Papers
Live trends in quantum computing research, updated daily from arXiv.
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Hardware platform mentions in abstracts — Photonic leads
Improved techniques for preparing eigenstates of fermionic Hamiltonians
D. Berry, M. Kieferová, A. Scherer +5 more·Nov 28, 2017
Modeling low energy eigenstates of fermionic systems can provide insight into chemical reactions and material properties and is one of the most anticipated applications of quantum computing. We present three techniques for reducing the cost of prepar...
Merlin-Arthur with efficient quantum Merlin and quantum supremacy for the second level of the Fourier hierarchy
T. Morimae, Yuki Takeuchi, H. Nishimura·Nov 28, 2017
We introduce a simple sub-universal quantum computing model, which we call the Hadamard-classical circuit with one-qubit (HC1Q) model. It consists of a classical reversible circuit sandwiched by two layers of Hadamard gates, and therefore it is in th...
One-way quantum computing in superconducting circuits
F. Albarr'an-Arriagada, G. A. Barrios, M. Sanz +4 more·Nov 28, 2017
We propose a method for the implementation of one-way quantum computing in superconducting circuits. Measurement-based quantum computing is a universal quantum computation paradigm in which an initial cluster-state provides the quantum resource, whil...
Quantum speedup to some types of polynomial equations
Changpeng Shao·Nov 27, 2017
In this paper, we consider three types of polynomial equations in quantum computer: linear divisibility equation, which belongs to a special type of binary-quadratic Diophantine equation; quadratic congruence equation with restriction in the solution...
Quantum Artificial Life in an IBM Quantum Computer
U. Alvarez-Rodriguez, M. Sanz, L. Lamata +1 more·Nov 26, 2017
We present the first experimental realization of a quantum artificial life algorithm in a quantum computer. The quantum biomimetic protocol encodes tailored quantum behaviors belonging to living systems, namely, self-replication, mutation, interactio...
Approximating the Permanent of a Random Matrix with Vanishing Mean
Lior Eldar, S. Mehraban·Nov 26, 2017
The permanent is #P-hard to compute exactly on average for natural random matrices including matrices over finite fields or Gaussian ensembles. Should we expect that it remains #P-hard to compute on average if we only care about approximation instead...
Efficient quantum circuit for singular-value thresholding
Bo-jia Duan, Jiabin Yuan, Y. Liu +1 more·Nov 24, 2017
Singular value thresholding (SVT) operation is a fundamental core module in many mathematical models in computer vision and machine learning, particularly for many nuclear norm minimizing-based problems. We presented a quantum SVT (QSVT) algorithm wh...
Decoherence-Free Interaction between Giant Atoms in Waveguide Quantum Electrodynamics.
A. F. Kockum, G. Johansson, F. Nori·Nov 24, 2017
In quantum-optics experiments with both natural and artificial atoms, the atoms are usually small enough that they can be approximated as pointlike compared to the wavelength of the electromagnetic radiation with which they interact. However, superco...
Speeding up thermalisation via open quantum system variational optimisation
Nishchay Suri, F. Binder, B. Muralidharan +1 more·Nov 23, 2017
Optimising open quantum system evolution is an important step on the way to achieving quantum computing and quantum thermodynamic tasks. In this article, we approach optimisation via variational principles and derive an open quantum system variationa...
Randomized Benchmarking Using Unitary t-Design for Average Fidelity Estimation of Practical Quantum Circuit
Linxi Zhang, Chuanghua Zhu, Changxing Pei·Nov 22, 2017
Randomized benchmarking is a useful scheme for characterizing the noise in quantum system. However, it is insensitive to practical unitary errors. We propose a method of applying unitary t-design in quantum process tomography with local random unitar...
Strictly local one-dimensional topological quantum error correction with symmetry-constrained cellular automata
Nicolai Lang, H. P. Buchler·Nov 22, 2017
Active quantum error correction on topological codes is one of the most promising routes to long-term qubit storage. In view of future applications, the scalability of the used decoding algorithms in physical implementations is crucial. In this work,...
Robust quantum state transfer via topological edge states in superconducting qubit chains
F. Mei, Gang Chen, L. Tian +2 more·Nov 21, 2017
Robust quantum state transfer (QST) is an indispensable ingredient in scalable quantum information processing. Here we present an experimentally feasible mechanism for realizing robust QST via topologically protected edge states in superconducting qu...
Understanding Quantum Tunneling using Diffusion Monte Carlo Simulations
E. Inack, G. Giudici, T. Parolini +2 more·Nov 21, 2017
In simple ferromagnetic quantum Ising models characterized by an effective double-well energy landscape the characteristic tunneling time of path-integral Monte Carlo (PIMC) simulations has been shown to scale as the incoherent quantum-tunneling time...
An algorithm to explore entanglement in small systems
Robin Reuvers·Nov 21, 2017
A quantum state’s entanglement across a bipartite cut can be quantified with entanglement entropy or, more generally, Schmidt norms. Using only Schmidt decompositions, we present a simple iterative algorithm to maximize Schmidt norms. Depending on th...
Superconducting gatemon qubit based on a proximitized two-dimensional electron gas
L. Casparis, M. Connolly, M. Kjaergaard +11 more·Nov 21, 2017
The coherent tunnelling of Cooper pairs across Josephson junctions (JJs) generates a nonlinear inductance that is used extensively in quantum information processors based on superconducting circuits, from setting qubit transition frequencies1 and int...
Quantum Inspired Security on a Mobile Phone
Yu Qin, Wan Li·Nov 20, 2017
The widespread use of mobile electronic devices increases the complexities of mobile security. This paper aims to provide a secure communication environment for smartphone users. Some research proves that the one-time pad is one of the securest encry...
Molecular spin qudits for quantum algorithms.
E. Moreno‐Pineda, C. Godfrin, F. Balestro +2 more·Nov 20, 2017
Presently, one of the most ambitious technological goals is the development of devices working under the laws of quantum mechanics. One prominent target is the quantum computer, which would allow the processing of information at quantum level for pur...
A Quantum Walk Enhanced Grover Search Algorithm for Global Optimization
Yan Wang·Nov 18, 2017
One of the significant breakthroughs in quantum computation is Grover's algorithm for unsorted database search. Recently, the applications of Grover's algorithm to solve global optimization problems have been demonstrated, where unknown optimum solut...
Interference and correlated coherence in disordered and localized quantum walk
Shivani Singh, C. M. Chandrashekar·Nov 16, 2017
Quantum walk has played an important role in development of quantum algorithms and protocols for quantum simulations. The speedup observed in quantum walk algorithms is attributed to quantum interference of spreading wave packet in position space. Si...
A Quantum Circuit to Construct All Maximal Cliques Using Grover Search Algorithm
C. Wie·Nov 16, 2017
A quantum circuit to construct all maximal cliques using Grover search algorithm is presented. This oracle circuit takes as input an n-qubit state |x> and the adjacency matrix data A of an n-node network, and outputs the state (-1)^f(x) |x> where f(x...