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Updated: Jul 6, 2025
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Measurement of Coherence Decay in GaMnAs Using Femtosecond Four-wave Mixing
Published on: December 3, 2013
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Magnon-mediated qubit coupling determined via dissipation measurements
Masaya Fukami1, Jonathan C Marcks1,2, Denis R Candido3
1Pritzker School of Molecular Engineering, University of Chicago, Chicago, IL 60637.
Summary
Researchers experimentally measured magnon-mediated interactions between nitrogen-vacancy (NV) centers in diamond. This provides a method to characterize hybrid quantum systems for quantum spintronics, enabling longer-range qubit connections.
Area of Science:
- Quantum Information Science
- Solid-State Physics
- Quantum Spintronics
Background:
- Hybrid quantum systems (HQSs) integrate localized and delocalized spin systems for quantum information processing.
- Nitrogen-vacancy (NV) centers in diamond and magnons in ferrimagnets are promising HQS components.
- Magnon-mediated interactions are key for long-range qubit interconnectivity but lack experimental characterization.
Purpose of the Study:
- To experimentally determine the magnon-mediated interaction between NV centers.
- To provide a method for characterizing HQSs, particularly the NV-magnon coupling.
- To inform the development of future entangled solid-state quantum systems.
Main Methods:
- Experimental determination of magnon-mediated NV-NV coupling.
- Measurement of the magnon-induced self-energy of NV centers.
- Quantitative comparison with a dipolar interaction model for NV-magnon coupling.
Main Results:
- Successfully determined the magnon-mediated NV-NV coupling strength experimentally.
- Results align quantitatively with theoretical predictions based on dipolar interactions.
- Demonstrated a method to characterize HQSs without requiring strong coupling regimes.
Conclusions:
- Experimental characterization of magnon-mediated NV-NV coupling is now feasible.
- Dipolar interactions are confirmed as the mechanism for NV-magnon coupling.
- This work offers a valuable tool for advancing hybrid quantum system development and engineering entangled solid-state qubits.
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