Case Study of Decoherence Times of Transmon Qubit

TL;DR

This paper investigates the decoherence times of transmon qubits, analyzing how noise sources affect their coherence, which is crucial for advancing superconducting quantum computers.

Contribution

It provides a numerical analysis of decoherence times in transmon qubits considering noise, flux, and critical current variations, offering insights into their coherence properties.

Findings

Decoherence times vary significantly with noise sources.

Numerical methods effectively estimate decoherence times.

Results highlight key factors influencing qubit coherence.

Abstract

In the past two decades, one of the fascinating subjects in quantum physics has been quantum bits (qubits). Thanks to the superposition principle, the qubits can perform many calculations simultaneously, which will significantly increase the speed and capacity of the calculations. The time when a qubit lives in an excited state is called decoherence time. The decoherence time varies considerably depending on the qubit type and materials. Today, short decoherence times are one of the bottlenecks in implementing quantum computers based on superconducting qubits. In this research, the topology of the transmon qubit is investigated, and the decoherence time caused by noise, flux, and critical current noise is calculated by numerical method.