Papers
Live trends in quantum computing research, updated daily from arXiv.
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15,670 papers in 12 months (-39% vs prior quarter)
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Qubit Platforms
Hardware platform mentions in abstracts — Photonic leads
Few-qubit quantum refrigerator for cooling a multi-qubit system
Onat Arisoy, Ozgur Esat Mustecapliouglu·Nov 27, 2020
We propose to use a few-qubit system as a compact quantum refrigerator for cooling an interacting multi-qubit system. We specifically consider a central qubit coupled to N ancilla qubits in a so-called spin-star model to be used as refrigerant by mea...
Algorithmic Primitives for Quantum-Assisted Quantum Control.
G. Policharla, Sai Vinjanampathy·Nov 27, 2020
We present two primitive algorithms to evaluate overlaps and transition matrix time series, which are then used to construct several quantum-assisted quantum control algorithms. Unlike previous approaches, our method bypasses tomographically complete...
Determining the proton content with a quantum computer
Adrián Pérez-Salinas, J. Cruz-Martinez, A. Alhajri +1 more·Nov 27, 2020
We present a first attempt to design a quantum circuit for the determination of the parton content of the proton through the estimation of parton distribution functions (PDFs), in the context of high energy physics (HEP). The growing interest in quan...
Quantum computing for atomic and molecular resonances.
Teng Bian, S. Kais·Nov 27, 2020
The complex-scaling method can be used to calculate molecular resonances within the Born-Oppenheimer approximation, assuming that the electronic coordinates are dilated independently of the nuclear coordinates. With this method, one will calculate th...
Qulacs: a fast and versatile quantum circuit simulator for research purpose
Yasunari Suzuki, Yoshiaki Kawase, Yuya Masumura +17 more·Nov 27, 2020
To explore the possibilities of a near-term intermediate-scale quantum algorithm and long-term fault-tolerant quantum computing, a fast and versatile quantum circuit simulator is needed. Here, we introduce Qulacs, a fast simulator for quantum circuit...
Experimental Detection of the Correlation Rényi Entropy in the Central Spin Model.
Mohamad Niknam, L. F. Santos, D. Cory·Nov 27, 2020
We propose and experimentally measure an entropy that quantifies the volume of correlations among qubits. The experiment is carried out on a nearly isolated quantum system composed of a central spin coupled and initially uncorrelated with 15 other sp...
Quantum algorithms for matrix scaling and matrix balancing
Joran van Apeldoorn, S. Gribling, Yinan Li +3 more·Nov 25, 2020
Matrix scaling and matrix balancing are two basic linear-algebraic problems with a wide variety of applications, such as approximating the permanent, and pre-conditioning linear systems to make them more numerically stable. We study the power and lim...
Revealing incommensurability between device-independent randomness, nonlocality, and entanglement using Hardy and Hardy-type relations
S. Sasmal, Ashutosh Rai, Sayan Gangopadhyay +2 more·Nov 25, 2020
A comprehensive treatment of the quantification of randomness certified device-independently by using the Hardy and Cabello-Liang-Li (CLL) nonlocality relations is provided in the two parties-two measurements per party-two outcomes per measurement (2...
Cosine series quantum sampling method with applications in signal and image processing
Kamil Wereszczy'nski, A. Michalczuk, Damian Pkeszor +3 more·Nov 25, 2020
A novel family of Cosine series Quantum Sampling (QCoSamp) operators appropriate for quantum computing is described. The development of quantum algorithms, analogous to classical algorithms, we apply to the harmonic analysis of signals. We show quant...
Matchgate benchmarking: Scalable benchmarking of a continuous family of many-qubit gates
J. Helsen, Sepehr Nezami, M. Reagor +1 more·Nov 25, 2020
We propose a method to reliably and efficiently extract the fidelity of many-qubit quantum circuits composed of continuously parametrized two-qubit gates called matchgates. This method, which we call matchgate benchmarking, relies on advanced techniq...
Effect of barren plateaus on gradient-free optimization
A. Arrasmith, M. Cerezo, Piotr Czarnik +2 more·Nov 24, 2020
Barren plateau landscapes correspond to gradients that vanish exponentially in the number of qubits. Such landscapes have been demonstrated for variational quantum algorithms and quantum neural networks with either deep circuits or global cost functi...
Reducing the CNOT Count for Clifford+T Circuits on NISQ Architectures
Vlad Gheorghiu, Jiaxin Huang, Sarah Meng Li +2 more·Nov 24, 2020
While mapping a quantum circuit to the physical layer one has to consider the numerous constraints imposed by the underlying hardware architecture. Connectivity of the physical qubits is one such constraint that restricts two-qubit operations, such a...
Applying the Quantum Alternating Operator Ansatz to the Graph Matching Problem
Sagnik Chatterjee, Debajyoti Bera·Nov 24, 2020
The Quantum Alternating Operator Ansatz (QAOA+) framework has recently gained attention due to its ability to solve discrete optimization problems on noisy intermediate-scale quantum (NISQ) devices in a manner that is amenable to derivation of worst-...
Quantization of Blackjack: Quantum Basic Strategy and Advantage
Yushi Mura, Hiroki Wada·Nov 24, 2020
Quantum computers that process information by harnessing the remarkable power of quantum mechanics are increasingly being put to practical use. In the future, their impact will be felt in numerous fields, including in online casino games. This is o...
Particle Track Classification Using Quantum Associative Memory
L. Ice, G. Quiroz, Andrea Delgado +1 more·Nov 24, 2020
Pattern recognition algorithms are commonly employed to simplify the challenging and necessary step of track reconstruction in sub-atomic physics experiments. Aiding in the discrimination of relevant interactions, pattern recognition seeks to acceler...
A game of quantum advantage: linking verification and simulation
Daniel Stilck França, R. García-Patrón·Nov 24, 2020
We present a formalism that captures the process of proving quantum superiority to skeptics as an interactive game between two agents, supervised by a referee. Bob, is sampling from a classical distribution on a quantum device that is supposed to dem...
The Quantum Rashomon Effect: A Strengthened Frauchiger-Renner Argument
Jochen Szangolies·Nov 23, 2020
The Frauchiger-Renner argument aims to show that `quantum theory cannot consistently describe the use of itself': in many-party settings where agents are themselves subject to quantum experiments, agents may make predictions that contradict observati...
Classical Shadows with Noise
Dax Enshan Koh, Sabee Grewal·Nov 23, 2020
The classical shadows protocol, recently introduced by Huang, Kueng, and Preskill [Nat. Phys. 16, 1050 (2020)], is a quantum-classical protocol to estimate properties of an unknown quantum state. Unlike full quantum state tomography, the protocol can...
Scaling silicon-based quantum computing using CMOS technology
M. Gonzalez-Zalba, S. D. Franceschi, E. Charbon +3 more·Nov 23, 2020
As quantum processors grow in complexity, attention is moving to the scaling prospects of the entire quantum computing system, including the classical support hardware. Recent results in high-fidelity control of individual spins in silicon, combined ...
Single-mode fiber coupling with a M-SPGD algorithm for long-range quantum communications.
Kui-Xing Yang, Maimaiti Abulizi, Yuhuai Li +7 more·Nov 23, 2020
Satellite-based quantum communication is a promising approach for realizing global-scale quantum networks. For free-space quantum channel, single-mode fiber coupling is particularly important for improving the signal-to-noise ratio of daylight quantu...