International Conference on Computer and Knowledge Engineering

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Minimizing Quantum Overhead: A Fault-Tolerant ALU Design with Reduced T Metrics

Authors :

Sarallah Keshavarz¹ Shekoofeh Moghimi² Mohammad Reza Reshadinezhad³

1- Computer Engineering Department, University of Isfahan, Iran 2- Computer Engineering Department, University of Isfahan, Iran 3- Faculty Member of Computer Engineering Department, University of Isfahan, Iran

Keywords :

Quantum ALU،Fault Tolerant،Clifford+ T Group Gates،T-depth،T-count

Abstract :

Quantum Arithmetic Logic Units (ALUs) serve as critical components in quantum processors, enabling both arithmetic and logical operations on qubits. However, the fragile nature of quantum systems makes them susceptible to errors and decoherence, necessitating fault-tolerant designs. In this work, we propose a fault-tolerant quantum ALU architecture constructed using the Clifford+ T gate set, which is widely recognized for its compatibility with error-correcting codes. The proposed design minimizes quantum resource overhead while maintaining computational accuracy under fault-prone conditions. Notably, the architecture requires zero ancilla and generates a single garbage output, optimizing the qubit space. Performance evaluations demonstrate significant improvements, achieving a 31.8% reduction in T-count and a 33.3% reduction in T-depth compared to existing designs. These enhancements contribute to more efficient and reliable quantum computation, paving the way for scalable quantum processor development.