Papers
Live trends in quantum computing research, updated daily from arXiv.
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Qubit Platforms
Hardware platform mentions in abstracts — Photonic leads
Scalable and programmable phononic network with trapped ions
Wentao Chen, Yao Lu, Shuaining Zhang +9 more·Jul 13, 2022
A network of bosons evolving among different modes while passing through beam splitters and phase shifters has been applied to demonstrate quantum computational advantage. While such networks have mostly been implemented in optical systems using phot...
Conservation Laws and Quantum Error Correction: Toward a Generalized Matching Decoder
Benjamin J. Brown·Jul 13, 2022
Decoding algorithms are essential to fault-tolerant quantum-computing architectures. In this perspective we explore decoding algorithms for the surface code; a prototypical quantum low-density parity-check code that underlies many of the leading effo...
Quantum speed limits on operator flows and correlation functions
Nicoletta Carabba, Niklas Hörnedal, A. Campo·Jul 12, 2022
Quantum speed limits (QSLs) identify fundamental time scales of physical processes by providing lower bounds on the rate of change of a quantum state or the expectation value of an observable. We introduce a generalization of QSL for unitary operator...
Efficient factored gradient descent algorithm for quantum state tomography
Yong Wang, Lijun Liu, Shuming Cheng +2 more·Jul 12, 2022
Reconstructing the state of quantum many-body systems is of fundamental importance in quantum information tasks, but extremely challenging due to the curse of dimensionality. In this work, we present an efficient quantum tomography protocol that comb...
An adiabatic oracle for Grover's algorithm
B. Yan, N. Sinitsyn·Jul 12, 2022
Grover’s search algorithm was originally proposed for circuit-based quantum computers. A crucial part of it is to query an oracle — a black-box unitary operation. Generation of this oracle is formally beyond the original algorithm design. Here, we pr...
A Synergistic Compilation Workflow for Tackling Crosstalk in Quantum Machines
Fei Hua, Yuwei Jin, A. Li +5 more·Jul 12, 2022
Near-term quantum systems tend to be noisy. Crosstalk noise has been recognized as one of several major types of noises in superconducting Noisy Intermediate-Scale Quantum (NISQ) devices. Crosstalk arises from the concurrent execution of two-qubit ga...
Quantum Algorithm based on Quantum Fourier Transform for Register-by-Constant Addition
F. C. Ferraz·Jul 12, 2022
Since Shor's proposition of the method for factoring products of prime numbers using quantum computing, there has been a quest to implement efficient quantum arithmetic algorithms. These algorithms are capable of applying arithmetic operations simult...
Quantum extensive-form games
Kazuki Ikeda·Jul 12, 2022
We propose a concept of quantum extensive-form games, which is a quantum extension of classical extensive-form games. Extensive-form games is a general concept of games such as Go, Shogi, and chess, which have triggered the recent AI revolution, and ...
Resource analysis for quantum-aided Byzantine agreement with the four-qubit singlet state
Z. Guba, István Finta, Ákos Budai +3 more·Jul 11, 2022
In distributed computing, a Byzantine fault is a condition where a component behaves inconsistently, showing different symptoms to different components of the system. Consensus among the correct components can be reached by appropriately crafted comm...
Belief Propagation with Quantum Messages for Symmetric Classical-Quantum Channels
S. Brandsen, Avijit Mandal, H. Pfister·Jul 11, 2022
Belief propagation (BP) is a classical algorithm that approximates the marginal distribution associated with a factor graph by passing messages between adjacent nodes in the graph. It gained popularity in the 1990’s as a powerful decoding algorithm f...
Information flow in parameterized quantum circuits
Abhinav Anand, Lasse Bjørn Kristensen, Felix Frohnert +2 more·Jul 11, 2022
In this work, we introduce a new way to quantify information flow in quantum systems, especially for parameterized quantum circuits (PQCs). We use a graph representation of the circuits and propose a new distance metric using the mutual information b...
A randomized benchmarking suite for mid-circuit measurements
L. Govia, P. Jurcevic, C. J. Wood +3 more·Jul 11, 2022
Mid-circuit measurements are a key component in many quantum information computing protocols, including quantum error correction, fault-tolerant logical operations, and measurement based quantum computing. As such, techniques to quickly and efficient...
Multi-Objective Evolutionary Architecture Search for Parameterized Quantum Circuits
Lidong Ding, L. Spector·Jul 9, 2022
Recent advancements in quantum computing have shown promising computational advantages in many problem areas. As one of those areas with increasing attention, hybrid quantum-classical machine learning systems have demonstrated the capability to solve...
Discrete-time quantum walks in qudit systems
A. Saha, Debasri Saha, Amlan Chakrabarti·Jul 9, 2022
Quantum walks contribute significantly to developing quantum algorithms and quantum simulations. Here, we introduce a first of its kind one-dimensional quantum walk in the d-dimensional quantum domain, where d>2\documentclass[12pt]{minimal} \usepacka...
Quantum neuron selection: finding high performing subnetworks with quantum algorithms
T. Whitaker·Jul 9, 2022
Gradient descent methods have long been the de facto standard for training deep neural networks. Millions of training samples are fed into models with billions of parameters, which are slowly updated over hundreds of epochs. Recently, it's been shown...
Computing electronic correlation energies using linear depth quantum circuits
Chong Hian Chee, A. Mak, D. Leykam +2 more·Jul 8, 2022
Efficient computation of molecular energies is an exciting application of quantum computing for quantum chemistry, but current noisy intermediate-scale quantum (NISQ) devices can only execute shallow circuits, limiting existing variational quantum al...
Hybrid quantum-classical algorithms in the noisy intermediate-scale quantum era and beyond
A. Callison, N. Chancellor·Jul 8, 2022
Hybrid quantum-classical algorithms are central to much of the current research in quantum computing, particularly when considering the noisy intermediate-scale quantum (NISQ) era, with a number of experimental demonstrations having already been perf...
The Quantum Approximate Optimization Algorithm performance with low entanglement and high circuit depth
Rishi Sreedhar, Pontus Vikstaal, Marika Svensson +3 more·Jul 7, 2022
Variational quantum algorithms constitute one of the most widespread methods for using current noisy quantum computers. However, it is unknown if these heuristic algorithms provide any quantum-computational speedup, although we cannot simulate them c...
Quantum Computing for Rotating, Charged and String Theory Black Holes
V. Chandra, M. McGuigan·Jul 7, 2022
The quantum mechanics of Rotating, Charged, de Sitter and String Theory black holes are of recent interest because of their peculiar thermodynamic properties, as well the mysterious nature of their microstates. A full quantum treatment of the operato...
Parameterized Colorings And Labellings Of Graphs In Topological Coding
Bing Yao, Xiaohui Zhang, Hui Sun +3 more·Jul 7, 2022
The coming quantum computation is forcing us to reexamine the cryptosystems people use. We are applying graph colorings of topological coding to modern information security and future cryptography against supercomputer and quantum computer attacks in...