Papers
Live trends in quantum computing research, updated daily from arXiv.
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Qubit Platforms
Hardware platform mentions in abstracts — Photonic leads
Engineered thermalization and cooling of quantum many-body systems
Mekena Metcalf, J. Moussa, W. D. de Jong +1 more·Sep 4, 2019
Author(s): Metcalf, Mekena; Moussa, Jonathan E; Jong, Wibe A de; Sarovar, Mohan | Abstract: We develop a scheme for engineering genuine thermal states in analog quantum simulation platforms by coupling local degrees of freedom to driven, dissipative ...
Optimal Quantum Control with Poor Statistics
F. Sauvage, F. Mintert·Sep 3, 2019
Learning how to control a quantum system based on experimental data can help us to exceed the limitations imposed by theoretical modelling. Due to the intrinsic probabilistic nature of quantum mechanics, it is fundamentally necessary to repeat measur...
Experimental demonstration of memory-enhanced quantum communication
M. Bhaskar, R. Riedinger, B. Machielse +8 more·Sep 3, 2019
The ability to communicate quantum information over long distances is of central importance in quantum science and engineering1. Although some applications of quantum communication such as secure quantum key distribution2,3 are already being successf...
Optimal working point in digitized quantum annealing
G. Mbeng, Luca Arceci, G. Santoro·Sep 2, 2019
We present a study of the digitized Quantum Annealing protocol proposed by R. Barends et al., Nature 534, 222 (2016). Our analysis, performed on the benchmark case of a transverse Ising chain problem, shows that the algorithm has a well defined optim...
A New Method for Geometric Interpretation of Elliptic Curve Discrete Logarithm Problem
Daniele Di Tullio, Ankan Pal·Sep 1, 2019
In this paper, we intend to study the geometric meaning of the discrete logarithm problem defined over an Elliptic Curve. The key idea is to reduce the Elliptic Curve Discrete Logarithm Problem (EC-DLP) into a system of equations. These equations ari...
Area law of noncritical ground states in 1D long-range interacting systems
Tomotaka Kuwahara, Keiji Saito·Aug 30, 2019
The area law for entanglement provides one of the most important connections between information theory and quantum many-body physics. It is not only related to the universality of quantum phases, but also to efficient numerical simulations in the gr...
Discontinuous Galerkin discretization for quantum simulation of chemistry
J. McClean, F. Faulstich, Qinyi Zhu +5 more·Aug 30, 2019
All-electron electronic structure methods based on the linear combination of atomic orbitals method with Gaussian basis set discretization offer a well established, compact representation that forms much of the foundation of modern correlated quantum...
Classifying single-qubit noise using machine learning
Travis L. Scholten, Yi-Kai Liu, Kevin C. Young +1 more·Aug 30, 2019
Quantum characterization, validation, and verification (QCVV) techniques are used to probe, characterize, diagnose, and detect errors in quantum information processors (QIPs). An important component of any QCVV protocol is a mapping from experimental...
Methods for Measuring Magnetic Flux Crosstalk between Tunable Transmons
D. Abrams, N. Didier, S. Caldwell +2 more·Aug 30, 2019
In the gate model of quantum computing, a program is typically decomposed into a sequence of 1- and 2-qubit gates that are realized as control pulses acting on the system. A key requirement for a scalable control system is that the qubits are address...
Quantum Distributed Algorithm for Triangle Finding in the CONGEST Model
Taisuke Izumi, F. Gall, F. Magniez·Aug 30, 2019
This paper considers the triangle finding problem in the CONGEST model of distributed computing. Recent works by Izumi and Le Gall (PODC'17), Chang, Pettie and Zhang (SODA'19) and Chang and Saranurak (PODC'19) have successively reduced the classical ...
$O(N^3)$ Measurement Cost for Variational Quantum Eigensolver on Molecular Hamiltonians
P. Gokhale, Olivia Angiuli, Yongshan Ding +5 more·Aug 30, 2019
Variational quantum eigensolver (VQE) is a promising algorithm for near-term quantum machines. It can be used to estimate the ground state energy of a molecule by performing separate measurements of <inline-formula><tex-math notation="LaTeX">$O(N^4)$...
2D Qubit Placement of Quantum Circuits Using LONGPATH
Mrityunjay Ghosh, Nivedita Dey, D. Mitra +1 more·Aug 29, 2019
In order to achieve speedup over conventional classical computing for finding solution of computationally hard problems, quantum computing was introduced. Quantum algorithms can be simulated in a pseudo quantum environment, but implementation involve...
Practical implementation of a quantum backtracking algorithm
S. Martiel, Maxime Remaud·Aug 29, 2019
In previous work, Montanaro presented a method to obtain quantum speedups for backtracking algorithms, a general meta-algorithm to solve constraint satisfaction problems (CSPs). In this work, we derive a space efficient implementation of this method....
Quantum-classical hybrid algorithm using an error-mitigating N -representability condition to compute the Mott metal-insulator transition
Scott E. Smart, D. Mazziotti·Aug 28, 2019
Quantum algorithms for molecular electronic structure have been developed with lower computational scaling than their classical counterparts, but emerging quantum hardware is far from being capable of the coherence,connectivity and gate errors requir...
Entropy Gain and Information Loss by Measurements.
Xingrong Wang·Aug 28, 2019
When the von Neumann entropy of a quantum system is increased by measurements, part of its information is lost. To faithfully reflect such a gain-loss relation, we propose the Information Retrievability (IR) and Information Loss (IL), which depend on...
Quantum Approximate Counting, Simplified
S. Aaronson, Patrick Rall·Aug 28, 2019
In 1998, Brassard, Hoyer, Mosca, and Tapp (BHMT) gave a quantum algorithm for approximate counting. Given a list of $N$ items, $K$ of them marked, their algorithm estimates $K$ to within relative error $\varepsilon$ by making only $O\left( \frac{1}{\...
Classical versus quantum models in machine learning: insights from a finance application
Javier Alcazar, Vicente Leyton-Ortega, A. Perdomo-Ortiz·Aug 28, 2019
Although several models have been proposed towards assisting machine learning (ML) tasks with quantum computers, a direct comparison of the expressive power and efficiency of classical versus quantum models for datasets originating from real-world ap...
Propagation of microwave photons along a synthetic dimension
Nathan R. A. Lee, M. Pechal, E. Alex Wollack +3 more·Aug 27, 2019
The evenly-spaced modes of an electromagnetic resonator are coupled to each other by appropriate time-modulation, leading to dynamics analogous to those of particles hopping between different sites of a lattice. This substitution of a real spatial di...
Parton physics on a quantum computer
Henry Lamm, S. Lawrence, Y. Yamauchi·Aug 27, 2019
Parton distribution functions and hadronic tensors may be computed on a universal quantum computer without many of the complexities that apply to Euclidean lattice calculations. We detail algorithms for computing parton distribution functions and the...
Quantum computing for accelerating cross-correlations intensive applications in signal processing
V. C. Vivoli, Yu-Hao Deng, Kohr Holger +1 more·Aug 26, 2019
Despite their importance as subfields of mathematics and engineering, signal and image processing have not received much attention in the field of quantum computation. Cross-correlations are instrumental to all the aforementioned fields. In this arti...