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Local probe of single phonon dynamics in warm ion crystals
A Abdelrahman1,2, O Khosravani1, M Gessner3,4,5
1Department of Physics, University of California, Berkeley, California 94720, USA.
Nature Communications
|June 10, 2017
Summary
Researchers can now measure complex quantum properties in large systems by observing just one part. This breakthrough aids scalable quantum computation and many-body physics research.
Area of Science:
- Quantum Information Science
- Condensed Matter Physics
- Quantum Many-Body Systems
Background:
- Characterizing coherence in large quantum systems is crucial for quantum computation and understanding complex physics.
- Existing methods often require access to the entire system, limiting scalability.
Purpose of the Study:
- To develop a method for extracting non-trivial coherence properties from a small, controllable part of a composite quantum system.
- To demonstrate this method's applicability in large systems, specifically trapped ion chains.
Main Methods:
- Utilizing interferometric measurements on a single ion within a trapped ion chain.
- Analyzing autocorrelation functions and quantum discord between different degrees of freedom.
- Tracing the dynamics of a single phonon excitation.
Main Results:
- Successfully extracted autocorrelation functions and quantum discord from local measurements.
- Observed the spreading and partial refocusing of phonon excitations in chains up to 42 ions.
- Demonstrated that local observables reflect the dynamical evolution of quantum discord.
Conclusions:
- A scalable method for characterizing quantum coherence in large systems has been demonstrated.
- This approach simplifies the study of non-equilibrium many-body physics and advances quantum computation.
- Local measurements provide rich information about global quantum properties.
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