Papers
Live trends in quantum computing research, updated daily from arXiv.
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Qubit Platforms
Hardware platform mentions in abstracts — Photonic leads
Hybrid light-matter networks of Majorana zero modes
L. Contamin, M. Delbecq, B. Douçot +2 more·Mar 30, 2021
Topological excitations, such as Majorana zero modes, are a promising route for encoding quantum information. Topologically protected gates of Majorana qubits, based on their braiding, will require some form of network. Here, we propose to build such...
Composably secure data processing for Gaussian-modulated continuous-variable quantum key distribution
Alexander G. Mountogiannakis, Panagiotis Papanastasiou, B. Braverman +1 more·Mar 30, 2021
Continuous-variable (CV) quantum key distribution (QKD) employs the quadratures of a bosonic mode to establish a secret key between two remote parties, and this is usually achieved via a Gaussian modulation of coherent states. The resulting secret ke...
Topological-Graph Dependencies and Scaling Properties of a Heuristic Qubit-Assignment Algorithm
M. Steinberg, Sebastian Feld, C. G. Almudéver +2 more·Mar 29, 2021
The qubit-mapping problem aims to assign and route qubits of a quantum circuit onto an noisy intermediate-scale quantum (NISQ) device in an optimized fashion, with respect to some cost function. Finding an optimal solution to this problem is known to...
ZX-Calculus and Extended Wolfram Model Systems II: Fast Diagrammatic Reasoning with an Application to Quantum Circuit Simplification
Jonathan Gorard, Manojna Namuduri, X. Arsiwalla·Mar 29, 2021
This article presents a novel algorithmic methodology for performing automated diagrammatic deductions over combinatorial structures, using a combination of modified equational theorem-proving techniques and the extended Wolfram model hypergraph rewr...
Digital-Analog Quantum Simulation of Fermionic Models
L. Céleri, D. Huerga, F. Albarr'an-Arriagada +3 more·Mar 29, 2021
Simulating quantum many-body systems is a highly demanding task since the required resources grow exponentially with the dimension of the system. In the case of fermionic systems, this is even harder since nonlocal interactions emerge due to the anti...
Variational quantum algorithms to estimate rank, quantum entropies, fidelity, and Fisher information via purity minimization
K. C. Tan, T. Volkoff·Mar 29, 2021
Variational quantum algorithms (VQAs) that estimate values of widely used physical quantities such as the rank, quantum entropies, the Bures fidelity and the quantum Fisher information of mixed quantum states are developed. In addition, variations of...
Quantum Algorithm for Time-Dependent Hamiltonian Simulation by Permutation Expansion
Yi-Hsiang Chen, A. Kalev, I. Hen·Mar 29, 2021
We present a quantum algorithm for the dynamical simulation of time-dependent Hamiltonians. Our method involves expanding the interaction-picture Hamiltonian as a sum of generalized permutations, which leads to an integral-free Dyson series of the ti...
Gutzwiller wave function on a digital quantum computer
Bruno Murta, J. Fern'andez-Rossier·Mar 29, 2021
The determination of the ground state of quantum many-body systems via digital quantum computers rests upon the initialization of a sufficiently educated guess. This requirement becomes more stringent the greater the system. Preparing physically-moti...
Embedding Overhead Scaling of Optimization Problems in Quantum Annealing
M. Könz, W. Lechner, H. Katzgraber +1 more·Mar 29, 2021
In order to treat all-to-all connected quadratic binary optimization problems (QUBO) with hardware quantum annealers, an embedding of the original problem is required due to the sparsity of the hardware's topology. Embedding fully-connected graphs - ...
Superconducting circuit architecture for digital-analog quantum computing
Jing Yu, J. C. Retamal, M. Sanz +2 more·Mar 29, 2021
We propose a superconducting circuit architecture suitable for digital-analog quantum computing (DAQC) based on an enhanced NISQ family of nearest-neighbor interactions. DAQC makes a smart use of digital steps (single qubit rotations) and analog bloc...
Fisher Information in Noisy Intermediate-Scale Quantum Applications
Johannes Jakob Meyer·Mar 28, 2021
The recent advent of noisy intermediate-scale quantum devices, especially near-term quantum computers, has sparked extensive research efforts concerned with their possible applications. At the forefront of the considered approaches are variational me...
Encoding strongly-correlated many-boson wavefunctions on a photonic quantum computer: application to the attractive Bose-Hubbard model
Saad Yalouz, Bruno Senjean, F. Miatto +1 more·Mar 28, 2021
Variational quantum algorithms (VQA) are considered as some of the most promising methods to determine the properties of complex strongly correlated quantum many-body systems, especially from the perspective of devices available in the near term. In ...
Quantum agents in the Gym: a variational quantum algorithm for deep Q-learning
Andrea Skolik, S. Jerbi, V. Dunjko·Mar 28, 2021
Quantum machine learning (QML) has been identified as one of the key fields that could reap advantages from near-term quantum devices, next to optimization and quantum chemistry. Research in this area has focused primarily on variational quantum algori...
Distributing Multipartite Entanglement over Noisy Quantum Networks
Lu'is Bugalho, B. Coutinho, F. A. Monteiro +1 more·Mar 26, 2021
A quantum internet aims at harnessing networked quantum technologies, namely by distributing bipartite entanglement between distant nodes. However, multipartite entanglement between the nodes may empower the quantum internet for additional or better ...
Epitaxial superconductor-semiconductor two-dimensional systems for superconducting quantum circuits
Joseph O’Connell Yuan, K. Wickramasinghe, W. Strickland +4 more·Mar 26, 2021
Qubits on solid state devices could potentially provide the rapid control necessary for developing scalable quantum information processors. Materials innovation and design breakthroughs have increased functionality and coherence of qubits substantial...
Quantum variational optimization: The role of entanglement and problem hardness
Pablo D'iez-Valle, D. Porras, J. Garc'ia-Ripoll·Mar 26, 2021
Quantum variational optimization has been posed as an alternative to solve optimization problems faster and at a larger scale than what classical methods allow. In this paper we study systematically the role of entanglement, the structure of the vari...
QECOOL: On-Line Quantum Error Correction with a Superconducting Decoder for Surface Code
Yosuke Ueno, Masaaki Kondo, Masamitsu Tanaka +2 more·Mar 26, 2021
Due to the low error tolerance of a qubit, detecting and correcting errors on it is essential for fault-tolerant quantum computing. Surface code (SC) associated with its decoding algorithm is one of the most promising quantum error correction (QEC) m...
Orbital transformations to reduce the 1-norm of the electronic structure Hamiltonian for quantum computing applications
Emiel Koridon, Saad Yalouz, Bruno Senjean +3 more·Mar 26, 2021
Reducing the complexity of quantum algorithms to treat quantum chemistry problems is essential to demonstrate an eventual quantum advantage of Noisy-Intermediate Scale Quantum (NISQ) devices over their classical counterpart. Significant improvements ...
Hardware Efficient Quantum Search Algorithm
Ji Liu, Huiyang Zhou·Mar 26, 2021
Quantum computing has noteworthy speedup over classical computing by taking advantage of quantum parallelism, i.e., the superposition of states. In particular, quantum search is widely used in various computationally hard problems. Grover's search al...
Heating of a Trapped Ion Induced by Dielectric Materials.
M. Teller, D. Fioretto, P. Holz +8 more·Mar 25, 2021
Electric-field noise due to surfaces disturbs the motion of nearby trapped ions, compromising the fidelity of gate operations that are the basis for quantum computing algorithms. We present a method that predicts the effect of dielectric materials on...