Quantum computing Archives - Page 6 of 9 - IEEE Transactions on Quantum Engineering

Timing Constraints Imposed by Classical Digital Control Systems on Photonic Implementations of Measurement-Based Quantum Computing

November 2, 2022John R. ScottOpen Access, Special Section on Classical Control SystemsComputer architecture, Control systems, Logic gates, Photonics, Quantum computing, Qubit, Timing

Most of the architectural research on photonic implementations of measurement-based quantum computing (MBQC) has focused on the quantum resources involved in the problem with the implicit assumption that these will provide the main constraints on system scaling. However, the “flying-qubit” architecture of photonic MBQC requires specific timing constraints that need to be met by the […]

Development of an Undergraduate Quantum Engineering Degree

November 2, 2022Andrew S. DzurakOpen Access, Quantum EngineeringComputers, Electrical engineering, Industries, Mathematics, Matrices, Quantum computing, Quantum mechanics

Quantum computing, communications, sensing, and simulations are radically transformative technologies, with great potential to impact industries and economies. Worldwide, national governments, industries, and universities are moving to create a new class of workforce—the Quantum Engineers. Demand for such engineers is predicted to be in the tens of thousands within a five-year timescale, far exceeding the […]

Simultaneous Estimation of Parameters and the State of an Optical Parametric Oscillator System

June 23, 2022Qi Yu; Shota Yokoyama; Daoyi Dong; David McManus; Hidehiro YonezawaOpen Access, Quantum InformationEstimation, Filtering, Filtering theory, Kalman filters, Quantum computing, Quantum state, Quantum system

In this article, we consider the filtering problem of an optical parametric oscillator (OPO). The OPO pump power may fluctuate due to environmental disturbances, resulting in uncertainty in the system modeling. Thus, both the state and the unknown parameter may need to be estimated simultaneously. We formulate this problem using a state-space representation of the […]

The Present and Future of Discrete Logarithm Problems on Noisy Quantum Computers

June 16, 2022YOSHINORI AONO; SITONG LIU; TOMOKI TANAKA; SHUMPEI UNO; RODNEY VAN METER; NAOYUKI SHINOHARA; RYO NOJIMAOpen Access, Quantum InformationComputers, Cryptography, Logic gates, Noise level, Quantum circuit, Quantum computing, Qubit

The discrete logarithm problem (DLP) is the basis for several cryptographic primitives. Since Shor’s work, it has been known that the DLP can be solved by combining a polynomial-size quantum circuit and a polynomial-time classical postprocessing algorithm. The theoretical result corresponds the situation where a quantum device working with a medium number of qubits of […]

Timing Constraints Imposed by Classical Digital Control Systems on Photonic Implementations of Measurement-Based Quantum Computing

May 19, 2022John R. Scott; Krishna C. BalramOpen Access, Quantum InformationComputer architecture, Control systems, Logic gates, Photonics, Quantum computing, Qubit, Timing

A Distributed Learning Scheme for Variational Quantum Algorithms

May 16, 2022Yuxuan Du; Yang Qian; Xingyao Wu; Dacheng TaoOpen Access, Quantum InformationOptimization, Quantum algorithm, Quantum circuit, Quantum computing, Qubit, Task analysis, Training

Variational quantum algorithms (VQAs) are prime contenders to gain computational advantages over classical algorithms using near-term quantum machines. As such, many endeavors have been made to accelerate the optimization of modern VQAs in past years. To further improve the capability of VQAs, here, we propose a quantum distributed optimization scheme (dubbed as QUDIO), whose back […]

Development of an Undergraduate Quantum Engineering Degree

March 7, 2022Andrew S. Dzurak; Julien Epps; Arne Laucht; Robert Malaney; Andrea Morello; Hendra I. Nurdin; Jarryd J. Pla; Andre Saraiva; Chih Hwan YangOpen Access, Quantum InformationComputers, Electrical engineering, Industries, Mathematics, Matrices, Quantum computing, Quantum mechanics

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 […]