Papers
Live trends in quantum computing research, updated daily from arXiv.
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Qubit Platforms
Hardware platform mentions in abstracts — Photonic leads
Restricted Boltzmann Machines for galaxy morphology classification with a quantum annealer
J. Caldeira, Joshua Job, S. Adachi +2 more·Nov 14, 2019
We present the application of Restricted Boltzmann Machines (RBMs) to the task of astronomical image classification using a quantum annealer built by D-Wave Systems. Morphological analysis of galaxies provides critical information for studying their ...
NISQ computing for decision making under uncertainty
H. Naus·Nov 14, 2019
Noisy Intermediate-Scale Quantum computers are expected to be available this year. It is proposed to exploit such a device for decision making under uncertainty. The probabilistic character of quantum mechanics reflects this uncertainty. Concomitantl...
Adaptive filtering of projective quantum measurements using discrete stochastic methods
R. Gupta, M. Biercuk·Nov 13, 2019
Adaptive filtering is a powerful class of control theoretic concepts useful in extracting information from noisy data sets or performing forward prediction in time for a dynamic system. The broad utilization of the associated algorithms makes them at...
Finding good quantum codes using the Cartan form
Akshaya Jayashankar, Anjala M. Babu, H. Ng +1 more·Nov 7, 2019
We present a simple and fast numerical procedure to search for good quantum codes for storing logical qubits in the presence of independent per-qubit noise. In a key departure from past work, we use the worst-case fidelity as the figure of merit for ...
Design and experimental performance of local entanglement witness operators
D. Amaro, Markus P. Müller·Nov 4, 2019
Entanglement is a central concept in quantum information and a key resource for many quantum protocols. In this work we propose and analyze a class of entanglement witnesses that detect the presence of entanglement in subsystems of experimental multi...
Quantum state discrimination using noisy quantum neural networks
A. Patterson, Hongxiang Chen, Leonard Wossnig +3 more·Nov 1, 2019
Near-term quantum computers are noisy, and therefore must run algorithms with a low circuit depth and qubit count. Here we investigate how noise affects a quantum neural network (QNN) for state discrimination, applicable on near-term quantum devices ...
Optimization of CNOT circuits on limited-connectivity architecture
Bujiao Wu, Xiaoyu He, Shuai Yang +4 more·Oct 31, 2019
A CNOT circuit is the key gadget for entangling qubits in quantum computing systems. However, the qubit connectivity of noisy intermediate-scale quantum (NISQ) devices is constrained by their limited connectivity architecture. To improve the performa...
Quantum approximate Bayesian computation for NMR model inference
Dries Sels, Hesam Dashti, S. Mora +2 more·Oct 31, 2019
Recent technological advances may lead to the development of small-scale quantum computers that are capable of solving problems that cannot be tackled with classical computers. A limited number of algorithms have been proposed and their relevance to ...
Distributed quantum sensing enhanced by continuous-variable error correction
Quntao Zhuang, J. Preskill, Liang Jiang·Oct 30, 2019
A distributed sensing protocol uses a network of local sensing nodes to estimate a global feature of the network, such as a weighted average of locally detectable parameters. In the noiseless case, continuous-variable (CV) multipartite entanglement s...
Quantum equation of motion for computing molecular excitation energies on a noisy quantum processor
Pauline J. Ollitrault, A. Kandala, Chun-Fu Chen +7 more·Oct 28, 2019
The computation of molecular excitation energies is essential for predicting photo-induced reactions of chemical and technological interest. While the classical computing resources needed for this task scale poorly, quantum algorithms emerge as promi...
Experimental Implementation of Universal Nonadiabatic Geometric Quantum Gates in a Superconducting Circuit.
Yuan Xu, Ziyue Hua, Tao Chen +9 more·Oct 27, 2019
Using geometric phases to realize noise-resilient quantum computing is an important method to enhance the control fidelity. In this work, we experimentally realize a universal nonadiabatic geometric quantum gate set in a superconducting qubit chain. ...
Indexed improvements for real-time trotter evolution of a (1 + 1) field theory using NISQ quantum computers
Erik J. Gustafson, P. Dreher, Zheyue Hang +1 more·Oct 21, 2019
Today’s quantum computers offer the possibility of performing real-time calculations for quantum field theory scattering processes motivated by high energy physics. In order to follow the successful roadmap which has been established for the calculat...
A Domain-agnostic, Noise-resistant, Hardware-efficient Evolutionary Variational Quantum Eigensolver
Arthur G. Rattew, Shaohan Hu, Marco Pistoia +2 more·Oct 21, 2019
Variational quantum algorithms have shown promise in numerous fields due to their versatility in solving problems of scientific and commercial interest. However, leading algorithms for Hamiltonian simulation, such as the Variational Quantum Eigensolv...
Small quantum networks in the qudit stabilizer formalism
Daniel Miller·Oct 21, 2019
How much noise can a given quantum state tolerate without losing its entanglement? For qudits of arbitrary dimension, I investigate this question for two noise models: Global white noise, where a depolarizing channel is applied to all qudits simultan...
Optimal approximate quantum error correction for quantum metrology
Sisi Zhou, Liang Jiang·Oct 18, 2019
For a generic set of Markovian noise models, the estimation precision of a parameter associated with the Hamiltonian is limited by the $1/\sqrt{t}$ scaling where $t$ is the total probing time, in which case the maximal possible quantum improvement in...
Projected cooling algorithm for quantum computation
Dean Lee, J. Bonitati, Gabriel Given +6 more·Oct 17, 2019
Abstract In the current era of noisy quantum devices, there is a need for quantum algorithms that are efficient and robust against noise. Towards this end, we introduce the projected cooling algorithm for quantum computation. The projected cooling al...
Noise-Resilient Quantum Dynamics Using Symmetry-Preserving Ansatzes
M. Otten, C. Cortes, S. Gray·Oct 14, 2019
We describe and demonstrate a method for the computation of quantum dynamics on small, noisy universal quantum computers. This method relies on the idea of `restarting' the dynamics; at least one approximate time step is taken on the quantum computer...
Dynamical mean field theory algorithm and experiment on quantum computers
I. Rungger, Nathan Fitzpatrick, Honxiang Chen +12 more·Oct 10, 2019
The developments of quantum computing algorithms and experiments for atomic scale simulations have largely focused on quantum chemistry for molecules, while their application in condensed matter systems is scarcely explored. Here we present a quantum...
Quantum Error Correction
T. Brun·Oct 8, 2019
Quantum error correction is a set of methods to protect quantum information—that is, quantum states—from unwanted environmental interactions (decoherence) and other forms of noise. The information is stored in a quantum error-correcting code, which i...
Photonic quantum error correction of linear optics using W-state encoding
Madhav Krishnan Vijayan, A. Lund, P. Rohde·Oct 7, 2019
Error-detection and correction are necessary prerequisites for any scalable quantum computing architecture. Given the inevitability of unwanted physical noise in quantum systems and the propensity for errors to spread as computations proceed, computa...