Papers
Live trends in quantum computing research, updated daily from arXiv.
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Qubit Platforms
Hardware platform mentions in abstracts — Photonic leads
Quantum Computation of Fluid Dynamics
Sachin S. Bharadwaj, K. Sreenivasan·Jul 17, 2020
Studies of strongly nonlinear dynamical systems such as turbulent flows call for superior computational prowess. With the advent of quantum computing, a plethora of quantum algorithms have demonstrated, both theoretically and experimentally, more pow...
Optimal universal quantum error correction via bounded reference frames
Yuxiang Yang, Y. Mo, J. Renes +2 more·Jul 17, 2020
Error correcting codes with a universal set of transversal gates are a desideratum for quantum computing. Such codes, however, are ruled out by the Eastin-Knill theorem. Moreover, the theorem also rules out codes which are covariant with respect to t...
Abelian topological order of ν=2/5 and 3/7 fractional quantum Hall states in lattice models
Bartholomew Andrews, M. Mohan, T. Neupert·Jul 17, 2020
Determining the statistics of elementary excitations supported by fractional quantum Hall states is crucial to understanding their properties and potential applications. In this paper, we use the topological entanglement entropy as an indicator of Ab...
High-fidelity two-qubit gates in silicon above one Kelvin.
L. Petit, M. Russ, H. Eenink +4 more·Jul 17, 2020
Spin qubits in quantum dots define an attractive platform for scalable quantum information because of their compatibility with semiconductor manufacturing, their long coherence times, and the ability to operate at temperatures exceeding one Kelvin. Q...
A non-algorithmic approach to “programming” quantum computers via machine learning
Nathan L. Thompson, J. Steck, E. Behrman·Jul 16, 2020
Major obstacles remain to the implementation of macroscopic quantum computing: hardware problems of noise, decoherence, and scaling; software problems of error correction; and, most important, algorithm construction. Finding truly quantum algorithms ...
Achieving fair sampling in quantum annealing
Vaibhaw Kumar, Casey Tomlin, C. Nehrkorn +2 more·Jul 16, 2020
Sampling all ground states of a Hamiltonian with equal probability is a desired feature of a sampling algorithm, but recent studies indicate that common variants of transverse field quantum annealing sample the ground state subspace unfairly. In this...
Quantum algorithms for graph problems with cut queries
Troy Lee, M. Santha, Shengyu Zhang·Jul 16, 2020
Let $G$ be an $n$-vertex graph with $m$ edges. When asked a subset $S$ of vertices, a cut query on $G$ returns the number of edges of $G$ that have exactly one endpoint in $S$. We show that there is a bounded-error quantum algorithm that determines a...
Experimental implementation of non-Clifford interleaved randomized benchmarking with a controlled- S gate
Shelly Garion, Naoki Kanazawa, H. Landa +4 more·Jul 16, 2020
Hardware efficient transpilation of quantum circuits to a quantum devices native gateset is essential for the execution of quantum algorithms on noisy quantum computers. Typical quantum devices utilize a gateset with a single two-qubit Clifford entan...
Electrical control of coherent spin rotation of a single-spin qubit
Xiaoche Wang, Yuxuan Xiao, Chuanpu Liu +7 more·Jul 15, 2020
Nitrogen vacancy (NV) centers, optically active atomic defects in diamond, have attracted tremendous interest for quantum sensing, network, and computing applications due to their excellent quantum coherence and remarkable versatility in a real, ambi...
Fast Estimation of Sparse Quantum Noise
R. Harper, Wenjun Yu, S. Flammia·Jul 15, 2020
As quantum computers approach the fault tolerance threshold, diagnosing and characterizing the noise on large scale quantum devices is increasingly important. One of the most important classes of noise channels is the class of Pauli channels, for rea...
Compilation of Fault-Tolerant Quantum Heuristics for Combinatorial Optimization
Y. Sanders, D. Berry, Pedro C. S. Costa +5 more·Jul 14, 2020
Here we explore which heuristic quantum algorithms for combinatorial optimization might be most practical to try out on a small fault-tolerant quantum computer. We compile circuits for several variants of quantum accelerated simulated annealing inclu...
Emergent entanglement structures and self-similarity in quantum spin chains
Boris Sokolov, M. Rossi, Guillermo García-Pérez +1 more·Jul 14, 2020
We introduce an experimentally accessible network representation for many-body quantum states based on entanglement between all pairs of its constituents. We illustrate the power of this representation by applying it to a paradigmatic spin chain mode...
Quantum exploration algorithms for multi-armed bandits
Daochen Wang, Xuchen You, Tongyang Li +1 more·Jul 14, 2020
Identifying the best arm of a multi-armed bandit is a central problem in bandit optimization. We study a quantum computational version of this problem with coherent oracle access to states encoding the reward probabilities of each arm as quantum ampl...
Emulating Quantum Circuits With Generalized Ising Machines
S. Chowdhury, Kerem Y Çamsarı, S. Datta·Jul 14, 2020
The primary objective of this paper is to present an exact and general procedure for mapping any sequence of quantum gates onto a network of probabilistic p-bits which can take on one of two values 0 and 1. The first <inline-formula> <tex-math notati...
Comparison of dielectric loss in titanium nitride and aluminum superconducting resonators
A. Melville, G. Calusine, W. Woods +8 more·Jul 14, 2020
Lossy dielectrics are a significant source of decoherence in superconducting quantum circuits. In this report, we model and compare the dielectric loss in bulk and interfacial dielectrics in titanium nitride (TiN) and aluminum (Al) superconducting co...
A Quantum Graph Neural Network Approach to Particle Track Reconstruction
Cenk Tuysuz, F. Carminati, B. Demirkoz +6 more·Jul 14, 2020
Unprecedented increase of complexity and scale of data is expected in computation necessary for the tracking detectors of the High Luminosity Large Hadron Collider (HL-LHC) experiments. While currently used Kalman filter based algorithms are reaching...
Dementia Prediction Applying Variational Quantum Classifier
Daniel Sierra-Sosa, Juan D. Arcila-Moreno, B. Garcia-Zapirain +2 more·Jul 14, 2020
Dementia is the fifth cause of death worldwide with 10 million new cases every year. Healthcare applications using machine learning techniques have almost reached the physical limits while more data is becoming available resulting from the increasing...
Hybrid divide-and-conquer approach for tree search algorithms
Mathys Rennela, Sebastiaan Brand, A. Laarman +1 more·Jul 14, 2020
One of the challenges of quantum computers in the near- and mid- term is the limited number of qubits we can use for computations. Finding methods that achieve useful quantum improvements under size limitations is thus a key question in the field. In...
Benchmarking 16-element quantum search algorithms on IBM quantum processors
Jan Gwinner, Marcin Bria'nski, W. Burkot +2 more·Jul 13, 2020
We present experimental results on running 4-qubit unstructured search on IBM quantum processors. Our best attempt attained probability of success around 24.5%. We try several algorithms and use the most recent developments in quantum search to reduc...
Quantum Key Distribution Over Quantum Repeaters with Encoding: Using Error Detection as an Effective Postselection Tool
Yumang Jing, D. Alsina, M. Razavi·Jul 13, 2020
We propose a post-selection technique, based on quantum error detection, for quantum key distribution (QKD) systems that run over quantum repeaters with encoding. In such repeaters, quantum error correction techniques are used for entanglement distil...