Papers
Live trends in quantum computing research, updated daily from arXiv.
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Qubit Platforms
Hardware platform mentions in abstracts — Photonic leads
Improved quantum error correction using soft information
C. Pattison, M. Beverland, M. Silva +1 more·Jul 28, 2021
The typical model for measurement noise in quantum error correction is to randomly flip the binary measurement outcome. In experiments, measurements yield much richer information - e.g., continuous current values, discrete photon counts - which is th...
Quantum Artificial Intelligence for the Science of Climate Change
Manmeet Singh, C. Dhara, Adarsh Kumar +2 more·Jul 28, 2021
Climate change has become one of the biggest global problems increasingly compromising the Earth's habitability. Recent developments such as the extraordinary heat waves in California&Canada, and the devastating floods in Germany point to the role of...
Quantum annealing algorithms for Boolean tensor networks
Elijah Pelofske, Georg Hahn, D. O’Malley +2 more·Jul 28, 2021
Quantum annealers manufactured by D-Wave Systems, Inc., are computational devices capable of finding high-quality heuristic solutions of NP-hard problems. In this contribution, we explore the potential and effectiveness of such quantum annealers for ...
Sensing dot with high output swing for scalable baseband readout of spin qubits
E. Kammerloher, A. Schmidbauer, L. Diebel +9 more·Jul 28, 2021
A crucial requirement for quantum computing, in particular for scalable quantum computing and error correction, is a fast and high-fidelity qubit readout. For semiconductor based qubits, one limiting factor for local low-power signal amplification, i...
Freedom of the mixer rotation axis improves performance in the quantum approximate optimization algorithm
L. Govia, C. Poole, M. Saffman +1 more·Jul 28, 2021
Variational quantum algorithms such as the quantum approximate optimization algorithm (QAOA) are particularly attractive candidates for implementation on near-term quantum processors. As hardware realities such as error and qubit connectivity will co...
Trade off-free entanglement stabilization in a superconducting qutrit-qubit system
Tristan Brown, Emery Doucet, D. Ristè +7 more·Jul 28, 2021
Quantum reservoir engineering is a powerful framework for autonomous quantum state preparation and error correction. However, traditional approaches to reservoir engineering are hindered by unavoidable coherent leakage out of the target state, which ...
Feature Selection for Recommender Systems with Quantum Computing
Riccardo Nembrini, Maurizio Ferrari Dacrema, P. Cremonesi·Jul 28, 2021
The promise of quantum computing to open new unexplored possibilities in several scientific fields has been long discussed, but until recently the lack of a functional quantum computer has confined this discussion mostly to theoretical algorithmic pa...
Quantum computing for classical problems: variational quantum eigensolver for activated processes
Pierpaolo Pravatto, D. Castaldo, Federico Gallina +3 more·Jul 27, 2021
The theory of stochastic processes impacts both physical and social sciences. At the molecular scale, stochastic dynamics is ubiquitous because of thermal fluctuations. The Fokker–Plank–Smoluchowski equation models the time evolution of the probabili...
Cross-architecture tuning of silicon and SiGe-based quantum devices using machine learning
B. Severin, D. Lennon, L. Camenzind +20 more·Jul 27, 2021
The potential of Si and SiGe-based devices for the scaling of quantum circuits is tainted by device variability. Each device needs to be tuned to operation conditions and each device realisation requires a different tuning protocol. We demonstrate th...
Mitigating noise in digital and digital–analog quantum computation
Paula Garc'ia-Molina, Ana Martin, Mikel Garcia de Andoin +1 more·Jul 27, 2021
Noisy Intermediate-Scale Quantum (NISQ) devices lack error correction, limiting scalability for quantum algorithms. In this context, digital-analog quantum computing (DAQC) offers a more resilient alternative quantum computing paradigm that outperfor...
Strong Coupling Optomechanics Mediated by a Qubit in the Dispersive Regime
Ahmad Shafiei Aporvari, D. Vitali·Jul 27, 2021
Cavity optomechanics represents a flexible platform for the implementation of quantum technologies, useful in particular for the realization of quantum interfaces, quantum sensors and quantum information processing. However, the dispersive, radiation...
Clustering and enhanced classification using a hybrid quantum autoencoder
Maiyuren Srikumar, C. Hill, L. Hollenberg·Jul 26, 2021
Quantum machine learning (QML) is a rapidly growing area of research at the intersection of classical machine learning and quantum information theory. One area of considerable interest is the use of QML to learn information contained within quantum s...
General parameter-shift rules for quantum gradients
David Wierichs, J. Izaac, C. Wang +1 more·Jul 26, 2021
Variational quantum algorithms are ubiquitous in applications of noisy intermediate-scale quantum computers. Due to the structure of conventional parametrized quantum gates, the evaluated functions typically are finite Fourier series of the input par...
Quantum gates with weak van der Waals interactions of neutral Rydberg atoms
Xiao-Feng Shi, Yan Lu·Jul 26, 2021
Neutral atoms are promising for large-scale quantum computing, but accurate neutral-atom entanglement depends on large Rydberg interactions which strongly limit the interatomic distances. Via a phase accumulation in detuned Rabi cycles enabled by a R...
Endless fun in high dimensions—A quantum card game
Lea Kopf, M. Hiekkamäki, S. Prabhakar +1 more·Jul 26, 2021
Quantum technologies enable new ways to distribute and process information. The enormous progress over the recent decades has led to an urgent need for new educational programs to train professionals to work in this field. Here, we present a card gam...
Tight Bounds for the Randomized and Quantum Communication Complexities of Equality with Small Error
Nikhil S. Mande, R. D. Wolf·Jul 25, 2021
We investigate the randomized and quantum communication complexities of the well-studied Equality function with small error probability $\epsilon$, getting optimal constant factors in the leading terms in a number of different models. In the randomiz...
Digital quantum simulation of dynamical topological invariants on near-term quantum computers
Huai-Chun Chang, H. Hsu·Jul 25, 2021
Programmable quantum processors are suitable platforms for simulating quantum systems, of which topological phases are of particular interest. We simulate the quench dynamics of a one-dimensional system on IBM Q devices. The topological properties of...
Reasoning about Recursive Quantum Programs
Zhaowei Xu, M. Ying, Benoît Valiron·Jul 24, 2021
Most modern (classical) programming languages support recursion. Recursion has also been successfully applied to the design of several quantum algorithms and introduced in a couple of quantum programming languages. So, it can be expected that recursi...
Lifetime of the $^2F_{7/2}$ level in Yb$^+$ for spontaneous emission of electric octupole radiation
R. Lange, A. A. Peshkov, N. Huntemann +3 more·Jul 23, 2021
We report a measurement of the radiative lifetime of the $^2F_{7/2}$ level of $^{171}$Yb$^+$ that is coupled to the $^2S_{1/2}$ ground state via an electric octupole transition.The radiative lifetime is determined to be $9.96(50)\times 10^7$~s, corre...
A survey on NIST PQ signatures
Nicola Di Chiano, Riccardo Longo, Alessio Meneghetti +1 more·Jul 23, 2021
Shor's shockingly fast quantum algorithm for solving the period-finding problem is a threat for the most common public-key primitives, as it can be efficiently applied to solve both the Integer Factorisation Problem and the Discrete Logarithm Problem...