IEEE Transactions on Quantum Engineering

Enhancing a Near-Term Quantum Accelerator’s Instruction Set Architecture for Materials Science Applications

January 28, 2020Xiang Zou, Shavindra P. Premaratne, M. Adriaan Rol, Sonika Johri, Viacheslav Ostroukh, David J. Michalak, Roman Caudillo, James S. Clarke, Leonardo DiCarlo, A. Y. MatsuuraOpen AccessComputational modeling, Computer architecture, Heuristic algorithms, Instruction sets, Logic gates, Qubit

Quantum computers with tens to hundreds of noisy qubits are being developed today. To be useful for real-world applications, we believe that these near-term systems cannot simply be scaled-down non-error-corrected versions of future fault-tolerant large-scale quantum computers. These near-term systems require specific architecture and design attributes to realize their full potential. To efficiently execute an […]

Decoding Quantum Error Correction Codes With Local Variation

January 20, 2020Michael Hanks, William J. Munro, Kae NemotoOpen AccessDecoding, Error analysis, Error correction codes, Lattices, Measurement errors, Measurement uncertainty, Qubit

In this article, we investigate the role of local information in the decoding of the repetition and surface error correction codes for the protection of quantum states. Our key result is an improvement in resource efficiency when local information is taken into account during the decoding process: the code distance associated with a given logical […]

Fault-Tolerant Resource Estimation of Quantum Random-Access Memories

January 17, 2020Olivia Di Matteo; Vlad Gheorghiu; Michele MoscaOpen AccessFault tolerance, Fault tolerant systems, Indexes, Logic gates, Qubit

Quantum random-access lookup of a string of classical bits is a necessary ingredient in several important quantum algorithms. In some cases, the cost of such quantum random-access memory (qRAM) is the limiting factor in the implementation of the algorithm. In this article, we study the cost of fault-tolerantly implementing a qRAM. We construct and analyze […]

Reducing the Cost of Implementing the Advanced Encryption Standard as a Quantum Circuit

January 16, 2020Brandon Langenberg; Hai Pham; Rainer SteinwandtOpen Access, Quantum SoftwareEncryption, Logic gates, NIST, Qubit, Wires

To quantify security levels in a postquantum scenario, it is common to use the quantum resources needed to attack the Advanced Encryption Standard (AES) as a reference value. Specifically, in the National Institute of Standards and Technology’s ongoing postquantum standardization effort, different security categories are defined that reflect the quantum resources needed to attack AES-128, […]