Studying Importance of Charge Noise and Measurement Basis for Spin Qubit in Quantum Dot

Abstract

Abstract Quantum computation has evolved from a mere word proposed by Richard Feynman in 1980 to a physical reality in 2023. Semiconductor quantum dot spin qubit can hold 106 qubits on area of 1 cm2,clearly indicating a promising candidate for a scalable quantum computer. However, the platform has not scaled up because of lack of understanding of physics of system and noise. Here Lindblad master equation is used to understand the dynamics of charge noise and qubit. The phenomena of Quantum Collapse to a basis state and its physical implications have raised many fundamental questions in last 50 years. Nevertheless, there has not been much discussion in quantum computing community about what choice of basis can be the best to measure a qubit. In this article it is shown that how measuring different spin component of a quantum state provides different coherence time. The article provides a motivation for experimentalist to look into qubit measurement with ability to measure it in arbitrary basis.