Papers
Live trends in quantum computing research, updated daily from arXiv.
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Qubit Platforms
Hardware platform mentions in abstracts — Photonic leads
Variational algorithms for linear algebra.
Xiaosi Xu, Jinzhao Sun, Suguru Endo +3 more·Sep 9, 2019
Quantum algorithms have been developed for efficiently solving linear algebra tasks. However, they generally require deep circuits and hence universal fault-tolerant quantum computers. In this work, we propose variational algorithms for linear algebr...
Measurement on quantum devices with applications to time-dependent density functional theory
Jun Yang, James Brown, J. Whitfield·Sep 6, 2019
Quantum algorithms are touted as a way around some classically intractable problems such as the simulation of quantum mechanics. At the end of all quantum algorithms is a quantum measurement whereby classical data is extracted and utilized. In fact, ...
Quantum classifier with tailored quantum kernel
Carsten Blank, D. Park, J. Rhee +1 more·Sep 5, 2019
Kernel methods have a wide spectrum of applications in machine learning. Recently, a link between quantum computing and kernel theory has been formally established, opening up opportunities for quantum techniques to enhance various existing machine-l...
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...
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...
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...
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....
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...
Simulation of a Dynamic, RuleSet-based Quantum Network
Takaaki Matsuo·Aug 26, 2019
Similar to the classical Internet, the quantum Internet will require knowledge regarding link qualities used for purposes such as optimal route selection. This is commonly accomplished by performing link-level tomography with or without purification ...
Variational quantum algorithm for nonequilibrium steady states
N. Yoshioka, Yuya O. Nakagawa, K. Mitarai +1 more·Aug 26, 2019
We propose a quantum-classical hybrid algorithm to simulate the non-equilibrium steady state of an open quantum many-body system, named the dissipative-system Variational Quantum Eigensolver (dVQE). To employ the variational optimization technique fo...
Detecting crosstalk errors in quantum information processors
M. Sarovar, T. Proctor, K. Rudinger +3 more·Aug 26, 2019
Crosstalk occurs in most quantum computing systems with more than one qubit. It can cause a variety of correlated and nonlocal crosstalk errors that can be especially harmful to fault-tolerant quantum error correction, which generally relies on error...
Optimal control for the quantum simulation of nuclear dynamics
E. Holland, K. Wendt, K. Kravvaris +6 more·Aug 22, 2019
We propose a method for enacting the unitary time propagation of two interacting neutrons at leading order of chiral effective-field theory by efficiently encoding the nuclear dynamics into a single multilevel quantum device. The emulated output of t...
A Full Quantum Eigensolver for Quantum Chemistry Simulations
Shijie Wei, Hang Li, Guilu Long·Aug 21, 2019
Quantum simulation of quantum chemistry is one of the most compelling applications of quantum computing. It is of particular importance in areas ranging from materials science, biochemistry, and condensed matter physics. Here, we propose a full quant...
Quantum-Kit: Simulating Shor's Factorization of 24-Bit Number on Desktop
A. Tankasala, H. Ilatikhameneh·Aug 20, 2019
Quantum-Kit is a graphical desktop application for quantum circuit simulations. Its powerful, memory-efficient computational engine enables large-scale simulations on a desktop. The ability to design hybrid circuits, with both quantum and classical b...
Quantum algorithms for Second-Order Cone Programming and Support Vector Machines
Iordanis Kerenidis, A. Prakash, Dániel Szilágyi·Aug 19, 2019
We present a quantum interior-point method (IPM) for second-order cone programming (SOCP) that runs in time O~(nrζκδ2log(1/ϵ)) where r is the rank and n the dimension of the SOCP, δ bounds the distance of intermediate solutions from the cone boundar...
Nearly Optimal Measurement Scheduling for Partial Tomography of Quantum States
Xavier Bonet-Monroig, R. Babbush, T. O’Brien·Aug 15, 2019
Many applications of quantum simulation require to prepare and then characterize quantum states by performing an efficient partial tomography to estimate observables corresponding to $k$-body reduced density matrices ($k$-RDMs). For instance, variati...
Continuous-Variable Quantum Key Distribution with Rateless Reconciliation Protocol
Chao Zhou, Xiangyu Wang, Yichen Zhang +3 more·Aug 13, 2019
Information reconciliation is crucial for continuous-variable quantum key distribution (CV-QKD) because its performance affects the secret key rate and maximal secure transmission distance. Fixed-rate error correction codes limit the potential applic...
Simulating Quantum Algorithms Using Fidelity and Coherence Time as Principle Models for Error
Daniel Koch, A. Torrance, D. Kinghorn +3 more·Aug 12, 2019
As various quantum computing technologies continue to compete for quantum supremacy, several parameters have emerged as benchmarks for the quality of qubits. These include fidelity, coherence times, connectivity, and a few others. In this paper, we a...