Papers
Live trends in quantum computing research, updated daily from arXiv.
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Hardware platform mentions in abstracts — Photonic leads
Efficient State Preparation for Quantum Amplitude Estimation
Almudena Carrera Vazquez, Stefan Woerner·May 15, 2020
Quantum Amplitude Estimation (QAE) can achieve a quadratic speed-up for applications classically solved by Monte Carlo simulation. A key requirement to realize this advantage is efficient state preparation. If state preparation is too expensive, it c...
Classical Simulation of Quantum Supremacy Circuits
Cupjin Huang, Fang Zhang, M. Newman +10 more·May 14, 2020
It is believed that random quantum circuits are difficult to simulate classically. These have been used to demonstrate quantum supremacy: the execution of a computational task on a quantum computer that is infeasible for any classical computer. The t...
Simulating the fabrication of aluminium oxide tunnel junctions
M. Cyster, J. S. Smith, N. Vogt +3 more·May 14, 2020
Aluminium oxide (AlO x ) tunnel junctions are important components in a range of nanoelectric devices including superconducting qubits where they can be used as Josephson junctions. While many improvements in the reproducibility and reliability of qu...
Realistic simulation of quantum computation using unitary and measurement channels
Ahmed Abid Moueddene, N. Khammassi, K. Bertels +1 more·May 13, 2020
The implementation and practicality of quantum algorithms hinge largely on the quality of operations within a quantum processor. Therefore, including realistic error models in quantum computing simulation platforms is crucial for testing these algori...
Semiconductor qubits in practice
A. Chatterjee, Paul Stevenson, S. de Franceschi +3 more·May 13, 2020
In the past decade, semiconducting qubits have made great strides in overcoming decoherence, improving the prospects for scalability and have become one of the leading contenders for the development of large-scale quantum circuits. In this Review, we...
Intrinsic sign problem in fermionic and bosonic chiral topological matter
O. Golan, Adam Smith, Z. Ringel·May 12, 2020
The infamous sign problem leads to an exponential complexity in Monte Carlo simulations of generic many-body quantum systems. Nevertheless, many phases of matter are known to admit a sign-problem-free representative, allowing efficient simulations on...
Fast simulation of Grover's quantum search on classical computer
Ayan Chattopadhyay, V. Menon·May 10, 2020
The research community has been actively working on the realization of quantum computer. But the large scale commercial quantum computers are not a reality yet quantum computing field has become richer by day with the advent of algorithms and the ave...
Holographic quantum algorithms for simulating correlated spin systems
M. Foss-Feig, D. Hayes, J. Dreiling +5 more·May 6, 2020
We present a suite of "holographic" quantum algorithms for efficient ground-state preparation and dynamical evolution of correlated spin-systems, which require far-fewer qubits than the number of spins being simulated. The algorithms exploit the equi...
Generalization of CNOT-based Discrete Circular Quantum Walk: Simulation and Effect of Gate Errors
Iyed Ben Slimen, A. Gueddana, V. Lakshminarayanan·May 5, 2020
We investigate the counterparts of random walk in universal quantum computing and their implementation using standard quantum circuits. Quantum walk have been recently well investigated for traversing graphs with certain oracles. We focus our study o...
Spoofing Linear Cross-Entropy Benchmarking in Shallow Quantum Circuits
B. Barak, Chi-Ning Chou, Xun Gao·May 5, 2020
The linear cross-entropy benchmark (Linear XEB) has been used as a test for procedures simulating quantum circuits. Given a quantum circuit $C$ with $n$ inputs and outputs and purported simulator whose output is distributed according to a distributio...
Creating and Manipulating a Laughlin-Type ν=1/3 Fractional Quantum Hall State on a Quantum Computer with Linear Depth Circuits
Armin Rahmani, Kevin J Sung, Harald Putterman +3 more·May 5, 2020
Here we present an efficient quantum algorithm to generate an equivalent many-body state to Laughlin's $\nu=1/3$ fractional quantum Hall state on a digitized quantum computer. Our algorithm only uses quantum gates acting on neighboring qubits in a qu...
Quantum Poisson solver without arithmetic
Shengbin Wang, Zhimin Wang, Wendong Li +4 more·May 1, 2020
Solving differential equations is one of the most promising applications of quantum computing. The Poisson equation has applications in various domains of physics and engineering, including the simulation of ocean current dynamics. Here, we propose a...
Scalable quantum computation with fast gates in two-dimensional microtrap arrays of trapped ions
Z. Mehdi, Alexander K. Ratcliffe, J. Hope·May 1, 2020
We theoretically investigate the use of fast pulsed two-qubit gates for trapped ion quantum computing in a two-dimensional microtrap architecture. In one dimension, such fast gates are optimal when employed between nearest neighbors, and we examine t...
Entanglement spread area law in gapped ground states
Anurag Anshu, A. Harrow, Mehdi Soleimanifar·Apr 30, 2020
Ground-state entanglement governs various properties of quantum many-body systems at low temperatures and is the key to understanding gapped quantum phases of matter. Here we identify a structural property of entanglement in the ground state of gappe...
Coreset Clustering on Small Quantum Computers
T. Tomesh, P. Gokhale, Eric R. Anschütz +1 more·Apr 30, 2020
Many quantum algorithms for machine learning require access to classical data in superposition. However, for many natural data sets and algorithms, the overhead required to load the data set in superposition can erase any potential quantum speedup ov...
Quantum circuit representation of Bayesian networks
S. E. Borujeni, Saideep Nannapaneni, N. Nguyen +2 more·Apr 29, 2020
Probabilistic graphical models such as Bayesian networks are widely used to model stochastic systems to perform various types of analysis such as probabilistic prediction, risk analysis, and system health monitoring, which can become computationally ...
Quantum simulation of quantum field theories as quantum chemistry
Junyu Liu, Yuan Xin·Apr 27, 2020
Conformal truncation is a powerful numerical method for solving generic strongly-coupled quantum field theories based on purely field-theoretic technics without introducing lattice regularization. We discuss possible speedups for performing those com...
Quantum gradient algorithm for general polynomials
Pan Gao, Keren Li, Shijie Wei +2 more·Apr 23, 2020
Gradient-based algorithms, popular strategies to optimization problems, are essential for many modern machine-learning techniques. Theoretically, extreme points of certain cost functions can be found iteratively along the directions of the gradient. ...
Combining hard and soft decoders for hypergraph product codes
Antoine Grospellier, Lucien Grouès, Anirudh Krishna +1 more·Apr 23, 2020
Hypergraph product codes are a class of constant-rate quantum low-density parity-check (LDPC) codes equipped with a linear-time decoder called small-set-flip (SSF). This decoder displays sub-optimal performance in practice and requires very large err...
Quantum Solver of Contracted Eigenvalue Equations for Scalable Molecular Simulations on Quantum Computing Devices.
Scott E. Smart, D. Mazziotti·Apr 23, 2020
The accurate computation of ground and excited states of many-fermion quantum systems is one of the most consequential, contemporary challenges in the physical and computational sciences whose solution stands to benefit significantly from the advent ...