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Will spin-relaxation times in molecular magnets permit quantum information processing?
Arzhang Ardavan1, Olivier Rival, John J L Morton
1Clarendon Laboratory, Department of Physics, University of Oxford, OX1 3PU, United Kingdom.
Physical Review Letters
|March 16, 2007
Summary
Researchers measured spin relaxation times in molecular nanomagnets for the first time. Deuterated samples showed long phase-coherence times, crucial for quantum information applications.
Area of Science:
- Quantum physics
- Materials science
- Chemistry
Background:
- Molecular nanomagnets are promising for quantum information processing.
- Understanding spin relaxation is critical for their application.
Purpose of the Study:
- To measure intrinsic spin-lattice (T1) and phase-coherence (T2) relaxation times in molecular nanomagnets.
- To investigate factors affecting phase-coherence relaxation.
Main Methods:
- X-band pulsed electron-spin resonance spectroscopy.
- Utilized Cr7M heterometallic wheels (M=Ni, Mn).
- Employed deuterated samples to study proton coupling effects.
Main Results:
- Reported T1 and T2 relaxation times for molecular nanomagnets.
- Phase-coherence relaxation is primarily influenced by electron spin coupling to molecular protons.
- Deuterated samples achieved T2 relaxation times of 3 microseconds at low temperatures.
Conclusions:
- Achieved T2 times significantly exceed typical spin manipulation durations.
- Demonstrated the potential of molecular nanomagnets for quantum information applications.
- Proton coupling is a key factor in spin decoherence in these systems.
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