Papers
Live trends in quantum computing research, updated daily from arXiv.
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Qubit Platforms
Hardware platform mentions in abstracts — Photonic leads
Support vector machines on the D-Wave quantum annealer
D. Willsch, M. Willsch, H. Raedt +1 more·Jun 14, 2019
Kernel-based support vector machines (SVMs) are supervised machine learning algorithms for classification and regression problems. We present a method to train SVMs on a D-Wave 2000Q quantum annealer and study its performance in comparison to SVMs tr...
Mitigating coherent noise using Pauli conjugation
Z. Cai, Xiaosi Xu, S. Benjamin·Jun 14, 2019
Coherent noise can be much more damaging than incoherent (probabilistic) noise in the context of quantum error correction. One solution is to use twirling to turn coherent noise into incoherent Pauli channels. In this Article, we show that some of th...
Ergodicity probes: using time-fluctuations to measure the Hilbert space dimension
C. Nation, D. Porras·Jun 14, 2019
Quantum devices, such as quantum simulators, quantum annealers, and quantum computers, may be exploited to solve problems beyond what is tractable with classical computers. This may be achieved as the Hilbert space available to perform such `calculat...
Shrinking of operators in quantum error correction and AdS/CFT
Hayato Hirai·Jun 13, 2019
We first show that a class of operators acting on a given bipartite pure state on ℋA ⊗ ℋB can shrink its supports on ℋA ⊗ ℋB to only ℋA or ℋB while keeping its mappings. Using this result, we show how to systematically construct the decoders of the q...
Synthesizing Quantum Circuits via Numerical Optimization
T. Brugière, M. Baboulin, Benoît Valiron +1 more·Jun 12, 2019
We provide a simple framework for the synthesis of quantum circuits based on a numerical optimization algorithm. This algorithm is used in the context of the trapped-ions technology. We derive theoretical lower bounds for the number of quantum gates ...
Observation of information flow in the anti-𝒫𝒯-symmetric system with nuclear spins
Jingwei Wen, Guo-qing Qin, Chao Zheng +4 more·Jun 12, 2019
The recently theoretical and experimental researches on PT\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\od...
General Linear Group Action on Tensors: A Candidate for Post-Quantum Cryptography
Zhengfeng Ji, Youming Qiao, F. Song +1 more·Jun 11, 2019
Starting from the one-way group action framework of Brassard and Yung (Crypto '90), we revisit building cryptography based on group actions. Several previous candidates for one-way group actions no longer stand, due to progress both on classical algo...
Wave-function positivization via automatic differentiation
G. Torlai, J. Carrasquilla, M. Fishman +2 more·Jun 11, 2019
We introduce a procedure to systematically search for a local unitary transformation that maps a wavefunction with a non-trivial sign structure into a positive-real form. The transformation is parametrized as a quantum circuit compiled into a set of ...
Quantum algorithm for logistic regression
Hailing Liu, Chao-Hua Yu, Yusen Wu +4 more·Jun 10, 2019
Logistic regression (LR) is an important machine learning model for classification, with wide applications in text classification, image analysis and medicine diagnosis, etc. However, training LR generally entails an iterative gradient descent method...
Nonlocality test of energy-time entanglement via nonlocal dispersion cancellation with nonlocal detection
Baihong Li, Feiyan Hou, R. Quan +6 more·Jun 10, 2019
Energy-time entangled biphoton source plays a great role in quantum communication, quantum metrology and quantum cryptography due to its strong temporal correlation and capability of nonlocal dispersion cancellation. As a quantum effect, nonlocal dis...
Multi-label learning for improving discretely-modulated continuous-variable quantum key distribution.
Qin Liao, Hai Zhong, Ying Guo·Jun 10, 2019
Discretely-modulated continuous-variable quantum key distribution (CVQKD) is more suitable for long-distance transmission compared with its Gaussian-modulated CVQKD counterpart. However, its security can only be guaranteed when modulation variance is...
Eigenstate thermalization hypothesis and approximate quantum error correction
N. Bao, Newton Cheng·Jun 9, 2019
The eigenstate thermalization hypothesis (ETH) is a powerful conjecture for understanding how statistical mechanics emerges in a large class of many-body quantum systems. It has also been interpreted in a CFT context, and, in particular, holographic ...
Stochastic learning control of inhomogeneous quantum ensembles
Gabriel Turinici·Jun 7, 2019
In quantum control, the robustness with respect to uncertainties in the system's parameters or driving field characteristics is of paramount importance and has been studied theoretically, numerically and experiementally. We test in this paper stochas...
Generation of thermofield double states and critical ground states with a quantum computer
D. Zhu, S. Johri, N. Linke +7 more·Jun 6, 2019
Significance Our experiment prepares two types of nontrivial quantum states on a trapped ion quantum computer: the thermofield double state of the transverse-field Ising model at arbitrary temperature and the quantum critical state of the zero-temper...
How the High-energy Part of the Spectrum Affects the Adiabatic Computation Gap
Yosi Atia, D. Aharonov·Jun 6, 2019
Towards better understanding of how to design efficient adiabatic quantum algorithms, we study how the adiabatic gap depends on the spectra of the initial and final Hamiltonians in a natural family of test-bed examples. We show that perhaps counter-i...
Quantum Approximate Optimization with a Trapped-Ion Quantum Simulator
G. Pagano, A. Bapat, P. Becker +13 more·Jun 6, 2019
Quantum computers and simulators may offer significant advantages over their classical counterparts, providing insights into quantum many-body systems and possibly solving exponentially hard problems, such as optimization and satisfiability. Here we ...
Spatial noise correlations in a Si/SiGe two-qubit device from Bell state coherences
J. Boter, X. Xue, T. Krähenmann +10 more·Jun 6, 2019
We study spatial noise correlations in a Si/SiGe two-qubit device with integrated micromagnets. Our method relies on the concept of decoherence-free subspaces, whereby we measure the coherence time for two different Bell states, designed to be sensit...
Quantum Distributed Algorithm for the All-Pairs Shortest Path Problem in the CONGEST-CLIQUE Model
Taisuke Izumi, F. Gall·Jun 6, 2019
The All-Pairs Shortest Path problem (APSP) is one of the most central problems in distributed computation. In the CONGEST-CLIQUE model, in which n nodes communicate with each other over a fully connected network by exchanging messages of O(łog n) bit...
The Problem of Dynamic Programming on a Quantum Computer
Pooya Ronagh·Jun 5, 2019
We discuss the problem of finite-horizon dynamic programming (DP) on a quantum computer. We introduce a query model for studying quantum and classical algorithms for solving DP problems, and provide example oracle constructions for the travelling sal...
One-dimensional error-correcting code for Majorana qubits
John P. T. Stenger, Roger S. K. Mong·Jun 5, 2019
Although Majorana platforms are promising avenues to realizing topological quantum computing, they are still susceptible to errors from thermal noise and other sources. We show that the error rate of Majorana qubits can be drastically reduced using a...