Logic gates Archives - Page 6 of 7 - IEEE Transactions on Quantum Engineering

Survey on Quantum Circuit Compilation for Noisy Intermediate-Scale Quantum Computers: Artificial Intelligence to Heuristics

March 23, 2021Janusz Kusyk; Samah M. Saeed; Muharrem Umit UyarOpen Access, Quantum SoftwareArtificial intelligence, Computer architecture, Computers, Hardware, Logic gates, Quantum circuit, Qubit

Computationally expensive applications, including machine learning, chemical simulations, and financial modeling, are promising candidates for noisy intermediate scale quantum (NISQ) computers. In these problems, one important challenge is mapping a quantum circuit onto NISQ hardware while satisfying physical constraints of an underlying quantum architecture. Quantum circuit compilation (QCC) aims to generate feasible mappings such that […]

Variational Learning for Quantum Artificial Neural Networks

February 26, 2021Francesco Tacchino; Stefano Mangini; Panagiotis Kl. Barkoutsos; Chiara Macchiavello; Dario Gerace; Ivano Tavernelli; Daniele BajoniOpen Access, Quantum InformationBiological neural networks, Encoding, Logic gates, Machine learning, Neurons, Quantum computing, Qubit

In the past few years, quantum computing and machine learning fostered rapid developments in their respective areas of application, introducing new perspectives on how information processing systems can be realized and programmed. The rapidly growing field of quantum machine learning aims at bringing together these two ongoing revolutions. Here, we first review a series of […]

Distributed Quantum Computing and Network Control for Accelerated VQE

February 9, 2021Stephen DiAdamo; Marco Ghibaudi; James CruiseOpen Access, Quantum Computer Architecture, Quantum InformationComputers, Control systems, Hardware, Logic gates, Quantum algorithm, Quantum computing, Qubit

Interconnecting small quantum computers will be essential in the future for creating large-scale, robust quantum computers. Methods for distributing monolithic quantum algorithms efficiently are, thus, needed. In this article, we consider an approach for distributing the accelerated variational quantum eigensolver algorithm over arbitrary sized—in terms of number of qubits—distributed quantum computers. We consider approaches for […]

Compiler Design for Distributed Quantum Computing

January 22, 2021Davide Ferrari; Angela Sara Cacciapuoti; Michele Amoretti; Marcello CaleffiOpen Access, Quantum Computer Architecture, Quantum InformationComputer architecture, Integrated circuit modeling, Logic gates, Quantum circuit, Quantum computing, Qubit, Task analysis

In distributed quantum computing architectures, with the network and communications functionalities provided by the Quantum Internet, remote quantum processing units can communicate and cooperate for executing computational tasks that single, noisy, intermediate-scale quantum devices cannot handle by themselves. To this aim, distributed quantum computing requires a new generation of quantum compilers, for mapping any quantum […]

Benchmarking Hamiltonian Noise in the D-Wave Quantum Annealer

January 11, 2021Tristan Zaborniak; Rogério de SousaOpen Access, Quantum InformationAnnealing, Benchmark testing, Correlation, Logic gates, Qubit, Stationary state, Time measurement

Various sources of noise limit the performance of quantum computers by altering qubit states in an uncontrolled manner throughout computations and reducing their coherence time. In quantum annealers, this noise introduces additional fluctuations to the parameters defining the original problem Hamiltonian, such that they find the ground states of problems perturbed from those originally programmed. […]

Finding Small and Large k-Clique Instances on a Quantum Computer

December 18, 2020Sara Ayman Metwalli; François Le Gall; Rodney Van MeterOpen Access, Quantum Computer Architecture, Quantum InformationComputers, Hamming weight, Hilbert space, Logic gates, Quantum computing, Qubit, Time complexity

Algorithms for triangle finding, the smallest nontrivial instance of the k -clique problem, have been proposed for quantum computers. Still, those algorithms assume the use of fixed access time quantum RAM. In this article, we present a practical gate-based approach to both the triangle-finding problem and its NP-hard k -clique generalization. We examine both constant factors for near-term implementation […]

High-Fidelity Control of Superconducting Qubits Using Direct Microwave Synthesis in Higher Nyquist Zones

December 8, 2020William D. Kalfus; Diana F. Lee; Guilhem J. Ribeill; Spencer D. Fallek; Andrew Wagner; Brian DonoOpen AccessBandwidth, Hardware, Instruments, Logic gates, Qubit, Radio frequency, Superconducting microwave devices

Control electronics for superconducting quantum processors have strict requirements for accurate command of the sensitive quantum states of their qubits. Hinging on the purity of ultra-phase-stable oscillators to upconvert very-low-noise baseband pulses, conventional control systems can become prohibitively complex and expensive when scaling to larger quantum devices, especially as high sampling rates become desirable for […]

Preparing Dicke States on a Quantum Computer

December 1, 2020Chandra Sekhar Mukherjee; Subhamoy Maitra; Vineet Gaurav; Dibyendu RoyOpen Access, Quantum Computer Architecture, Quantum InformationComputer architecture, Logic gates, Matrix decomposition, Noise measurement, Qubit, Task analysis, Tutorials

Exact requirement of controlled NOT (CNOT) and single-qubit gates to implement a quantum algorithm in a given architecture is one of the central problems in this computational paradigm. In this article, we take a tutorial approach in explaining the preparation of Dicke states (|D k n 〉) using concise realizations of partially defined unitary transformations. We show how […]

Quantum Approximate Optimization With Parallelizable Gates

October 29, 2020Wolfgang LechnerOpen Access, Quantum Computer Architecture, Quantum InformationLattices, Logic gates, Optimization, Protocols, Qubit, Stationary state

The quantum approximate optimization algorithm (QAOA) has been introduced as a heuristic digital quantum computing scheme to find approximate solutions of combinatorial optimization problems. We present a scheme to parallelize this approach for arbitrary all-to-all connected problem graphs in a layout of quantum bits (qubits) with nearest-neighbor interactions. The protocol consists of single qubit operations […]

Voltage-Tunable Superconducting Resonators: A Platform for Random Access Quantum Memory

October 28, 2020Kasra Sardashti; Matthieu C. Dartiailh; Joseph Yuan; Sean Hart; Pat Gumann; Javad ShabaniOpen Access, Quantum InformationCouplings, Inductance, Logic gates, Qubit, Resonant frequency, Resonators, Superconducting microwave devices

In computing architectures, one important factor is the tradeoff between the need to couple bits of information (quantum or classical) to each other and to an external drive and the need to isolate them well enough in order to protect the information for an extended period of time. In the case of superconducting quantum circuits, […]