their properties. Quantum walks have also been shown to be universal for quantum computing. This is a more subtle ...
Investigating the potential for a limited quantum speedup on protein lattice problems
C. Outeiral, G. Morris, Jiye Shi +3 more·Apr 2, 2020
Protein folding is a central challenge in computational biology, with important applications in molecular biology, drug discovery and catalyst design. As a hard combinatorial optimisation problem, it has been studied as a potential target problem for...
Single-electron control in a foundry-fabricated two-dimensional qubit array
Fabio Ansaloni, A. Chatterjee, H. Bohuslavskyi +4 more·Apr 2, 2020
Silicon spin qubits have achieved high-fidelity one- and two-qubit gates, above error correction thresholds, promising an industrial route to fault-tolerant quantum computation. A significant next step for the development of scalable multi-qubit proc...
Simulating the effect of weak measurements by a phase damping channel and extraction of bipartite correlations in nuclear magnetic resonance
Akanksha Gautam, Varad R. Pande, Amandeep Singh +2 more·Apr 2, 2020
Quantum discord is a measure based on local projective measurements which captures quantum correlations that go beyond entanglement. A change in the measurement process, achieved by replacing rank-one projectors with a weak positive operator-valued m...
Quasiparticle Poisoning of Majorana Qubits.
Torsten Karzig, W. Cole, D. Pikulin·Apr 2, 2020
Qubits based on Majorana zero modes are a promising path towards topological quantum computing. Such qubits, though, are susceptible to quasiparticle poisoning which does not have to be small by topological argument. We study the main sources of the ...
A Heuristic Quantum-Classical Algorithm for Modeling Substitutionally Disordered Binary Crystalline Materials
Tanvi P. Gujarati, Tyler Y Takeshita, A. Hintennach +1 more·Apr 2, 2020
Improving the efficiency and accuracy of energy calculations has been of significant and continued interest in the area of materials informatics, a field that applies machine learning techniques to computational materials data. Here, we present a heu...
Guide to Exact Diagonalization Study of Quantum Thermalization
Jung-H. Jung, J. Noh·Apr 1, 2020
Exact diagonalization is a powerful numerical method to study isolated quantum many-body systems. This paper provides a review of numerical algorithms to diagonalize the Hamiltonian matrix. Symmetry and the conservation law help us perform the numeri...
Quantum algorithms for computational geometry problems
A. Ambainis, N. Larka·Apr 1, 2020
We study quantum algorithms for problems in computational geometry, such as POINT-ON-3-LINES problem. In this problem, we are given a set of lines and we are asked to find a point that lies on at least $3$ of these lines. POINT-ON-3-LINES and many ot...
Grover on SIMON\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$\,SIMON\,$$\end{document}
Ravi Anand, Arpita Maitra, S. Mukhopadhyay·Apr 1, 2020
For any symmetric key cryptosystem with n-bit secret key, the key can be recovered in O(2n/2)\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} ...