Papers
Live trends in quantum computing research, updated daily from arXiv.
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Hardware platform mentions in abstracts — Photonic leads
Real-time simulation of light-driven spin chains on quantum computers
M. Rodriguez-Vega, Elizabeth Carlander, A. Bahri +3 more·Aug 12, 2021
In this work, we study the real-time evolution of periodically driven (Floquet) systems on a quantum computer using IBM quantum devices. We consider a driven Landau–Zener model and compute the transition probability between the Floquet steady states ...
Neural Networks as Universal Probes of Many-Body Localization in Quantum Graphs
Cameron Beetar, Jeff Murugan, Dario Rosa·Aug 12, 2021
We show that a neural network, trained on the entanglement spectra of a nearest neighbor Heisenberg chain in a random transverse magnetic field, can be used to efficiently study the ergodic/many-body localized properties of a number of other quantum ...
Multi-Tensor Contraction for XEB Verification of Quantum Circuits
G. Kalachev, Pavel Panteleev, M. Yung·Aug 12, 2021
The computational advantage of noisy quantum computers has been demonstrated by sampling the bitstrings of quantum random circuits. An important issue is how the performance of quantum devices could be quantified in the so-called"supremacy regime". T...
Parameters Fixing Strategy for Quantum Approximate Optimization Algorithm
Xinwei Lee, Yoshiyuki Saito, DongSheng Cai +1 more·Aug 11, 2021
The quantum approximate optimization algorithm (QAOA) has numerous promising applications in solving the combinatorial optimization problems on near-term Noisy Intermediate Scalable Quantum (NISQ) devices. QAOA has a quantum-classical hybrid structur...
Learning quantum Hamiltonians from high-temperature Gibbs states and real-time evolutions
Jeongwan Haah, Robin Kothari, Ewin Tang·Aug 10, 2021
The behaviour of a system is determined by its Hamiltonian. In many cases, the exact Hamiltonian is not known and has to be extracted by analysing the outcome of measurements. We study the problem of learning a local Hamiltonian H to a given precisio...
Linear Programming Bounds for Approximate Quantum Error Correction Over Arbitrary Quantum Channels
Yingkai Ouyang, C. Lai·Aug 10, 2021
While quantum weight enumerators establish some of the best upper bounds on the minimum distance of quantum error-correcting codes, these bounds are not optimized to quantify the performance of quantum codes under the effect of arbitrary quantum chan...
QForte: an efficient state simulator and quantum algorithms library for molecular electronic structure
Nicholas H Stair, Francesco A. Evangelista·Aug 10, 2021
We introduce a novel open-source software package QForte, a comprehensive development tool for new quantum simulation algorithms. QForte incorporates functionality for handling molecular Hamiltonians, fermionic encoding, ansatz construction, time evo...
Spiderweb Nanomechanical Resonators via Bayesian Optimization: Inspired by Nature and Guided by Machine Learning
Dongil Shin, Andrea Cupertino, M. H. J. D. Jong +3 more·Aug 10, 2021
From ultrasensitive detectors of fundamental forces to quantum networks and sensors, mechanical resonators are enabling next‐generation technologies to operate in room‐temperature environments. Currently, silicon nitride nanoresonators stand as a lea...
Designing gate operations for single ion quantum computing in rare-earth-ion-doped crystals
A. Kinos, L. Rippe, S. Kroll +1 more·Aug 10, 2021
Quantum computers based on rare-earth-ion-doped crystals show promising properties in terms of scalability and connectivity if single ions can be used as qubits. Through simulations, we investigate gate operations on such qubits and discuss how gate ...
Quantum reinforcement learning: the maze problem
Nicola Dalla Pozza, L. Buffoni, Stefano Martina +1 more·Aug 10, 2021
Quantum machine learning (QML) is a young but rapidly growing field where quantum information meets machine learning. Here, we will introduce a new QML model generalising the classical concept of reinforcement learning to the quantum domain, i.e. qua...
