Papers
Live trends in quantum computing research, updated daily from arXiv.
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Hardware platform mentions in abstracts — Photonic leads
Projected cooling algorithm for quantum computation
Dean Lee, J. Bonitati, Gabriel Given +6 more·Oct 17, 2019
Abstract In the current era of noisy quantum devices, there is a need for quantum algorithms that are efficient and robust against noise. Towards this end, we introduce the projected cooling algorithm for quantum computation. The projected cooling al...
Single-step implementation of high-fidelity n -bit Toffoli gates
S. E. Rasmussen, K. Groenland, R. Gerritsma +2 more·Oct 17, 2019
The family of $n$-bit Toffoli gates, with the two-bit Toffoli gate as the figurehead, are of great interest in quantum information as they can be used as universal gates and in quantum error correction, among other things. We present a single-step im...
The Quantum Approximate Optimization Algorithm and the Sherrington-Kirkpatrick Model at Infinite Size
E. Farhi, J. Goldstone, S. Gutmann +1 more·Oct 17, 2019
The Quantum Approximate Optimization Algorithm (QAOA) is a general-purpose algorithm for combinatorial optimization problems whose performance can only improve with the number of layers p. While QAOA holds promise as an algorithm that can be run on n...
Designer Monte Carlo simulation for the Gross-Neveu-Yukawa transition
Yuzhi Liu, Wei Wang, K. Sun +1 more·Oct 16, 2019
In this paper, we study the quantum criticality of Dirac fermions via large-scale numerical simulations, focusing on the Gross-Neveu-Yukawa chiral-Ising quantum critical point (QCP) with critical bosonic modes coupled with Dirac fermions. We show tha...
Precise measurement of quantum observables with neural-network estimators
G. Torlai, G. Mazzola, Giuseppe Carleo +1 more·Oct 16, 2019
The measurement precision of modern quantum simulators is intrinsically constrained by the limited set of measurements that can be efficiently implemented on hardware. This fundamental limitation is particularly severe for quantum algorithms where co...
Quantum error-correction codes and absolutely maximally entangled states
P. Mazurek, M. Farkas, A. Grudka +2 more·Oct 16, 2019
For every stabiliser $N$-qudit absolutely maximally entangled state, we present a method for determining the stabiliser generators and logical operators of a corresponding quantum error correction code. These codes encode $k$ qudits into $N-k$ qudits...
A quantum memory at telecom wavelengths
A. Wallucks, I. Marinković, B. Hensen +2 more·Oct 16, 2019
Nanofabricated mechanical resonators are gaining significant momentum among potential quantum technologies due to their unique design freedom and independence from naturally occurring resonances. As their functionality is widely detached from materia...
AND-gates in ZX-calculus: Spider Nest Identities and QBC-completeness
Anthony Munson, B. Coecke, Quanlong Wang·Oct 15, 2019
In this paper we exploit the utility of the triangle symbol which has a complicated expression in terms of spider diagrams in ZX-calculus, and its role within the ZX-representation of AND-gates in particular. First, we derive spider nest identities w...
Quadrupolar interactions between acceptor pairs in p -doped semiconductors
A. Durst, Genesis Yang-Mejia, R. Bhatt +1 more·Oct 15, 2019
We consider the interaction between acceptor pairs in doped semiconductors in the limit of large inter-acceptor separation relevant for low doping densities. Modeling individual acceptors via the spherical model of Baldereschi and Lipari, we calculat...
Sampling-based sublinear low-rank matrix arithmetic framework for dequantizing Quantum machine learning
Nai-Hui Chia, András Gilyén, Tongyang Li +3 more·Oct 14, 2019
We present an algorithmic framework for quantum-inspired classical algorithms on close-to-low-rank matrices, generalizing the series of results started by Tang’s breakthrough quantum-inspired algorithm for recommendation systems [STOC’19]. Motivated ...
Noise-Resilient Quantum Dynamics Using Symmetry-Preserving Ansatzes
M. Otten, C. Cortes, S. Gray·Oct 14, 2019
We describe and demonstrate a method for the computation of quantum dynamics on small, noisy universal quantum computers. This method relies on the idea of `restarting' the dynamics; at least one approximate time step is taken on the quantum computer...
Compilation by stochastic Hamiltonian sparsification
Yingkai Ouyang, D. R. White, E. Campbell·Oct 14, 2019
Simulation of quantum chemistry is expected to be a principal application of quantum computing. In quantum simulation, a complicated Hamiltonian describing the dynamics of a quantum system is decomposed into its constituent terms, where the effect of...
Optimizing quantum phase estimation for the simulation of Hamiltonian eigenstates
P. M. Q. Cruz, G. Catarina, R. Gautier +1 more·Oct 14, 2019
We revisit quantum phase estimation algorithms for the purpose of obtaining the energy levels of many-body Hamiltonians and pay particular attention to the statistical analysis of their outputs. We introduce the mean phase direction of the parent dis...
Hawking radiation as stimulated emission
W. Wen·Oct 14, 2019
We regard the Parikh-Wilczek's tunnelling model of Hawking radiation as a quantum mechanical process of stimulated emission. The hypothesized microstates are found at the horizon with double degeneracy. A Jaynes-Cummings toy model for a black hole in...
One-loop universality of holographic codes
Xi Dong, D. Marolf·Oct 14, 2019
Recent work showed holographic error correcting codes to have simple universal features at O (1 /G ). In particular, states of fixed Ryu-Takayanagi (RT) area in such codes are associated with flat entanglement spectra indicating maximal entanglement ...
Quantum Algorithms for Mixed Binary Optimization Applied to Transaction Settlement
L. Braine, D. Egger, Jennifer R. Glick +1 more·Oct 13, 2019
In this article, we extend variational quantum optimization algorithms for quadratic unconstrained binary optimization problems to the class of mixed binary optimization problems. This allows us to combine binary decision variables with continuous de...
Computer-Inspired Concept for High-Dimensional Multipartite Quantum Gates.
Xiaoqin Gao, Manuel Erhard, A. Zeilinger +1 more·Oct 13, 2019
An open question in quantum optics is how to manipulate and control complex quantum states in an experimentally feasible way. Here we present concepts for transformations of high-dimensional multiphotonic quantum systems. The proposals rely on two ne...
Efficient simulation of random states and random unitaries
G. Alagic, Christian Majenz, A. Russell·Oct 13, 2019
We consider the problem of efficiently simulating random quantum states and random unitary operators, in a manner which is convincing to unbounded adversaries with black-box oracle access. This problem has previously only been considered for restric...
Quantum-Inspired Classical Algorithms for Singular Value Transformation
Dhawal Jethwani, F. Gall, S. Singh·Oct 13, 2019
A recent breakthrough by Tang (STOC 2019) showed how to "dequantize" the quantum algorithm for recommendation systems by Kerenidis and Prakash (ITCS 2017). The resulting algorithm, classical but "quantum-inspired", efficiently computes a low-rank app...
An Evolutionary Approach to Optimizing Communication Cost in Distributed Quantum Computation
M. Houshmand, Zahra Mohammadi, M. Z. Moghadam +1 more·Oct 12, 2019
Distributed quantum computing has been well-known for many years as a system composed of a number of small-capacity quantum circuits. Limitations in the capacity of monolithic quantum computing systems can be overcome by using distributed quantum sys...