Papers
Live trends in quantum computing research, updated daily from arXiv.
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Qubit Platforms
Hardware platform mentions in abstracts — Photonic leads
Machine learning for optimal parameter prediction in quantum key distribution
Wenyuan Wang, H. Lo·Dec 19, 2018
For a practical quantum key distribution (QKD) system, parameter optimization, the choice of intensities and the probabilities of sending them, is a crucial step in gaining optimal performance, especially when one realistically considers a finite com...
Beyond z=0. The Deutsch-Jozsa decided monochromatic languages
E. P. Marinho·Dec 19, 2018
The present work points out that the Deutsch-Jozsa algorithm was the first formal description of a quantum decider. In particular, it is studied here the class of languages whose indicator functions allow the Deutsch-Jozsa algorithm to output a monoc...
A Noncoherent Space-Time Code from Quantum Error Correction
S. Lanham, Travis C. Cuvelier, Corey I. Ostrove +3 more·Dec 18, 2018
In this work, we develop a space-time block code for noncoherent communication using techniques from the field of quantum error correction. We decompose the multiple-input multiple-output (MIMO) channel into operators from quantum mechanics, and desi...
Finite geometric toy model of spacetime as an error correcting code
P. L'evay, F. Holweck·Dec 18, 2018
A finite geometric model of space-time (which we call the bulk) is shown to emerge as a set of error correcting codes. The bulk is encoding a set of messages located in a blow up of the Gibbons-Hoffman-Wootters (GHW) discrete phase space for n-qubits...
QAOA for Max-Cut requires hundreds of qubits for quantum speed-up
G. Guerreschi, A. Y. Matsuura·Dec 18, 2018
Computational quantum technologies are entering a new phase in which noisy intermediate-scale quantum computers are available, but are still too small to benefit from active error correction. Even with a finite coherence budget to invest in quantum i...
Accuracy and Resource Estimations for Quantum Chemistry on a Near-term Quantum Computer.
Michael Kühn, S. Zanker, P. Deglmann +2 more·Dec 17, 2018
The study and prediction of chemical reactivity is one of the most important application areas of molecular quantum chemistry. Large-scale, fully error-tolerant quantum computers could provide exact or near-exact solutions to the underlying electroni...
Quantum annealing for systems of polynomial equations
Chia-Cheng Chang, A. Gambhir, T. Humble +1 more·Dec 17, 2018
Numerous scientific and engineering applications require numerically solving systems of equations. Classically solving a general set of polynomial equations requires iterative solvers, while linear equations may be solved either by direct matrix inve...
Error Mitigation in Quantum Computers subject to Spatially Correlated Noise
Vickram N. Premakumar, R. Joynt·Dec 17, 2018
The most common error models for quantum computers assume the independence of errors on different qubits. However, most noise mechanisms have some correlations in space. We show how to improve quantum information processing for few-qubit systems when...
Adaptive quantum state tomography with neural networks
Yihui Quek, Stanislav Fort, H. Ng·Dec 17, 2018
Current algorithms for quantum state tomography (QST) are costly both on the experimental front, requiring measurement of many copies of the state, and on the classical computational front, needing a long time to analyze the gathered data. Here, we i...
Reconfigurable quantum logic gates using Rashba controlled spin polarized currents
G. A. Nemnes, D. Dragoman·Dec 15, 2018
Abstract A reconfigurable logic gate is proposed in a two-dimensional double quantum wire system with a coupling window enabled by a Rashba field. Manipulating the spin states of incoming electrons several quantum logic gates (OR, AND, XOR, CNOT) can...
Quantum walk search on the complete bipartite graph
Mason L. Rhodes, T. G. Wong·Dec 14, 2018
The coined quantum walk is a discretization of the Dirac equation of relativistic quantum mechanics, and it is the basis of many quantum algorithms. We investigate how it searches the complete bipartite graph of $N$ vertices for one of $k$ marked ver...
Teleportation-based quantum homomorphic encryption scheme with quasi-compactness and perfect security
Min Liang·Dec 14, 2018
Quantum homomorphic encryption (QHE) is an important cryptographic technology for delegated quantum computation. It enables remote server to perform quantum computation on encrypted data, and the specific algorithm performed by Server is unnecessaril...
Quantum independent-set problem and non-Abelian adiabatic mixing
Biao Wu, Hongye Yu, F. Wilczek·Dec 14, 2018
We present an efficient quantum algorithm for some independent set problems in graph theory, based on non-abelian adiabatic mixing. We illustrate the performance of our algorithm with analysis and numerical calculations for two different types of gra...
Determination of Chern numbers with a phase-retrieval algorithm
Tomasz Szołdra, K. Sacha, A. Kosior·Dec 13, 2018
Ultracold atoms in optical lattices form a clean quantum simulator platform which can be utilized to examine topological phenomena and test exotic topological materials. Here we propose an experimental scheme to measure the Chern numbers of two-dimen...
Calculation of molecular vibrational spectra on a quantum annealer.
A. Teplukhin, B. Kendrick, D. Babikov·Dec 13, 2018
Until recently molecular energy calculations using quantum computing hardware have been limited to gate-based quantum computers. In this paper, a new methodology is presented to calculate the vibrational spectrum of a molecule on a quantum annealer. ...
Long-distance continuous-variable measurement-device-independent quantum key distribution with discrete modulation
Hongxin Ma, Peng Huang, Dongyun Bai +4 more·Dec 13, 2018
We propose a long-distance continuous-variable measurement-device-independent quantum key distribution (CV-MDI-QKD) protocol with discrete modulation. This kind of discrete-modulated schemes have good compatibility with efficient error correction cod...
Quantum Statistical Inference
Zhikuan Zhao·Dec 12, 2018
In this thesis, I present several results on quantum statistical inference in the following two directions. Firstly, I demonstrate that quantum algorithms can be applied to enhance the computing and training of Gaussian processes (GPs), a powerful mo...
Recommendation systems with the quantum k–NN and Grover algorithms for data processing
Marek Sawerwain, Marek Wróblewski·Dec 12, 2018
Abstract In this article, we discuss the implementation of a quantum recommendation system that uses a quantum variant of the k-nearest neighbours algorithm and the Grover algorithm to search for a specific element in an unstructured database. In add...
Combining the synergistic control capabilities of modeling and experiments: Illustration of finding a minimum-time quantum objective
Qiming Chen, Xiaodong Yang, C. Arenz +4 more·Dec 12, 2018
A common way to manipulate a quantum system, for example spins or artificial atoms, is to use properly tailored control pulses. In order to accomplish quantum information tasks before coherence is lost, it is crucial to implement the control in the s...
The role of entropy in topological quantum error correction
M. Beverland, Benjamin J. Brown, M. Kastoryano +1 more·Dec 12, 2018
The performance of a quantum error-correction process is determined by the likelihood that a random configuration of errors introduced to the system will lead to the corruption of encoded logical information. In this work we compare two different var...