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Site Directed Spin Labeling and EPR Spectroscopic Studies of Pentameric Ligand-Gated Ion Channels

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Published on: July 4, 2016

Electron spin dephasing due to hyperfine interactions with a nuclear spin bath.

Lukasz Cywiński¹, Wayne M Witzel, S Das Sarma

¹Condensed Matter Theory Center, Department of Physics, University of Maryland, College Park, Maryland 20742-4111, USA.

Physical Review Letters

|March 5, 2009

Summary

This summary is machine-generated.

We present a theory for spin qubit decoherence in nuclear spin baths. Our model explains decoherence mechanisms, including spectral diffusion and hyperfine interactions, applicable down to 10 mT magnetic fields.

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Area of Science:

Quantum computing
Solid-state physics

Background:

Spin qubits are promising for quantum computation.
Decoherence limits qubit performance.
Nuclear spin baths induce decoherence through various mechanisms.

Purpose of the Study:

Investigate pure dephasing decoherence of spin qubits.
Analyze decoherence in the presence of a nuclear spin bath.
Develop a theory for hyperfine-mediated decoherence.

Main Methods:

Studied free induction decay and spin echo.
Developed a theory for decoherence due to hyperfine interactions.
Analyzed long-range nature of nuclear spin interactions.

Main Results:

Identified spectral diffusion as the primary decoherence mechanism at high magnetic fields.
Showed hyperfine-mediated interactions become significant at lower magnetic fields.
Validated the theory's applicability down to approximately 10 mT for thermal uncorrelated baths.

Conclusions:

The developed theory accurately describes spin qubit decoherence.
Hyperfine interactions play a crucial role in decoherence at lower magnetic fields.
The findings enable comparison with experimental results in GaAs quantum dots.