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Mapping a 50-spin-qubit network through correlated sensing
G L van de Stolpe1,2, D P Kwiatkowski1,2, C E Bradley1,2
1QuTech, Delft University of Technology, PO Box 5046, 2600, GA Delft, The Netherlands.
Nature Communications
|March 5, 2024
Summary
Researchers mapped a 50-spin network using a single nitrogen-vacancy (NV) center in diamond. This high-resolution technique advances quantum simulation and sensing by enabling the study of larger spin systems.
Area of Science:
- Quantum physics
- Solid-state defect research
- Quantum information science
Background:
- Optically accessible solid-state defects are key for quantum simulation, sensing, and communication.
- Previous studies demonstrated control over nuclear spins around a single electron spin defect.
- Limited spectral resolution has restricted the size of addressable spin networks.
Purpose of the Study:
- To overcome spectral resolution limitations in mapping spin networks.
- To develop a high-resolution method for characterizing large coupled spin systems.
- To expand the capabilities of quantum simulation and sensing platforms.
Main Methods:
- Utilized a single nitrogen-vacancy (NV) center in diamond for correlated sensing.
- Developed concatenated double-resonance sequences for spin-chain identification.
- Fused identified spin-chains to reconstruct the entire spin network.
Main Results:
- Successfully mapped a network of 50 coupled spins with high spectral resolution.
- Identified characteristic spin frequencies and interconnections within the network.
- Demonstrated a method for fusing individual spin-chain data into a comprehensive network map.
Conclusions:
- The developed high-resolution correlated sensing scheme significantly increases the accessible size of spin networks.
- This advancement offers new possibilities for quantum simulations by increasing the number of usable spin qubits.
- The methodology holds potential for nanoscale imaging of external complex spin systems.
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