Papers
Live trends in quantum computing research, updated daily from arXiv.
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Qubit Platforms
Hardware platform mentions in abstracts — Photonic leads
Fast Estimation of Outcome Probabilities for Quantum Circuits
Hakop Pashayan, Oliver Reardon-Smith, K. Korzekwa +1 more·Jan 28, 2021
We present two classical algorithms for the simulation of universal quantum circuits on $n$ qubits constructed from $c$ instances of Clifford gates and $t$ arbitrary-angle $Z$-rotation gates such as $T$ gates. Our algorithms complement each other by ...
A highly tunable quadruple quantum dot in a narrow bandgap semiconductor InAs nanowire.
Jingwei Mu, Shaoyun Huang, Zhi-Hai Liu +7 more·Jan 27, 2021
Quantum dots (QDs) made from semiconductors are among the most promising platforms for the development of quantum computing and simulation chips, and they have the advantages of high density integration and compatibility with the standard semiconduct...
Quantum simulation of molecules without fermionic encoding of the wave function
D. Mazziotti, Scott E. Smart, A. Mazziotti·Jan 27, 2021
Molecular simulations generally require fermionic encoding in which fermion statistics are encoded into the qubit representation of the wave function. Recent calculations suggest that fermionic encoding of the wave function can be bypassed, leading t...
Broad-band spectroscopy of a vanadyl porphyrin: a model electronuclear spin qudit†
I. Gimeno, A. Urtizberea, Juan Román-Roche +5 more·Jan 27, 2021
We explore how to encode more than a qubit in vanadyl porphyrin molecules hosting a S = 1/2 electronic spin coupled to a I = 7/2 nuclear spin. The spin Hamiltonian and its parameters, as well as the spin dynamics, have been determined via a combinati...
Classical simulation of lossy boson sampling using matrix product operators
Changhun Oh, Kyungjoo Noh, Bill Fefferman +1 more·Jan 27, 2021
Characterizing the computational advantage from noisy intermediate-scale quantum (NISQ) devices is an important task from theoretical and practical perspectives. Here, we numerically investigate the computational power of NISQ devices focusing on bos...
Spin-Polarized Initialization and Readout for Single-Qubit State Tomography
M. B. Sambú, L. Sanz, F. M. Souza·Jan 26, 2021
We propose a theoretical protocol for reconstructing the density matrix of a single-electron spin qubit using spin-polarized transport. The system consists of a quantum dot coupled to ferromagnetic reservoirs and subject to a magnetic field lying in ...
Exploiting Symmetry Reduces the Cost of Training QAOA
Ruslan Shaydulin, Stefan M. Wild·Jan 25, 2021
A promising approach to the practical application of the quantum approximate optimization algorithm (QAOA) is finding QAOA parameters classically in simulation and sampling the solutions from QAOA with optimized parameters on a quantum computer. Doin...
Quantum Learning Based Nonrandom Superimposed Coding for Secure Wireless Access in 5G URLLC
Dongyang Xu, Pinyi Ren·Jan 24, 2021
Secure wireless access in ultra-reliable low-latency communications (URLLC), which is a critical aspect of 5G security, has become increasingly important due to its potential support of grant-free configuration. In grant-free URLLC, precise allocatio...
Machine learning of high dimensional data on a noisy quantum processor
E. Peters, J. Caldeira, A. Ho +6 more·Jan 23, 2021
Quantum kernel methods show promise for accelerating data analysis by efficiently learning relationships between input data points that have been encoded into an exponentially large Hilbert space. While this technique has been used successfully in sm...
Practical quantum encryption protocol with varying encryption configurations
Junxu Li, Zixuan Hu, S. Kais·Jan 22, 2021
Quantum communication is an important application that derives from the burgeoning field of quantum information and quantum computation. Focusing on secure communication, quantum cryptography has two major directions of development, namely quantum ke...
Improved Accuracy on Noisy Devices by Nonunitary Variational Quantum Eigensolver for Chemistry Applications.
F. Benfenati, G. Mazzola, Chiara Capecci +4 more·Jan 22, 2021
We propose a modification of the Variational Quantum Eigensolver algorithm for electronic structure optimization using quantum computers, named nonunitary Variational Quantum Eigensolver (nu-VQE), in which a nonunitary operator is combined with the o...
Quantum simulation of the ground-state Stark effect in small molecules: a case study using IBM Q
C. Tavares, S. Oliveira, V. Fernandes +2 more·Jan 22, 2021
As quantum computing approaches its first commercial implementations, quantum simulation emerges as a potentially ground-breaking technology for several domains, including biology and chemistry. However, taking advantage of quantum algorithms in quan...
Simulating quantum materials with digital quantum computers
Lindsay Bassman Oftelie, M. Urbánek, Mekena Metcalf +3 more·Jan 21, 2021
Quantum materials exhibit a wide array of exotic phenomena and practically useful properties. A better understanding of these materials can provide deeper insights into fundamental physics in the quantum realm as well as advance information processin...
Variational quantum solver employing the PDS energy functional
B. Peng, K. Kowalski·Jan 21, 2021
Recently a new class of quantum algorithms that are based on the quantum computation of the connected moment expansion has been reported to find the ground and excited state energies. In particular, the Peeters-Devreese-Soldatov (PDS) formulation is ...
Sparse Reconstruction for Radar Imaging Based on Quantum Algorithms
Xiao-wen Liu, Chen Dong, Ying Luo +3 more·Jan 21, 2021
The sparse-driven radar imaging can obtain high-resolution images about a target scene with the down-sampled data. However, the huge computational complexity of the classical sparse recovery method for the particular situation seriously affects the p...
Composable Programming of Hybrid Workflows for Quantum Simulation
Thien Nguyen, Lindsay Bassman, Dmitry I. Lyakh +6 more·Jan 20, 2021
We present a composable design scheme for the development of hybrid quantum/classical algorithms and workflows for applications of quantum simulation. Our object-oriented approach is based on constructing an expressive set of common data structures a...
Randomizing multi-product formulas for Hamiltonian simulation
Paul K. Faehrmann, M. Steudtner, R. Kueng +2 more·Jan 19, 2021
Quantum simulation, the simulation of quantum processes on quantum computers, suggests a path forward for the efficient simulation of problems in condensed-matter physics, quantum chemistry, and materials science. While the majority of quantum simula...
Noisy intermediate scale quantum simulation of time dependent Hamiltonians
J. Lau, Kishor Bharti, T. Haug +1 more·Jan 19, 2021
Quantum computers are expected to help us to achieve accurate simulation of the dynamics of many-body quantum systems. However, the limitations of current NISQ devices prevents us from realising this goal today. Recently an algorithm for performing q...
Simulating Energy Transfer in Molecular Systems with Digital Quantum Computers.
Chee-Kong Lee, Jonathan Wei Zhong Lau, Liang Shi +1 more·Jan 18, 2021
Quantum computers have the potential to simulate chemical systems beyond the capability of classical computers. Recent developments in hybrid quantum-classical approaches enable the determinations of the ground or low energy states of molecular syste...
Toward Cosmological Simulations of Dark Matter on Quantum Computers
Philip Mocz, Aaron Szasz·Jan 14, 2021
State-of-the-art cosmological simulations on classical computers are limited by time, energy, and memory usage. Quantum computers can perform some calculations exponentially faster than classical computers, using exponentially less energy and memory,...