Papers
Live trends in quantum computing research, updated daily from arXiv.
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13,591 papers in 12 months (-18% vs prior quarter)
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Qubit Platforms
Hardware platform mentions in abstracts — Photonic leads
Spin-controlled generation of indistinguishable and distinguishable photons from silicon vacancy centres in silicon carbide
N. Morioka, Charles Babin, R. Nagy +17 more·Jan 8, 2020
Quantum systems combining indistinguishable photon generation and spin-based quantum information processing are essential for remote quantum applications and networking. However, identification of suitable systems in scalable platforms remains a chal...
Quantum computation of dominant products in lithium-sulfur batteries.
J. Rice, Tanvi P. Gujarati, M. Motta +4 more·Jan 4, 2020
Quantum chemistry simulations of some industrially relevant molecules are reported, employing variational quantum algorithms for near-term quantum devices. The energies and dipole moments are calculated along the dissociation curves for lithium hydri...
Deep Q-learning decoder for depolarizing noise on the toric code
David Fitzek, Mattias Eliasson, A. F. Kockum +1 more·Dec 30, 2019
We present an AI-based decoding agent for quantum error correction of depolarizing noise on the toric code. The agent is trained using deep reinforcement learning (DRL), where an artificial neural network encodes the state-action Q-values of error-co...
Delocalized information in quantum networks
Jorge Miguel-Ramiro, W. Dur·Dec 30, 2019
We consider entanglement-based quantum networks where information is stored in a delocalized way within regions or the whole network. This offers a natural protection against failure of network nodes, loss and decoherence, and has built-in security f...
What do QAOA energies reveal about graphs
M. Szegedy·Dec 27, 2019
Quantum Approximate Optimization Algorithm (QAOA) is a hybrid classical-quantum algorithm to approximately solve NP optimization problems such as MAX-CUT. We describe a new application area of QAOA circuits: graph structure discovery. We omit the tim...
Block-encoding-based quantum algorithm for linear systems with displacement structures
Lin-Chun Wan, Chao-Hua Yu, Shijie Pan +3 more·Dec 27, 2019
Lin-Chun Wan, 2 Chao-Hua Yu, Shi-Jie Pan, Su-Juan Qin, ∗ Fei Gao, † and Qiao-Yan Wen ‡ State Key Laboratory of Networking and Switching Technology, Beijing University of Posts and Telecommunications, Beijing, 100876, China State Key Laboratory of Cry...
Framework for simulating gauge theories with dipolar spin systems
Di Luo, Jiayu Shen, Michael Highman +4 more·Dec 24, 2019
Gauge theories appear broadly in physics, ranging from the standard model of particle physics to long-wavelength descriptions of topological systems in condensed matter. However, systems with sign problems are largely inaccessible to classical comput...
Evaluation of the spectrum of a quantum system using machine learning based on incomplete information about the wavefunctions
G. Burlak·Dec 24, 2019
We propose an effective approach to rapid estimation of the energy spectrum of quantum systems with the use of machine learning (ML) algorithm. In the ML approach (back propagation), the wavefunction data known from experiments is interpreted as the ...
Soluble limit and criticality of fermions in Z2 gauge theories
E. König, P. Coleman, A. Tsvelik·Dec 23, 2019
Quantum information theory and strongly correlated electron systems share a common theme of macroscopic quantum entanglement. In both topological error correction codes and theories of quantum materials (spin liquid, heavy fermion and high-$T_c$ syst...
Decoding Quantum Error Correction Codes With Local Variation
M. Hanks, W. Munro, K. Nemoto·Dec 20, 2019
In this article, we investigate the role of local information in the decoding of the repetition and surface error correction codes for the protection of quantum states. Our key result is an improvement in resource efficiency when local information is...
Parity Detection of Propagating Microwave Fields
Jean-Claude Besse, S. Gasparinetti, M. Collodo +5 more·Dec 20, 2019
The parity of the number of elementary excitations present in a quantum system provides important insights into its physical properties. Parity measurements are used, for example, to tomographically reconstruct quantum states or to determine if a dec...
Decoherence in Molecular Electron Spin Qubits: Insights from Quantum Many-Body Simulations.
Jia Chen, Cong Hu, J. Stanton +3 more·Dec 19, 2019
Quantum states are described by wave functions whose phases cannot be directly measured, but which play a vital role in quantum effects such as interference and entanglement. The loss of the relative phase information, termed decoherence, arises from...
Introduction of spin centers in single crystals of Ba2CaWO6−δ
Mekhola Sinha, Tyler J. Pearson, Tim R. Reeder +4 more·Dec 18, 2019
Developing the field of quantum information science (QIS) hinges upon designing viable qubits, the smallest unit in quantum computing. One approach to creating qubits is introducing paramagnetic defects into semiconductors or insulators. This class o...
Quantum natural gradient generalized to noisy and nonunitary circuits
Bálint Koczor, S. Benjamin·Dec 18, 2019
Variational quantum algorithms are promising tools whose efficacy depends on their optimisation method. For noise-free unitary circuits, the quantum generalisation of natural gradient descent has been introduced and shown to be equivalent to imaginar...
Quantum Searchable Encryption for Cloud Data Based on Full-Blind Quantum Computation
Wenjie Liu, Yinsong Xu, Wenjie Liu +2 more·Dec 18, 2019
Searchable encryption (SE) is a positive way to protect users sensitive data in cloud computing setting, while preserving search ability on the server side, i.e., it allows the server to search encrypted data without leaking information about the pla...
Optimised fast gates for quantum computing with trapped ions
Evan P. G. Gale, Z. Mehdi, L. Oberg +3 more·Dec 17, 2019
We present an efficient approach to optimising pulse sequences for implementing fast entangling two-qubit gates on trapped ion quantum information processors. This a two-phase procedure for optimising gate fidelity. The first phase involves a global ...
Variational Quantum Circuits for Quantum State Tomography
Yong Liu, Dongyang Wang, Shichuan Xue +9 more·Dec 16, 2019
Quantum state tomography is a key process in most quantum experiments. In this work, we employ quantum machine learning for state tomography. Given an unknown quantum state, it can be learned by maximizing the fidelity between the output of a variati...
Scalable Bayesian Hamiltonian learning
T. Evans, R. Harper, S. Flammia·Dec 16, 2019
As the size of quantum devices continues to grow, the development of scalable methods to characterise and diagnose noise is becoming an increasingly important problem. Recent methods have shown how to efficiently estimate Hamiltonians in principle, b...
Selective acoustic control of photon-mediated qubit-qubit interactions
T. Neuman, Matthew E. Trusheim, P. Narang·Dec 12, 2019
Quantum technologies such as quantum sensing, quantum imaging, quantum communications, and quantum computing rely on the ability to actively manipulate the quantum state of light and matter. Quantum emitters, such as color centers trapped in solids, ...
Choi states, symmetry-based quantum gate teleportation, and stored-program quantum computing
Dongsheng Wang·Dec 12, 2019
The stored-program architecture is canonical in classical computing, while its power has not been fully recognized for the quantum case. We study quantum information processing with stored quantum program states, i.e., using qubits instead of bits to...