Quantum computing Archives - Page 4 of 6 - IEEE Transactions on Quantum Engineering

New Single-Preparation Methods for Unsupervised Quantum Machine Learning Problems

October 21, 2021Yannick Deville; Alain DevilleOpen Access, Quantum InformationBlind source separation, Machine learning, Parameter estimation, Quantum computing, Quantum state, Random variables, Tomography

The term “machine learning” especially refers to algorithms that derive mappings, i.e., input–output transforms, by using numerical data that provide information about considered transforms. These transforms appear in many problems related to classification/clustering, regression, system identification, system inversion, and input signal restoration/separation. We here analyze the connections between all these problems in the classical and […]

Finding Solutions to the Integer Case Constraint Satisfiability Problem Using Grover’s Algorithm

October 15, 2021Gayathree M. Vinod; Anil ShajiOpen Access, Quantum InformationProgram processors, Quantum computing, Qubit, Registers, Search problems

Constraint satisfiability problems, crucial to several applications, are solved on a quantum computer using Grover’s search algorithm, leading to a quadratic improvement over the classical case. The solutions are obtained with high probability for several cases and are illustrated for the cases involving two variables for both 3- and 4-bit numbers. Methods are defined for […]

QubiC: An Open-Source FPGA-Based Control and Measurement System for Superconducting Quantum Information Processors

September 29, 2021Yilun Xu; Gang Huang; Jan Balewski; Ravi Naik; Alexis Morvan; Bradley Mitchell; Kasra Nowrouzi; David I. Santiago; Irfan SiddiqiOpen Access, Quantum Computer Architecture, Quantum InformationField programmable gate arrays, Hardware, Prototypes, Quantum computing, Qubit

As quantum information processors grow in quantum bit (qubit) count and functionality, the control and measurement system becomes a limiting factor to large-scale extensibility. To tackle this challenge and keep pace with rapidly evolving classical control requirements, full control stack access is essential to system-level optimization. We design a modular field-programmable gate array (FPGA)-based system […]

Quantum Generative Models for Small Molecule Drug Discovery

August 23, 2021Junde Li; Rasit O. Topaloglu; Swaroop GhoshOpen Access, Quantum InformationChemicals, Drugs, Generative adversarial networks, Logic gates, Quantum computing, Qubit, Training

Existing drug discovery pipelines take 5–10 years and cost billions of dollars. Computational approaches aim to sample from regions of the whole molecular and solid-state compounds called chemical space, which could be on the order of 1060. Deep generative models can model the underlying probability distribution of both the physical structures and property of drugs and […]

Efficient Discrete Feature Encoding for Variational Quantum Classifier

August 10, 2021Hiroshi Yano; Yudai Suzuki; Kohei M. Itoh; Rudy Raymond; Naoki YamamotoOpen Access, Quantum InformationEncoding, Machine learning, Quantum computing, Quantum mechanics, Quantum state, Qubit, Task analysis

Recent days have witnessed significant interests in applying quantum-enhanced techniques for solving a variety of machine learning tasks. Variational methods that use quantum resources of imperfect quantum devices with the help of classical computing techniques are popular for supervised learning. Variational quantum classification (VQC) is one of such methods with possible quantum advantage in using […]

Engineering the Quantum Scientific Computing Open User Testbed

July 13, 2021Susan M. Clark; Daniel Lobser; Melissa C. Revelle; Christopher G. Yale; David Bossert; Ashlyn D. Burch; Matthew N. Chow; Craig W. Hogle; Megan Ivory; Jessica Pehr; Bradley Salzbrenner; Daniel Stick; William Sweatt; Joshua M. Wilson; Edward WinrowOpen Access, Quantum InformationIons, Laboratories, Logic gates, Optical pulses, Quantum computing, Qubit, Steel

The Quantum Scientific Computing Open User Testbed (QSCOUT) at Sandia National Laboratories is a trapped-ion qubit system designed to evaluate the potential of near-term quantum hardware in scientific computing applications for the U.S. Department of Energy and its Advanced Scientific Computing Research program. Similar to commercially available platforms, it offers quantum hardware that researchers can […]

Reducing the Depth of Linear Reversible Quantum Circuits

July 7, 2021Timothée Goubault de Brugière; Marc Baboulin; Benoît Valiron; Simon Martiel; Cyril AlloucheOpen Access, Quantum Computer Architecture, Quantum InformationApproximation algorithms, Hardware, Logic gates, Quantum circuit, Quantum computing, Qubit, Upper bound

In quantum computing the decoherence time of the qubits determines the computation time available, and this time is very limited when using current hardware. In this article, we minimize the execution time (the depth) for a class of circuits referred to as linear reversible circuits, which has many applications in quantum computing (e.g., stabilizer circuits, […]

Single-Qubit Fidelity Assessment of Quantum Annealing Hardware

June 25, 2021Jon Nelson; Marc Vuffray; Andrey Y. Lokhov; Carleton CoffrinOpen Access, Quantum Computer Architecture, Quantum InformationAnnealing, Hardware, Performance evaluation, Protocols, Quantum computing, Qubit, Standards

As a wide variety of quantum computing platforms become available, methods for assessing and comparing the performance of these devices are of increasing interest and importance. Inspired by the success of single-qubit error rate computations for tracking the progress of gate-based quantum computers, this work proposes a quantum annealing single-qubit assessment (QASA) protocol for quantifying […]

Benchmarking Quantum Coprocessors in an Application-Centric, Hardware-Agnostic, and Scalable Way

June 17, 2021Simon Martiel; Thomas Ayral; Cyril AlloucheOpen Access, Quantum Computer Architecture, Quantum InformationBenchmark testing, Hardware, Logic gates, Measurement, Protocols, Quantum computing, Qubit

Existing protocols for benchmarking current quantum coprocessors fail to meet the usual standards for assessing the performance of high-performance-computing platforms. After a synthetic review of these protocols—whether at the gate, circuit, or application level—we introduce a new benchmark, dubbed Atos Q-score, which is application-centric, hardware-agnostic, and scalable to quantum advantage processor sizes and beyond. The […]

One-Dimensional Lazy Quantum Walk in Ternary System

April 21, 2021Amit Saha; Sudhindu Bikash Mandal; Debasri Saha; Amlan ChakrabartiOpen Access, Quantum Computer Architecture, Quantum InformationComputers, Hilbert space, Logic gates, Probability distribution, Quantum circuit, Quantum computing, Quantum system

Quantum walks play an important role for developing quantum algorithms and quantum simulations. Here, we introduce a first of its kind one-dimensional lazy quantum walk in the ternary quantum domain and show its equivalence for circuit realization in ternary quantum logic. Using an appropriate logical mapping of the position space on which a walker evolves […]