Papers
Live trends in quantum computing research, updated daily from arXiv.
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Qubit Platforms
Hardware platform mentions in abstracts — Photonic leads
Quantum Sampling Algorithms for Near-Term Devices.
D. Wild, Dries Sels, H. Pichler +2 more·May 28, 2020
Efficient sampling from a classical Gibbs distribution is an important computational problem with applications ranging from statistical physics over Monte Carlo and optimization algorithms to machine learning. We introduce a family of quantum algorit...
Holographic Pseudo Entropy
Y. Nakata, T. Takayanagi, Yusuke Taki +2 more·May 28, 2020
We introduce a new quantity, called pseudo-entropy, as a generalization of entanglement entropy via postselection. We expect this quantity to provide a new class of order parameters in quantum many-body systems. In the anti--de Sitter space (AdS)/con...
OpenQL: A Portable Quantum Programming Framework for Quantum Accelerators
N. Khammassi, I. Ashraf, J. V. Someren +6 more·May 27, 2020
With the potential of quantum algorithms to solve intractable classical problems, quantum computing is rapidly evolving, and more algorithms are being developed and optimized. Expressing these quantum algorithms using a high-level language and making...
On the Complexity of Finding the Maximum Entropy Compatible Quantum State
Serena Di Giorgio, P. Mateus·May 27, 2020
Herein we study the problem of recovering a density operator from a set of compatible marginals, motivated by limitations of physical observations. Given that the set of compatible density operators is not singular, we adopt Jaynes’ principle and wis...
Investigating quantum approximate optimization algorithms under bang-bang protocols
Daniel Liang, Li Li, Stefan Leichenauer·May 27, 2020
The quantum approximate optimization algorithm (QAOA) is widely seen as a possible usage of noisy intermediate-scale quantum (NISQ) devices. We analyze the algorithm as a bang-bang protocol with fixed total time and a randomized greedy optimization s...
Quantum computation of eigenvalues within target intervals
Phillip W K Jensen, L. B. Kristensen, Jakob S. Kottmann +1 more·May 27, 2020
There is widespread interest in calculating the energy spectrum of a Hamiltonian, for example to analyze optical spectra and energy deposition by ions in materials. In this study, we propose a quantum algorithm that samples the set of energies within...
Architecture and noise analysis of continuous-variable quantum gates using two-dimensional cluster states
M. V. Larsen, Jonas S Neergaard-Nielsen, U. Andersen·May 27, 2020
Due to its unique scalability potential, continuous variable quantum optics is a promising platform for large scale quantum computing and quantum simulation. In particular, very large cluster states with a two-dimensional topology that are suitable f...
Single-qubit rotations in parameterized quantum circuits
S. E. Rasmussen, N. Loft, T. Bækkegaard +2 more·May 27, 2020
With the advent of hybrid quantum classical algorithms using parameterized quantum circuits the question of how to optimize these algorithms and circuits emerges. In this paper we show that the number of single-qubit rotations in parameterized quantu...
On connectivity-dependent resource requirements for digital quantum simulation of d-level particles
Nicolas P. D. Sawaya, G. Guerreschi, Adam Holmes·May 26, 2020
A primary objective of quantum computation is to efficiently simulate quantum physics. Scientifically and technologically important quantum Hamiltonians include those with spin-s, vibrational, photonic, and other bosonic degrees of freedom, i.e. prob...
Quantum Divide and Compute: Hardware Demonstrations and Noisy Simulations
T. Ayral, François-Marie Le Régent, Zain Saleem +2 more·May 26, 2020
Noisy, intermediate-scale quantum computers comewith intrinsic limitations in terms of the number of qubits (circuit "width") and decoherence time (circuit "depth") they can have. Here, for the first time, we demonstrate a recently introduced method ...
Quantum Algorithm for Approximating Maximum Independent Sets
Hongye 泓烨 Yu 余, F. Wilczek, Biao 飙 Wu 吴·May 26, 2020
We present a quantum algorithm for approximating maximum independent sets of a graph based on quantum non-Abelian adiabatic mixing in the sub-Hilbert space of degenerate ground states, which generates quantum annealing in a secondary Hamiltonian. For...
A Quantum Annealing Approach for Dynamic Multi-Depot Capacitated Vehicle Routing Problem
Ramkumar Harikrishnakumar, Saideep Nannapaneni, N. Nguyen +2 more·May 26, 2020
Quantum annealing (QA) is a quantum computing algorithm that works on the principle of Adiabatic Quantum Computation (AQC), and it has shown significant computational advantages in solving combinatorial optimization problems such as vehicle routing p...
Expressibility of the alternating layered ansatz for quantum computation
Kouhei Nakaji, N. Yamamoto·May 26, 2020
The hybrid quantum-classical algorithm is actively examined as a technique applicable even to intermediate-scale quantum computers. To execute this algorithm, the hardware efficient ansatz is often used, thanks to its implementability and expressibil...
Quantum mereology: Factorizing Hilbert space into subsystems with quasiclassical dynamics
S. Carroll, Ashmeet Singh·May 26, 2020
We study the question of how to decompose Hilbert space into a preferred tensor-product factorization without any pre-existing structure other than a Hamiltonian operator, in particular the case of a bipartite decomposition into "system" and "environ...
Circuit quantum electrodynamics
A. Blais, A. Grimsmo, S. Girvin +1 more·May 26, 2020
Quantum mechanical effects at the macroscopic level were first explored in Josephson junction-based superconducting circuits in the 1980's. In the last twenty years, the emergence of quantum information science has intensified research toward using t...
Noise Mitigation with Delay Pulses in the IBM Quantum Experience
Sam Tomkins, R. D. Sousa·May 26, 2020
One of the greatest challenges for current quantum computing hardware is how to obtain reliable results from noisy devices. A recent paper [A. Kandala et al., Nature 567, 491 (2019)] described a method for injecting noise by stretching gate times, en...
Large gradients via correlation in random parameterized quantum circuits
T. Volkoff, Patrick J. Coles·May 25, 2020
Scaling of variational quantum algorithms to large problem sizes requires efficient optimization of random parameterized quantum circuits. For such circuits with uncorrelated parameters, the presence of exponentially vanishing gradients in cost funct...
New perspectives on covariant quantum error correction
Sisi Zhou, Zi-Wen Liu, Liang Jiang·May 25, 2020
Covariant codes are quantum codes such that a symmetry transformation on the logical system could be realized by a symmetry transformation on the physical system, usually with limited capability of performing quantum error correction (an important ca...
Variability and Fidelity Limits of Silicon Quantum Gates Due to Random Interface Charge Traps
Tong Wu, Jing Guo·May 25, 2020
Silicon offers an attractive material platform for hardware realization of quantum computing. In this study, a microscopic stochastic simulation method is developed to model the effect of random interface charge traps in silicon metal-oxide-semicondu...
Quadratic Sieve Factorization Quantum Algorithm and its Simulation
A. Bhatia, Ajay Kumar·May 24, 2020
Quantum computing is a winsome field that concerns with the behaviour and nature of energy at the quantum level to improve the efficiency of computations. In recent years, quantum computation is receiving much attention for its capability to solve di...