Abstract

The current state of quantum computers is characterized by its limited resources and high noise levels. These are known as Noisy Intermediate Scale Quantum Computing (NISQ). Reduction of noise is addressed at the technology level, while noise mitigation strategies have been proposed through the compilation process of quantum circuits. The compilation process entails a number of steps that are computationally intensive and scale poorly as the problems grow in size and resource usage. This paper addresses the problems associated with noise by proposing a noise aware qubit routing algorithm. This algorithm attempts to improve accuracy of circuits by using SWAP gates attempt to avoid links with high error rates. This differs from existing algorithms which try to minimize the amount of SWAP gates used. In addition, multiple metrics are evaluated for Qiskit's routing algorithms. The proposed algorithm improves the accuracy against circuits compiled using Qiskit’s basic routing algorithm, and against other more sophisticated routing algorithms, depending on the application circuit. Other metrics being considered, the routing algorithm also demonstrates to have minimal computational cost when compared to other approaches. Lastly, it is shown that different circuits benefit from different routing algorithms.

Library of Congress Subject Headings

Quantum computing--Quality control; Routing (Computer network management)

Publication Date

6-2022

Document Type

Thesis

Student Type

Graduate

Degree Name

Computer Engineering (MS)

Department, Program, or Center

Computer Engineering (KGCOE)

Advisor

Sonia Lopez Alarcon

Advisor/Committee Member

Cory Merkel

Advisor/Committee Member

Ben Zwicki

Campus

RIT – Main Campus

Plan Codes

CMPE-MS

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