Quantum algorithms for quantum dynamics: A performance study on the spin-boson model
Alexander Miessen, Pauline J. Ollitrault, I. Tavernelli·Aug 9, 2021
Quantum algorithms for quantum dynamics simulations are traditionally based on implementing a Trotter-approximation of the time-evolution operator. This approach typically relies on deep circuits and is therefore hampered by the substantial limitatio...
Decodable hybrid dynamics of open quantum systems with <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msub><mml:mi mathvariant="double-struck">Z</mml:mi><mml:mn>2</mml:mn></mml:msub></mml:math> symmetry
Yaodong Li, Matthew Fisher·Aug 9, 2021
We explore a class of"open"quantum circuit models with local decoherence ("noise") and local projective measurements, each respecting a global Z_2 symmetry. The model supports a spin glass phase where the Z_2 symmetry is spontaneously broken (not pos...
Deterministic one-way logic gates on a cloud quantum computer
Zhi-Peng Yang, Huan-Yu Ku, A. Baishya +6 more·Aug 9, 2021
One-way quantum computing is a promising candidate for fault-tolerant quantum computing. Here, we propose new protocols to realize a deterministic one-way CNOT gate and one-way $X$-rotations on quantum-computing platforms. By applying a delayed-choic...
Topological Properties and Characterizations
J. Zhang·Aug 8, 2021
There are three important types of structural properties that remain unchanged under the structural transformation of condensed matter physics and chemistry. They are the properties that remain unchanged under the structural periodic transformation-p...
Universal quantum state preparation via revised greedy algorithm
Runhong He, Hai-Da Liu, Shengbin Wang +3 more·Aug 7, 2021
Preparation of quantum state lies at the heart of quantum information processing. The greedy algorithm provides a potential method to effectively prepare quantum state. However, the standard greedy (SG) algorithm, in general, cannot take the global m...
Quantum Gate for a Kerr Nonlinear Parametric Oscillator Using Effective Excited States
T. Kanao, S. Masuda, S. Kawabata +1 more·Aug 6, 2021
A Kerr-nonlinear parametric oscillator (KPO) can stabilize a quantum superposition of two coherent states with opposite phases, which can be used as a qubit. In a universal gate set for quantum computation with KPOs, an $R_x$ gate, which interchanges...
An Algebraic Quantum Circuit Compression Algorithm for Hamiltonian Simulation
Daan Camps, Efekan Kökcü, Lindsay Bassman +3 more·Aug 6, 2021
Quantum computing is a promising technology that harnesses the peculiarities of quantum mechanics to deliver computational speedups for some problems that are intractable to solve on a classical computer. Current generation noisy intermediate-scale q...
On the Exponential Sample Complexity of the Quantum State Sign Estimation Problem
Arthur G. Rattew, Marco Pistoia·Aug 6, 2021
We demonstrate that the ability to estimate the relative sign of an arbitrary $n$-qubit quantum state (with real amplitudes), given only $k$ copies of that state, would yield a $kn$-query algorithm for unstructured search. Thus the quantum sample com...
Algebraic Compression of Quantum Circuits for Hamiltonian Evolution
Efekan Kökcü, Daan Camps, Lindsay Bassman +4 more·Aug 6, 2021
Unitary evolution under a time dependent Hamiltonian is a key component of simulation on quantum hardware. Synthesizing the corresponding quantum circuit is typically done by breaking the evolution into small time steps, also known as Trotterization,...
Quantum Quantile Mechanics: Solving Stochastic Differential Equations for Generating Time‐Series
Annie E. Paine, V. Elfving, O. Kyriienko·Aug 6, 2021
A quantum algorithm is proposed for sampling from a solution of stochastic differential equations (SDEs). Using differentiable quantum circuits (DQCs) with a feature map encoding of latent variables, the quantile function is represented for an underl...