Study of Single Spin Measurement with Magnetic Resonance Force Microscopy
Date Issued
2007
Date
2007
Author(s)
Lin, Wei-Yang
DOI
en-US
Abstract
The problem of measuring a single electron spin or a single nuclear spin is of great interest for a variety of purposes, from imaging the structure of a single molecule to spin-based quantum information processing. Magnetic resonance force microscopy (MRFM) has been proposed as one of the most promising techniques for direct single-spin detection. This MRFM technique combines ultra-sensitive force detection with principles of magnetic resonance. As a result, it could be regarded as a combination of the technologies of atomic force microscopy and nuclear magnetic resonance (NMR). Recently, MRFM has been demonstrated experimentally to achieve a detection sensitivity of a single electron spin. But the signal-to noise ratio is still very weak, so the required averaging time of several hours is still too long to achieve the real-time readout of the single electron spin quantum state. In this thesis, we study theoretically to detect a single spin using MFRM and discuss in particular a detection protocol called the OScillating Cantilever driven Adiabatic Reversal (OSCAR) protocol. Two different feedback schemes are investigated to achieve the OSCAR protocol, and numerical simulations are performed to verify it. We furthermore investigate to use a cantilever with a frequency equal to the Larmor frequency of a single nuclear spin to achieve the purely mechanical NMR detection of the single nuclear spin. Finally, an estimate of the signal-to-noise ratio of measuring a single electron and a single proton spin is presented and the feasibility to detect a single nuclear spin is discussed.
Subjects
磁共振力顯微鏡
原子力顯微鏡
核磁共振
磁振造影
MRFM
AFM
NMR
MRI
OSCAR
Adiabatic theorem
Type
thesis
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