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Related Experiment Video

Updated: Jul 15, 2025

Large Scale Energy Efficient Sensor Network Routing Using a Quantum Processor Unit

Large Scale Energy Efficient Sensor Network Routing Using a Quantum Processor Unit

Published on: September 8, 2023

A Higher radix architecture for quantum carry-lookahead adder.

Siyi Wang¹, Anubhab Baksi², Anupam Chattopadhyay²

¹School of Computer Science and Engineering, Nanyang Technological University, Singapore, 639798, Singapore. siyi002@e.ntu.edu.sg.

Scientific Reports

|September 28, 2023

Summary

This study introduces an efficient quantum carry-lookahead adder using a higher radix structure. The novel design reduces qubit count and T-gates, outperforming existing quantum adders in key metrics.

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Area of Science:

Quantum computing
Digital circuit design

Background:

Quantum carry-lookahead adders are recognized for their low T-depth.
Existing designs offer efficiency but have room for cost reduction.

Purpose of the Study:

To propose an efficient quantum carry-lookahead adder.
To reduce the overall cost of quantum addition through a higher radix structure.

Main Methods:

The proposed adder utilizes a higher radix structure for adding two n-bit numbers.
It employs [Formula: see text] qubits and [Formula: see text] T gates, achieving a T-depth of [Formula: see text], where r is the radix.

Main Results:

The novel adder demonstrates superior performance compared to existing quantum carry-lookahead adders.
Analysis shows advantages in T-depth, T-count, and qubit count.
It is more efficient in T-count than the Draper out-of-place adder.

Conclusions:

The higher radix quantum carry-lookahead adder offers significant improvements in efficiency.
This design presents a more cost-effective solution for quantum addition circuits.