Authors:

Gabriel Goodwin

Date Created:

Not specified

Course Title:

Professor:

Not specified

About Paper:

Quantum Spin Liquids (QSLs), which have variable spin ordering resulting from geometric frustration, are a promising candidate for topological quantum computing, as they give rise to exotic quantum effects such as fractionalization and zero-point motion. The topological frustration of QSLs introduces inherent spin fluctuations even at absolute zero, and at higher temperatures acts with Johnson-Nyquist thermal noise to further decohere spin order. Understanding the fluctuations in spin order as thermal noise is present in QSLs will thus be extremely beneficial to the development of topological quantum computing technologies. To measure the spin order and thermal noise signature of QSLs subject to various temperatures and magnetic field strengths, we used an Oxford Instruments Proteox Dilution Refrigerator modified with a DC Superconducting Quantum Interference Device (SQUID) Magnetometer. When a magnetic field of up to 14 T is applied to a sample material, the responding magnetic flux through a pickup loop inducts with the SQUID Magnetometer producing a voltage reading whose noise signature reveals the nature and strength of thermal noise which decoheres spin alignment. Varying the temperature at which these measurements occur from several Kelvin to several millikelvin reveal how this noise signature changes as a function of temperature, which quantifies inherent quantum noise in the material.

Source:

Purdue University / 2023

Topics:

No topics listed

Co-authors:

Gabriel Goodwin