Papers
Live trends in quantum computing research, updated daily from arXiv.
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Hardware platform mentions in abstracts — Photonic leads
Quantum-enhanced least-square support vector machine: Simplified quantum algorithm and sparse solutions
Jie Lin, Dan-Bo Zhang, Shuo Zhang +3 more·Aug 5, 2019
Abstract Quantum algorithms can enhance machine learning in different aspects. Here, we study quantum-enhanced least-square support vector machine (LS-SVM). Firstly, a novel quantum algorithm that uses continuous variable to assist matrix inversion i...
A quantum algorithm to count weighted ground states of classical spin Hamiltonians
Bhuvanesh Sundar, Roger Paredes, D. Damanik +2 more·Aug 5, 2019
Ground state counting plays an important role in several applications in science and engineering, from estimating residual entropy in physical systems, to bounding engineering reliability and solving combinatorial counting problems. While quantum alg...
The Role of Multiplicative Complexity in Compiling Low $T$-count Oracle Circuits
Giulia Meuli, Mathias Soeken, E. Campbell +2 more·Aug 5, 2019
We present a constructive method to create quantum circuits that implement oracles <tex>$\vert x\rangle\vert y\rangle\vert 0\rangle^{k}\mapsto\vert x\rangle\vert y\oplus f(x)\rangle\vert 0\rangle^{k}$</tex> for <tex>$n$</tex>-variable Boolean functio...
Seeding the Singularity for A.I
P. Kraikivski·Aug 4, 2019
The singularity refers to an idea that once a machine having an artificial intelligence surpassing the human intelligence capacity is created, it will trigger explosive technological and intelligence growth. I propose to test the hypothesis that mach...
Completely positive master equation for arbitrary driving and small level spacing
E. Mozgunov, Daniel A. Lidar·Aug 3, 2019
Markovian master equations are a ubiquitous tool in the study of open quantum systems, but deriving them from first principles involves a series of compromises. On the one hand, the Redfield equation is valid for fast environments (whose correlation ...
Scalable preparation of Dicke states for quantum sensing
M. Johnsson, Nabomita Roy Mukty, D. Burgarth +2 more·Aug 3, 2019
We present a quantum control strategy for preparing Dicke states on spin ensembles for use in superabsorption and precision metrology. The method uses a dispersive coupling of $n$ spins to a common bosonic mode and does not require selective addressi...
Quantum Higher Order Singular Value Decomposition
Lejia Gu, Xiaoqiang Wang, Guofeng Zhang·Aug 2, 2019
Higher order singular value decomposition (HOSVD) is an important tool for analyzing big data in multilinear algebra and machine learning. In this paper, we present a quantum algorithm for higher order singular value decomposition. Our method allows ...
Machine-learning based three-qubit gate for realization of a Toffoli gate with cQED-based transmon systems
Sahar Daraeizadeh, S. Premaratne, Xiaoyu Song +2 more·Aug 2, 2019
We use machine learning techniques to design a 50 ns three-qubit flux-tunable controlled-controlled-phase gate with fidelity of>99.99% for nearest-neighbor coupled transmons in circuit quantum electrodynamics architectures. We explain our gate design...
Optimal clock speed of qubit gate operations on open quantum systems
Nilanjana Chanda, R. Bhattacharyya·Aug 1, 2019
Efficient implementation of quantum algorithms requires single- or multiple-qubit gates with high fidelity. Here we report that the fidelity of gate operations on open quantum systems has a maximum value corresponding to an optimum value of the drive...
Exact quantum search based on analytical multiphase matching for known number of target items and the experimental demonstration on IBM Q
Tan Li, Xiangqun Fu, Yang Wang +4 more·Aug 1, 2019
In [Phys. Rev. Lett. 113, 210501 (2014)], to achieve the optimal fixed-point quantum search in the case of unknown fraction (denoted by $\lambda$) of target items, the analytical multiphase matching (AMPM) condition has been proposed. In this paper, ...
GPU-based Ising Computing for Solving Balanced Min-Cut Graph Partitioning Problem
Chase Cook, Wentian Jin, S. Tan·Aug 1, 2019
Ising computing provides a new computing paradigm for many hard combinatorial optimization problems. Ising computing essentially tries to solve the quadratic unconstrained binary optimization problem, which is also described by the Ising spin glass m...
Minimizing State Preparations in Variational Quantum Eigensolver by Partitioning into Commuting Families
P. Gokhale, Olivia Angiuli, Yongshan Ding +5 more·Jul 31, 2019
Variational quantum eigensolver (VQE) is a promising algorithm suitable for near-term quantum machines. VQE aims to approximate the lowest eigenvalue of an exponentially sized matrix in polynomial time. It minimizes quantum resource requirements both...
Computational universality of symmetry-protected topologically ordered cluster phases on 2D Archimedean lattices
Austin K. Daniel, R. N. Alexander, A. Miyake·Jul 31, 2019
What kinds of symmetry-protected topologically ordered (SPTO) ground states can be used for universal measurement-based quantum computation in a similar fashion to the 2D cluster state? 2D SPTO states are classified not only by global on-site symmetr...
Quantum Error Correction with the GKP Code and Concatenation with Stabilizer Codes
Yang Wang·Jul 31, 2019
Gottesman, Kitaev and Preskill have proposed a scheme to encode a qubit in a harmonic oscillator, which is called the GKP code. It is designed to be resistant to small shift errors contained in momentum and position quadratures. Thus there's some int...
Spin-2 BEC spinor superfluid soliton-soliton scattering in one and two space dimensions.
Jasper Taylor, Steven Smith, J. Yepez·Jul 30, 2019
Presented is a study of a spin-2 Bose-Einstein condensate (BEC) by unitary quantum simulations of time-dependent soliton-soliton scattering. The quantum simulation method is based on a quantum lattice algorithm which is designed for implementation on...
Classical and Quantum Algorithms for Tensor Principal Component Analysis
M. Hastings·Jul 30, 2019
We present classical and quantum algorithms based on spectral methods for a problem in tensor principal component analysis. The quantum algorithm achieves a quartic speedup while using exponentially smaller space than the fastest classical spectral a...
Efficient and noise resilient measurements for quantum chemistry on near-term quantum computers
W. Huggins, J. McClean, N. Rubin +4 more·Jul 30, 2019
Variational algorithms are a promising paradigm for utilizing near-term quantum devices for modeling electronic states of molecular systems. However, previous bounds on the measurement time required have suggested that the application of these techni...
Randomness? What Randomness?
K. Landsman·Jul 30, 2019
This is a review of the issue of randomness in quantum mechanics, with special emphasis on its ambiguity; for example, randomness has different antipodal relationships to determinism, computability, and compressibility. Following a (Wittgensteinian) ...
Efficient Estimation of Pauli Channels
S. Flammia, Joel J. Wallman·Jul 30, 2019
Pauli channels are ubiquitous in quantum information, both as a dominant noise source in many computing architectures and as a practical model for analyzing error correction and fault tolerance. Here, we prove several results on efficiently learning ...
Scalable characterization of localizable entanglement in noisy topological quantum codes
D. Amaro, M. Muller, A. Pal·Jul 30, 2019
Topological quantum error correcting codes have emerged as leading candidates towards the goal of achieving large-scale fault-tolerant quantum computers. However, quantifying entanglement in these systems of large size in the presence of noise is a c...