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Sensing Coherent Dynamics of Electronic Spin Clusters in Solids
E L Rosenfeld1, L M Pham2, M D Lukin1
1Department of Physics, Harvard University, Cambridge, Massachusetts 02138, USA.
Physical Review Letters
|June 30, 2018
Summary
Researchers demonstrate coherent spin exchange between identical electronic spins in solids. This breakthrough advances quantum control for room-temperature solid-state quantum processors using nitrogen vacancy centers in diamond.
Area of Science:
- Quantum Information Science
- Solid-State Physics
- Quantum Computing
Background:
- Quantum control of electronic spins is crucial for scalable quantum computing.
- Nitrogen vacancy (NV) centers in diamond are promising solid-state qubits.
- Interactions between spins are key to performing quantum operations.
Purpose of the Study:
- To demonstrate coherent spin exchange between identical electronic spins in a solid state.
- To achieve full quantum control of electronic spin registers at room temperature.
- To explore the potential for fast quantum gate operations and state transfer.
Main Methods:
- Utilizing a single nitrogen vacancy (NV) center in a diamond substrate.
- Coupling the NV center to two adjacent S=1/2 dark electron spins via magnetic dipolar interaction.
- Employing detailed spectroscopy to quantify NV-electron and electron-electron couplings.
Main Results:
- Observed coherent spin exchange between identical electronic spins.
- Quantified NV-electron and electron-electron couplings, agreeing with theoretical models.
- Demonstrated conditional coherent flip-flop dynamics between electronic spins.
- Showcased selective coupling and polarization transfer between NV and electron spins.
Conclusions:
- Coherent spin exchange in solids is achievable, paving the way for quantum control.
- The observed spin dynamics are essential for building robust quantum processors.
- This work enables fast quantum gates and state transfer in scalable, room-temperature systems.
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