Papers
Live trends in quantum computing research, updated daily from arXiv.
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Hardware platform mentions in abstracts — Photonic leads
Credit Risk Analysis Using Quantum Computers
D. Egger, Ricardo García Gutiérrez, Jordi Cahu'e Mestre +1 more·Jul 5, 2019
We present and analyze a quantum algorithm to estimate credit risk more efficiently than Monte Carlo simulations can do on classical computers. More precisely, we estimate the economic capital requirement, i.e. the difference between the Value at Ris...
Numerical simulation of critical dissipative non-equilibrium quantum systems with an absorbing state
E. Gillman, F. Carollo, I. Lesanovsky·Jul 4, 2019
The simulation of out-of-equilibrium dissipative quantum many body systems is a problem of fundamental interest to a number of fields in physics, ranging from condensed matter to cosmology. For unitary systems, tensor network methods have proved succ...
Symmetry Configuration Mapping for Representing Quantum Systems on Quantum Computers.
Sean A. Fischer, D. Gunlycke·Jul 2, 2019
Quantum computing has the potential to significantly speed up complex computational tasks, and arguably the most promising application area for near-term quantum computers is the simulation of quantum mechanics. To make the most of our limited quantu...
Tunable, Hardware-Based Quantum Random Number Generation Using Coupled Quantum Dots
H. McCabe, Scott Koziol, G. Snider +1 more·Jul 1, 2019
Random numbers are a valuable commodity in gaming and gambling, simulation, conventional and quantum cryptography, and in non-conventional computing schemes such as stochastic computing. We propose to generate a random bit using a position measuremen...
Gluon field digitization for quantum computers
A. Alexandru, P. Bedaque, Siddhartha Harmalkar +3 more·Jun 27, 2019
Simulations of gauge theories on quantum computers require the digitization of continuous field variables. Digitization schemes that uses the minimum amount of qubits are desirable. We present a practical scheme for digitizing $SU(3)$ gauge theories ...
Matrix product state algorithms for Gaussian fermionic states
N. Schuch, B. Bauer·Jun 25, 2019
While general quantum many-body systems require exponential resources to be simulated on a classical computer, systems of non-interacting fermions can be simulated exactly using polynomially scaling resources. Such systems may be of interest in their...
Machine Learning Phase Transitions with a Quantum Processor
A. Uvarov, A. Kardashin, J. Biamonte·Jun 24, 2019
Machine learning has emerged as a promising approach to unveil properties of many-body systems. Recently proposed as a tool to classify phases of matter, the approach relies on classical simulation methods---such as Monte Carlo---which are known to e...
Quasiexact Kondo Dynamics of Fermionic Alkaline-Earth-Like Atoms at Finite Temperatures.
S. Goto, I. Danshita·Jun 21, 2019
A recent experiment has observed the antiferromagnetic interaction between the ground state ^{1}S_{0} and the metastable state ^{3}P_{0} of ^{171}Yb atoms, which are fermionic. This observation combined with the use of state-dependent optical lattice...
Hybrid Quantum/Classical Derivative Theory: Analytical Gradients and Excited-State Dynamics for the Multistate Contracted Variational Quantum Eigensolver
R. Parrish, E. Hohenstein, P. McMahon +1 more·Jun 20, 2019
The maturation of analytical derivative theory over the past few decades has enabled classical electronic structure theory to provide accurate and efficient predictions of a wide variety of observable properties. However, classical implementations of...
High-fidelity single-qubit gates in a strongly driven quantum-dot hybrid qubit with1/fcharge noise
Yuan-Chi Yang, S. Coppersmith, M. Friesen·Jun 19, 2019
Semiconductor double quantum dot hybrid qubits are promising candidates for high-fidelity quantum computing. However, their performance is limited by charge noise, which is ubiquitous in solid-state devices, and phonon-induced dephasing. Here we expl...
Digital-analog quantum algorithm for the quantum Fourier transform
Ana Martin, L. Lamata, E. Solano +1 more·Jun 18, 2019
Quantum computers will allow calculations beyond existing classical computers. However, current technology is still too noisy and imperfect to construct a universal digital quantum computer with quantum error correction. Inspired by the evolution of ...
Time-dependent Hamiltonian simulation with $L^1$-norm scaling
D. Berry, Andrew M. Childs, Yuan Su +2 more·Jun 17, 2019
The difficulty of simulating quantum dynamics depends on the norm of the Hamiltonian. When the Hamiltonian varies with time, the simulation complexity should only depend on this quantity instantaneously. We develop quantum simulation algorithms that ...
Approaching graph problems with continuous variable quantum computing.
Michal Stkechly, N. Bashige, Przemyslaw Chojecki·Jun 17, 2019
We introduce a method for solving the Max-Cut problem using a variational algorithm and a continuous-variables quantum computing approach. The quantum circuit consists of two parts: the first one embeds a graph into a circuit using the Takagi decompo...
Mitigating coherent noise using Pauli conjugation
Z. Cai, Xiaosi Xu, S. Benjamin·Jun 14, 2019
Coherent noise can be much more damaging than incoherent (probabilistic) noise in the context of quantum error correction. One solution is to use twirling to turn coherent noise into incoherent Pauli channels. In this Article, we show that some of th...
Observation of information flow in the anti-𝒫𝒯-symmetric system with nuclear spins
Jingwei Wen, Guo-qing Qin, Chao Zheng +4 more·Jun 12, 2019
The recently theoretical and experimental researches on PT\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\od...
Spatial noise correlations in a Si/SiGe two-qubit device from Bell state coherences
J. Boter, X. Xue, T. Krähenmann +10 more·Jun 6, 2019
We study spatial noise correlations in a Si/SiGe two-qubit device with integrated micromagnets. Our method relies on the concept of decoherence-free subspaces, whereby we measure the coherence time for two different Bell states, designed to be sensit...
Quantum algorithm for total least squares data fitting
Hefeng Wang, Hua Xiang·Jun 4, 2019
Abstract The total least squares (TLS) method is widely used in data-fitting. Compared with the least squares fitting method, the TLS fitting takes into account not only observation errors, but also errors from the measurement matrix of the variables...
Hamiltonian engineering of general two-body spin-1/2 interactions
K. Attar, D. Farfurnik, N. Bar-Gill·Jun 2, 2019
Spin Hamiltonian engineering in solid-state systems plays a key role in a variety of applications ranging from quantum information processing and quantum simulations to novel studies of many-body physics. By analyzing the irreducible form of a genera...
Thermo Field Dynamics on a Quantum Computer
R. Miceli, M. McGuigan·Jun 1, 2019
In this project we develop a quantum algorithm to realize finite temperature simulation on a quantum computer. As quantum computers use real-time evolution we did not use the imaginary time methods popular on classical algorithms. Instead, we impleme...
Experimental Demonstration of Force Driven Quantum Harmonic Oscillator in IBM Quantum Computer.
A. Baishya, L. Kumar, B. K. Behera +1 more·Jun 1, 2019
Though algorithms for quantum simulation of Quantum Harmonic Oscillator (QHO) have been proposed, still they have not yet been experimentally verified. Here, for the first time, we demonstrate a quantum simulation of QHO in the presence of both time-...