Papers
Live trends in quantum computing research, updated daily from arXiv.
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Qubit Platforms
Hardware platform mentions in abstracts — Photonic leads
Finding the optimal Nash equilibrium in a discrete Rosenthal congestion game using the Quantum Alternating Operator Ansatz
Mark Hodson, Brendan Ruck, Hugh Ong +2 more·Aug 20, 2020
This paper establishes the tractability of finding the optimal Nash equilibrium, as well as the optimal social solution, to a discrete congestion game using a gate-model quantum computer. The game is of the type originally posited by Rosenthal in the...
Protocol Discovery for the Quantum Control of Majoranas by Differentiable Programming and Natural Evolution Strategies
Luuk Coopmans, Di Luo, G. Kells +2 more·Aug 20, 2020
Quantum control, which refers to the active manipulation of physical systems described by the laws of quantum mechanics, constitutes an essential ingredient for the development of quantum technology. Here we apply Differentiable Programming (DP) and ...
The Quantum Supremacy Tsirelson Inequality
William Kretschmer·Aug 20, 2020
<jats:p>A leading proposal for verifying near-term quantum supremacy experiments on noisy random quantum circuits is linear cross-entropy benchmarking. For a quantum circuit <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mi>C</mml:mi><...
Scattering in the Ising model with the quantum Lanczos algorithm
Kubra Yeter-Aydeniz, G. Siopsis, R. Pooser·Aug 20, 2020
Time evolution and scattering simulation in phenomenological models are of great interest for testing and validating the potential for near-term quantum computers to simulate quantum field theories. Here, we simulate one-particle propagation and two-...
Momentum-Space Unitary Couple Cluster and Translational Quantum Subspace Expansion for Periodic Systems on Quantum Computers
D. Manrique, I. Khan, Kentaro Yamamoto +2 more·Aug 19, 2020
We demonstrate the use of the Variational Quantum Eigensolver (VQE) to simulate solid state crystalline materials. We adapt the Unitary Coupled Cluster ansatz to periodic boundary conditions in real space and momentum space representations and direct...
Portfolio Optimization of 60 Stocks Using Classical and Quantum Algorithms
Jeffrey Cohen, Alex Khan, Clark Alexander·Aug 19, 2020
We continue to investigate the use of quantum computers for building an optimal portfolio out of a universe of 60 U.S. listed, liquid equities. Starting from historical market data, we apply our unique problem formulation on the D-Wave Systems Inc. D...
Low-Depth Mechanisms for Quantum Optimization
J. McClean, M. Harrigan, M. Mohseni +6 more·Aug 19, 2020
One of the major application areas of interest for both near-term and fault-tolerant quantum computers is the optimization of classical objective functions. In this work, we develop intuitive constructions for a large class of these algorithms based ...
Demonstration of quantum volume 64 on a superconducting quantum computing system
P. Jurcevic, Ali Javadi-Abhari, L. Bishop +28 more·Aug 19, 2020
We improve the quality of quantum circuits on superconducting quantum computing systems, as measured by the quantum volume (QV), with a combination of dynamical decoupling, compiler optimizations, shorter two-qubit gates, and excited state promoted r...
Delayed-choice causal order and nonclassical correlations
S. Milz, Dominic Jurkschat, F. A. Pollock +1 more·Aug 18, 2020
Recent frameworks describing quantum mechanics in the absence of a global causal order admit the existence of causally indefinite processes, where it is impossible to ascribe causal order for events A and B. These frameworks even allow for processes ...
Microcanonical and finite-temperature ab initio molecular dynamics simulations on quantum computers
I. O. Sokolov, P. Barkoutsos, Lukas Moeller +3 more·Aug 18, 2020
Ab initio molecular dynamics (AIMD) is a powerful tool to predict properties of molecular and condensed matter systems. The quality of this procedure is based on accurate electronic structure calculations. The development of quantum processors has sh...
Adiabatic Quantum Optimization Fails to Solve the Knapsack Problem
Lauren Pusey-Nazzaro, Prasanna Date·Aug 17, 2020
In this work, we attempt to solve the integer-weight knapsack problem using the D-Wave 2000Q adiabatic quantum computer. The knapsack problem is a well-known NP-complete problem in computer science, with applications in economics, business, finance, ...
Mutual information-assisted adaptive variational quantum eigensolver
Zi-Jian Zhang, T. Kyaw, Jakob S. Kottmann +2 more·Aug 17, 2020
Adaptive construction of ansatz circuits offers a promising route towards applicable variational quantum eigensolvers on near-term quantum hardware. Those algorithms aim to build up optimal circuits for a certain problem and ansatz circuits are adapt...
Improved description of trapped ions as an electro-mechanical system
N. V. Horne, M. Mukherjee·Aug 17, 2020
Trapped ions are among the leading candidates for quantum computing technologies. Interfacing ion qubits in separate traps and interfacing ion qubits with superconducting qubits are two of the many challenges to scale up quantum computers. One approa...
High-Fidelity Controlled-Z Gate with Maximal Intermediate Leakage Operating at the Speed Limit in a Superconducting Quantum Processor.
V. Negîrneac, H. Ali, N. Muthusubramanian +10 more·Aug 17, 2020
Simple tuneup of fast two-qubit gates is essential for the scaling of quantum processors. We introduce the sudden variant (SNZ) of the net zero scheme realizing controlled-Z (CZ) gates by flux control of transmon frequency. SNZ CZ gates realized in a...
Robustness Verification of Quantum Classifiers
J. Guan, Wang Fang, M. Ying·Aug 17, 2020
Several important models of machine learning algorithms have been successfully generalized to the quantum world, with potential speedup to training classical classifiers and applications to data analytics in quantum physics that can be implemented on...
Discretized quantum adiabatic process for free fermions and comparison with the imaginary-time evolution
T. Shirakawa, K. Seki, S. Yunoki·Aug 17, 2020
Motivated by recent progress of quantum technologies, we study a discretized quantum adiabatic process for a one-dimensional free fermion system described by a variational wave function, i.e., a parametrized quantum circuit. The wave function is comp...
Certified quantum gates
W. Campbell·Aug 17, 2020
High quality, fully-programmable quantum processors are available with small numbers (<1000) of qubits, and the scientific potential of these near term machines is not well understood. If the small number of physical qubits precludes practical quantu...
A quantum circuit simulator and its applications on Sunway TaihuLight supercomputer
Zhimin Wang, Zhao-Yun Chen, Shengbin Wang +4 more·Aug 17, 2020
Classical simulation of quantum computation is vital for verifying quantum devices and assessing quantum algorithms. We present a new quantum circuit simulator developed on the Sunway TaihuLight supercomputer. Compared with other simulators, the pres...
Bounds on the $\mathrm{QAC}^0$ Complexity of Approximating Parity
G. Rosenthal·Aug 17, 2020
$\mathrm{QAC}$ circuits are quantum circuits with one-qubit gates and Toffoli gates of arbitrary arity. $\mathrm{QAC}^0$ circuits are $\mathrm{QAC}$ circuits of constant depth, and are quantum analogues of $\mathrm{AC}^0$ circuits. We prove the follo...
Merged-Element Transmon
R. Zhao, S. Park, T. Zhao +4 more·Aug 17, 2020
Transmon qubits are ubiquitous in the pursuit of quantum computing using superconducting circuits. However, they have some drawbacks that still need to be addressed. Most importantly, the scalability of transmons is limited by the large device footpr...