Papers
Live trends in quantum computing research, updated daily from arXiv.
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Qubit Platforms
Hardware platform mentions in abstracts — Photonic leads
Lipkin model on a quantum computer
Michael J. Cervia, A. Balantekin, S. Coppersmith +5 more·Nov 8, 2020
Atomic nuclei are important laboratories for exploring and testing new insights into the universe, such as experiments to directly detect dark matter or explore properties of neutrinos. The targets of interest are often heavy, complex nuclei that cha...
Efficient classical calculation of the Quantum Natural Gradient
Tyson Jones·Nov 5, 2020
Quantum natural gradient has emerged as a superior minimisation technique in quantum variational algorithms. Classically simulating the algorithm running on near-future quantum hardware is paramount in its study, as it is for all variational algorith...
Quantum simulation and computing with Rydberg-interacting qubits
M. Morgado, Shannon Whitlock·Nov 5, 2020
Arrays of optically trapped atoms excited to Rydberg states have recently emerged as a competitive physical platform for quantum simulation and computing, where high-fidelity state preparation and readout, quantum logic gates and controlled quantum d...
Realization of a quantum Fredkin gate with hybrid degrees of freedom in a single photon
Feiran Wang, Shihao Ru, Yunlong Wang +3 more·Nov 4, 2020
Optimizing the physical realization of quantum gates is important to build a quantum computer. Fredkin gate, also named controlled-swap gate, can be widely applicable in various quantum information processing schemes. In the present research, we prop...
Post-Hartree–Fock method in quantum chemistry for quantum computer
Yutaka Shikano, Hiroshi C. Watanabe, Ken M. Nakanishi +1 more·Nov 3, 2020
Quantum computational chemistry is a potential application of quantum computers that is expected to effectively solve several quantum-chemistry problems, particularly the electronic structure problem. Quantum computational chemistry can be compared t...
Quantum simulation of light-front parton correlators
M. G. Echevarria, Í. Egusquiza, E. Rico +1 more·Nov 2, 2020
The physics of high-energy colliders relies on the knowledge of different non-perturbative parton correlators, such as parton distribution functions, that encode the information on universal hadron structure and are thus the main building blocks of a...
Evaluating the noise resilience of variational quantum algorithms
Enrico Fontana, Nathan Fitzpatrick, D. M. Ramo +2 more·Nov 2, 2020
We simulate the effects of different types of noise in state preparation circuits of variational quantum algorithms. We first use a variational quantum eigensolver to find the ground state of a Hamiltonian in presence of noise, and adopt two quality ...
Universal quantum computation and quantum error correction with ultracold atomic mixtures
V. Kasper, D. González-Cuadra, Apoorva Hegde +7 more·Oct 29, 2020
Quantum information platforms made great progress in the control of many-body entanglement and the implementation of quantum error correction, but it remains a challenge to realize both in the same setup. Here, we propose a mixture of two ultracold a...
Fast spin-valley-based quantum gates in Si with micromagnets
Peihao Huang, Xuedong Hu·Oct 28, 2020
An electron spin qubit in silicon quantum dots holds promise for quantum information processing due to the scalability and long coherence. An essential ingredient to recent progress is the employment of micromagnets. They generate a synthetic spin–or...
Deterministic multi-mode gates on a scalable photonic quantum computing platform
M. V. Larsen, Xueshi Guo, Casper R. Breum +2 more·Oct 27, 2020
Quantum computing can be realized with numerous different hardware platforms and computational protocols. A highly promising, and potentially scalable, idea is to combine a photonic platform with measurement-induced quantum information processing. In...
Nonlinear signal distortion corrections through quantum sensing
K. Chaves, Xian Wu, Y. Rosen +1 more·Oct 27, 2020
Having accurate gate generation is essential for precise control of a quantum system. The generated gate usually suffers from linear and nonlinear distortion. Previous works have demonstrated how to use a qubit to correct linear frequency distortions...
Differentiable quantum architecture search
Shi-Xin Zhang, Chang-Yu Hsieh, Shengyu Zhang +1 more·Oct 16, 2020
Quantum architecture search (QAS) is the process of automating architecture engineering of quantum circuits. It has been desired to construct a powerful and general QAS platform which can significantly accelerate current efforts to identify quantum a...
High-fidelity method for a single-step N -bit Toffoli gate in trapped ions
J. D. Arias Espinoza, K. Groenland, M. Mazzanti +2 more·Oct 16, 2020
Conditional multi-qubit gates are a key component for elaborate quantum algorithms. In a recent work, Rasmussen et al. (Phys. Rev. A 101, 022308) proposed an efficient single-step method for a prototypical multi-qubit gate, a Toffoli gate, based on a...
Readout rebalancing for near-term quantum computers
Rebecca Hicks, C. Bauer, B. Nachman·Oct 15, 2020
Readout errors are a significant source of noise for near term intermediate scale quantum computers. Mismeasuring a qubit as a 1 when it should be 0 occurs much less often than mismeasuring a qubit as a 0 when it should have been 1. We make the simpl...
Observation of separated dynamics of charge and spin in the Fermi-Hubbard model
F. Arute, K. Arya, R. Babbush +96 more·Oct 15, 2020
Strongly correlated quantum systems give rise to many exotic physical phenomena, including high-temperature superconductivity. Simulating these systems on quantum computers may avoid the prohibitively high computational cost incurred in classical app...
Neural Group Actions
Span Spanbauer, Luke Sciarappa·Oct 8, 2020
We introduce an algorithm for designing Neural Group Actions, collections of deep neural network architectures which model symmetric transformations satisfying the laws of a given finite group. This generalizes involutive neural networks $\mathcal{N}...
Efficient unstructured search implementation on current ion-trap quantum processors
Vladyslav Hlembotskyi, Rafal Burczy'nski, W. Jarnicki +2 more·Oct 8, 2020
So far, only the results on 3 qubit spaces (both on superconducting and ion-trap realisations of quantum processors) have beaten the classical unstructured search in the expected number of oracle calls using optimal protocols in both settings. We pre...
Generative machine learning with tensor networks: Benchmarks on near-term quantum computers
M. Wall, M. Abernathy, G. Quiroz·Oct 7, 2020
Noisy, intermediate-scale quantum (NISQ) computing devices have become an industrial reality in the last few years, and cloud-based interfaces to these devices are enabling exploration of near-term quantum computing on a range of problems. As NISQ de...
A Hardware-Aware Heuristic for the Qubit Mapping Problem in the NISQ Era
Siyuan Niu, Adrien Suau, G. Staffelbach +1 more·Oct 6, 2020
Due to several physical limitations in the realization of quantum hardware, today's quantum computers are qualified as noisy intermediate-scale quantum (NISQ) hardware. NISQ hardware is characterized by a small number of qubits (50 to a few hundred) ...
Modulated longitudinal gates on encoded spin qubits via curvature couplings to a superconducting cavity
R. Ruskov, C. Tahan·Oct 3, 2020
We propose entangling operations based on the energy curvature couplings of encoded spin qubits to a superconducting cavity, exploring the nonlinear qubit response to a gate voltage variation. For a two-qubit ($n$-qubit) entangling gate we explore ac...