Papers
Live trends in quantum computing research, updated daily from arXiv.
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15,688 papers in 12 months (-39% vs prior quarter)
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Qubit Platforms
Hardware platform mentions in abstracts — Photonic leads
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...
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...
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...
RGB image classification with quantum convolutional ansatz
Yu Jing, Yang Yang, Chonghang Wu +4 more·Jul 23, 2021
With the rapid growth of qubit numbers and coherence times in quantum hardware technology, implementing shallow neural networks on the so-called Noisy Intermediate-Scale Quantum (NISQ) devices has attracted a lot of interest. Many quantum (convolutio...
A Quantum Dot Plot Generation Algorithm for Pairwise Sequence Alignment
Joseph Clapis·Jul 23, 2021
The views, opinions and/or findings contained in this report are those of The MITRE Corporation and should not be construed as an official government position, policy, or decision, unless designated by other documentation. Approved for Public Release...
The Diagonal Distance of CWS Codes
Upendra S. Kapshikar·Jul 23, 2021
Quantum degeneracy in error correction is a feature unique to quantum error correcting codes, unlike their classical counterpart. It allows a quantum error correcting code to correct errors even when they can not uniquely pinpoint the error. The diag...
Experimental demonstration of continuous quantum error correction
W. Livingston, M. Blok, E. Flurin +3 more·Jul 23, 2021
The storage and processing of quantum information are susceptible to external noise, resulting in computational errors. A powerful method to suppress these effects is quantum error correction. Typically, quantum error correction is executed in discre...
Cross-platform comparison of arbitrary quantum states
Ze-Pei Cian, D. Zhu, C. Noel +14 more·Jul 23, 2021
As we approach the era of quantum advantage, when quantum computers (QCs) can outperform any classical computer on particular tasks, there remains the difficult challenge of how to validate their performance. While algorithmic success can be easily v...
A quantum computational approach to the open-pit mining problem
Yousef Hindy, Jessica Pointing, Meltem Tolunay +3 more·Jul 23, 2021
The determination of optimal open-pit profiles is a well-studied combinatorial optimization problem, with profound technical and conceptual relevance in computational mining. The ongoing evolution of quantum computing hardware and the recent advances...
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...
Qsun: an open-source platform towards practical quantum machine learning applications
Quoc Chuong Nguyen, Le Bin Ho, Lan Nguyen Tran +1 more·Jul 22, 2021
Currently, quantum hardware is restrained by noises and qubit numbers. Thus, a quantum virtual machine (QVM) that simulates operations of a quantum computer on classical computers is a vital tool for developing and testing quantum algorithms before d...
Nonlinear transformation of complex amplitudes via quantum singular value transformation
N. Guo, K. Mitarai, K. Fujii·Jul 22, 2021
Due to the linearity of quantum operations, it is not straightforward to implement nonlinear transformations on a quantum computer, making some practical tasks like a neural network hard to achieve. In this paper, we define a task called and provide ...
Multiple Query Optimization using a Hybrid Approach of Classical and Quantum Computing
Tobias Fankhauser, M. Soler, R. M. Fuchslin +1 more·Jul 22, 2021
Quantum computing promises to solve difficult optimization problems in chemistry, physics and mathematics more efficiently than classical computers, but requires fault-tolerant quantum computers with millions of qubits. To overcome errors introduced ...
Quantum pattern recognition in photonic circuits
Rui Wang, C. Hernani-Morales, J. D. Mart'in-Guerrero +2 more·Jul 21, 2021
This paper proposes a machine learning method to characterize photonic states via a simple optical circuit and data processing of photon number distributions, such as photonic patterns. The input states consist of two coherent states used as referenc...
Superconducting Coupler with Exponentially Large On:Off Ratio
C. Leroux, A. Di Paolo, A. Blais·Jul 21, 2021
Tunable two-qubit couplers offer an avenue to mitigate errors in multiqubit superconducting quantum processors. However, most couplers operate in a narrow frequency band and target specific couplings, such as the spurious ZZ interaction. We introduce...