Papers
Live trends in quantum computing research, updated daily from arXiv.
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Qubit Platforms
Hardware platform mentions in abstracts — Photonic leads
Accurately computing the electronic properties of a quantum ring
C. Neill, T. McCourt, X. Mi +89 more·Dec 2, 2020
A promising approach to study condensed-matter systems is to simulate them on an engineered quantum platform1–4. However, the accuracy needed to outperform classical methods has not been achieved so far. Here, using 18 superconducting qubits, we prov...
Floquet engineering of continuous-time quantum walks: Toward the simulation of complex and next-nearest-neighbor couplings
Leonardo Novo, S. Ribeiro·Dec 1, 2020
The formalism of continuous-time quantum walks on graphs has been widely used in the study of quantum transport of energy and information, as well as in the development of quantum algorithms. In experimental settings, however, there is limited contro...
A Hybrid System for Learning Classical Data in Quantum States
S. Stein, Ryan L'Abbate, W. Mu +6 more·Dec 1, 2020
Deep neural network powered artificial intelligence has rapidly changed our daily life with various applications. However, as one of the essential steps of deep neural networks, training a heavily-weighted network requires a tremendous amount of comp...
Single-particle digitization strategy for quantum computation of a ϕ4 scalar field theory
J. Barata, N. Mueller, A. Tarasov +1 more·Nov 30, 2020
Motivated by the parton picture of high energy quantum chromodynamics, we develop a single-particle digitization strategy for the efficient quantum simulation of relativistic scattering processes in a $d+1$ dimensional scalar $\phi^4$ field theory. W...
Determining the proton content with a quantum computer
Adrián Pérez-Salinas, J. Cruz-Martinez, A. Alhajri +1 more·Nov 27, 2020
We present a first attempt to design a quantum circuit for the determination of the parton content of the proton through the estimation of parton distribution functions (PDFs), in the context of high energy physics (HEP). The growing interest in quan...
Qulacs: a fast and versatile quantum circuit simulator for research purpose
Yasunari Suzuki, Yoshiaki Kawase, Yuya Masumura +17 more·Nov 27, 2020
To explore the possibilities of a near-term intermediate-scale quantum algorithm and long-term fault-tolerant quantum computing, a fast and versatile quantum circuit simulator is needed. Here, we introduce Qulacs, a fast simulator for quantum circuit...
A game of quantum advantage: linking verification and simulation
Daniel Stilck França, R. García-Patrón·Nov 24, 2020
We present a formalism that captures the process of proving quantum superiority to skeptics as an interactive game between two agents, supervised by a referee. Bob, is sampling from a classical distribution on a quantum device that is supposed to dem...
Non-equilibrium dynamics of a dissipative two-site Hubbard model simulated on IBM quantum computers
S. Tornow, W. Gehrke, U. Helmbrecht·Nov 22, 2020
Many-body physics is one very well suited field for testing quantum algorithms and for finding working heuristics on present quantum computers. We have investigated the non-equilibrium dynamics of one- and two-electron systems, which are coupled to a...
Efficient preparation of 2D defect-free atom arrays with near-fewest sorting-atom moves
Cheng Sheng, Jiayi Hou, Xiaodong He +7 more·Nov 20, 2020
Sorting atoms stochastically loaded in optical tweezer array via an auxiliary mobile tweezer is an efficient approach to prepare defect-free atom arrays of arbitrary geometries. However, high filling fraction of atom-by-atom assemblers is impeded by ...
Quantum Multiple Kernel Learning
Seyed Shakib Vedaie, M. Noori, J. S. Oberoi +2 more·Nov 19, 2020
Kernel methods play an important role in machine learning applications due to their conceptual simplicity and superior performance on numerous machine learning tasks. Expressivity of a machine learning model, referring to the ability of the model to ...
Proposal for Entangling Gates on Fluxonium Qubits via a Two-Photon Transition
K. Nesterov, Q. Ficheux, V. Manucharyan +1 more·Nov 19, 2020
We propose a family of microwave-activated entangling gates on two capacitively coupled fluxonium qubits. A microwave pulse applied to either qubit at a frequency near the half-frequency of the $|00\rangle - |11\rangle$ transition induces two-photon ...
Non-trivial symmetries in quantum landscapes and their resilience to quantum noise
Enrico Fontana, M. Cerezo, A. Arrasmith +2 more·Nov 17, 2020
Very little is known about the cost landscape for parametrized Quantum Circuits (PQCs). Nevertheless, PQCs are employed in Quantum Neural Networks and Variational Quantum Algorithms, which may allow for near-term quantum advantage. Such applications ...
Quantum simulations of molecular systems with intrinsic atomic orbitals
Stefano Barison, D. Galli, M. Motta·Nov 16, 2020
Quantum simulations of quantum chemistry systems on quantum computers often employ minimal basis sets of Gaussian orbitals. In comparison with more realistic basis sets, quantum simulations employing minimal basis sets require fewer qubits and quantu...
Toward simulating superstring/M-theory on a quantum computer
H. Gharibyan, M. Hanada, Masazumi Honda +1 more·Nov 12, 2020
We present a novel framework for simulating matrix models on a quantum computer. Supersymmetric matrix models have natural applications to superstring/M-theory and gravitational physics, in an appropriate limit of parameters. Furthermore, for certain...
Comparative Study of Sampling-Based Simulation Costs of Noisy Quantum Circuits
Shigeo Hakkaku, K. Fujii·Nov 12, 2020
There have been intensive efforts to develop quantum computers, and the number of qubits is now reaching around 50 qubits. In practice, not only the number of qubits but the fidelity of the gates and measurements plays an important role. The noise in...
Quantum Assisted Simulator
Kishor Bharti, T. Haug·Nov 12, 2020
Quantum simulation offers a possibility to explore the exponentially large configuration space of quantum mechanical systems and thus help us study poorly understood topics such as high-temperature superconductivity and drug design. Here, we provide ...
Exponential Error Suppression for Near-Term Quantum Devices
B'alint Koczor·Nov 11, 2020
As quantum computers mature, quantum error correcting codes (QECs) will be adopted in order to suppress errors to any desired level $\mathcal{E}$ at a cost in qubit-count $n$ that is merely poly-logarithmic in $\mathcal{E}^{-1}$. However in the NISQ ...
Analog Quantum Simulation of Non-Condon Effects in Molecular Spectroscopy
Hamza Jnane, Nicolas P. D. Sawaya, B. Peropadre +3 more·Nov 11, 2020
In this work, we present a linear optical implementation for analog quantum simulation of molecular vibronic spectra, incorporating the non-Condon scattering operation with a quadratically small truncation error. Thus far, analog and digital quantum ...
Low-Depth Hamiltonian Simulation by an Adaptive Product Formula.
Zi-Jian Zhang, Jinzhao Sun, Xiao Yuan +1 more·Nov 10, 2020
Various Hamiltonian simulation algorithms have been proposed to efficiently study the dynamics of quantum systems on a quantum computer. The existing algorithms generally approximate the time evolution operators, which may need a deep quantum circuit...
Stoquastic simulations of non-stoquastic superconducting flux circuits
Harel Kol-Namer, Tom Halverson, Lalit Gupta +2 more·Nov 7, 2020
There is a tremendous interest in fabricating superconducting flux circuits that are nonstoquastic -- i.e., have positive off-diagonal matrix elements -- in their qubit representation, as these circuits are thought to be unsimulable by classical appr...