Papers
Live trends in quantum computing research, updated daily from arXiv.
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15,749 papers in 12 months (-37% vs prior quarter)
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Qubit Platforms
Hardware platform mentions in abstracts — Photonic leads
Multilevel Combinatorial Optimization across Quantum Architectures
Hayato Ushijima-Mwesigwa, Ruslan Shaydulin, C. Negre +3 more·Oct 22, 2019
Emerging quantum processors provide an opportunity to explore new approaches for solving traditional problems in the post Moore’s law supercomputing era. However, the limited number of qubits makes it infeasible to tackle massive real-world datasets ...
Quantum fast Poisson solver: the algorithm and complete and modular circuit design
Shengbin Wang, Zhimin Wang, Wendong Li +3 more·Oct 22, 2019
The Poisson equation has applications across many areas of physics and engineering, such as the dynamic process simulation of ocean current. Here we present a quantum algorithm for solving Poisson equation, as well as a complete and modular circuit d...
Complex Density Wave Orders and Quantum Phase Transitions in a Model of Square-Lattice Rydberg Atom Arrays.
R. Samajdar, W. Ho, H. Pichler +2 more·Oct 21, 2019
We describe the zero-temperature phase diagram of a model of a two-dimensional square-lattice array of neutral atoms, excited into Rydberg states and interacting via strong van der Waals interactions. Using the density-matrix renormalization group al...
Hybrid purification and sampling approach for thermal quantum systems
J. Chen, E. Stoudenmire·Oct 21, 2019
We propose an algorithm which combines the beneficial aspects of two different methods for studying finite-temperature quantum systems with tensor networks. One approach is the ancilla method, which gives high-precision results but scales poorly at l...
Quantum-classical simulation of two-site dynamical mean-field theory on noisy quantum hardware
Trevor Keen, T. Maier, S. Johnston +1 more·Oct 21, 2019
We report on a quantum–classical simulation of the single-band Hubbard model using two-site dynamical mean-field theory (DMFT). Our approach uses IBM’s superconducting qubit chip to compute the zero-temperature impurity Green’s function in the time d...
Indexed improvements for real-time trotter evolution of a (1 + 1) field theory using NISQ quantum computers
Erik J. Gustafson, P. Dreher, Zheyue Hang +1 more·Oct 21, 2019
Today’s quantum computers offer the possibility of performing real-time calculations for quantum field theory scattering processes motivated by high energy physics. In order to follow the successful roadmap which has been established for the calculat...
Integrated photonic quantum technologies
Jianwei Wang, F. Sciarrino, A. Laing +1 more·Oct 21, 2019
Quantum technologies comprise an emerging class of devices capable of controlling superposition and entanglement of quantum states of light or matter, to realize fundamental performance advantages over ordinary classical machines. The technology of i...
A Domain-agnostic, Noise-resistant, Hardware-efficient Evolutionary Variational Quantum Eigensolver
Arthur G. Rattew, Shaohan Hu, Marco Pistoia +2 more·Oct 21, 2019
Variational quantum algorithms have shown promise in numerous fields due to their versatility in solving problems of scientific and commercial interest. However, leading algorithms for Hamiltonian simulation, such as the Variational Quantum Eigensolv...
Small quantum networks in the qudit stabilizer formalism
Daniel Miller·Oct 21, 2019
How much noise can a given quantum state tolerate without losing its entanglement? For qudits of arbitrary dimension, I investigate this question for two noise models: Global white noise, where a depolarizing channel is applied to all qudits simultan...
Leveraging Secondary Storage to Simulate Deep 54-qubit Sycamore Circuits
E. Pednault, John A. Gunnels, G. Nannicini +2 more·Oct 21, 2019
In a recent paper, we showed that secondary storage can extend the range of quantum circuits that can be practically simulated with classical algorithms. Here we refine those techniques and apply them to the simulation of Sycamore circuits with 53 an...
Obstacles to State Preparation and Variational Optimization from Symmetry Protection.
S. Bravyi, A. Kliesch, Robert Koenig +1 more·Oct 20, 2019
Local Hamiltonians with topological quantum order exhibit highly entangled ground states that cannot be prepared by shallow quantum circuits. Here, we show that this property may extend to all low-energy states in the presence of an on-site $\mathbb{...
Non-commutative graphs and quantum error correction for a two-mode quantum oscillator
G. Amosov, A. S. Mokeev, A. N. Pechen·Oct 20, 2019
An important topic in quantum information is the theory of error correction codes. Practical situations often involve quantum systems with states in an infinite-dimensional Hilbert space, for example, coherent states. Motivated by these practical nee...
A simple approach to design quantum neural networks and its applications to kernel-learning methods
Changpeng Shao·Oct 19, 2019
We give an explicit simple method to build quantum neural networks (QNNs) to solve classification problems. Besides the input (state preparation) and output (amplitude estimation), it has one hidden layer which uses a tensor product of $\log M$ two-d...
Rapid High-Fidelity Spin-State Readout in Si / Si - Ge Quantum Dots via rf Reflectometry
Elliot J. Connors, J. Nelson, J. Nichol·Oct 19, 2019
Silicon spin qubits show great promise as a scalable qubit platform for fault-tolerant quantum computing. However, fast high-fidelity readout of charge and spin states, which is required for quantum error correction, has remained elusive. Radio-frequ...
Flying Unicorn: Developing a Game for a Quantum Computer
Kory Becker·Oct 18, 2019
What is it like to create a game for a quantum computer? With its ability to perform calculations and processing in a distinctly different way than classical computers, quantum computing has the potential for becoming the next revolution in informati...
Optimal approximate quantum error correction for quantum metrology
Sisi Zhou, Liang Jiang·Oct 18, 2019
For a generic set of Markovian noise models, the estimation precision of a parameter associated with the Hamiltonian is limited by the $1/\sqrt{t}$ scaling where $t$ is the total probing time, in which case the maximal possible quantum improvement in...
Scalable quantum computing stabilised by optical tweezers on an ion crystal
Yu Shen, Guin-Dar Lin·Oct 18, 2019
As it has been demonstrated that trapped ion systems have unmatched long-lived quantum-bit (qubit) coherence and can support high-fidelity quantum manipulations, how to scale up the system size becomes an inevitable task for practical purposes. In th...
Quantum locally linear embedding for nonlinear dimensionality reduction
Xi He, Li Sun, Chufan Lyu +1 more·Oct 17, 2019
Reducing the dimension of nonlinear data is crucial in data processing and visualization. The locally linear embedding algorithm (LLE) is specifically a representative nonlinear dimensionality reduction method with maintaining well the original manif...
Quantum confinement of the Dirac surface states in topological-insulator nanowires
F. Münning, O. Breunig, H. F. Legg +5 more·Oct 17, 2019
The non-trivial topology of three-dimensional topological insulators dictates the appearance of gapless Dirac surface states. Intriguingly, when made into a nanowire, quantum confinement leads to a peculiar gapped Dirac sub-band structure. This gap i...
Quantum Simulation of Quantum $\mathbb{Z}_2$ Gauge Theory demonstrated in a GPU Simulator
Xiaopeng Cui, Ji-Chong Yang, Yu Shi·Oct 17, 2019
We outline a quantum simulation scheme of quantum $\mathbb{Z}_2$ gauge theory using quantum adiabatic algorithm implemented in terms of quantum circuit, and then demonstrate it in the classical simulator QuEST using a CUDA enabled GPU server. In part...