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Stability of macroscopic entanglement under decoherence
1Sektion Physik, Ludwig-Maximilians-Universität München, Theresienstrasse 37, D-80333 Münich, Germany.
Physical Review Letters
|June 1, 2004
Summary
We studied how decoherence affects macroscopic entanglement. For some states, entanglement lifetime decreases with system size, while for others, it remains constant.
Area of Science:
- Quantum physics
- Quantum information science
Background:
- Macroscopic entanglement is crucial for quantum technologies.
- Decoherence poses a significant challenge to maintaining quantum states.
Purpose of the Study:
- To investigate the decoherence effects on the lifetime of macroscopic entanglement.
- To compare entanglement decay in different quantum state types.
Main Methods:
- Analysis of Greenberger-Horne-Zeilinger (GHZ)-type superposition states.
- Examination of cluster states under decoherence.
- Theoretical modeling of entanglement dynamics.
Main Results:
- For GHZ states, entanglement lifetime decreases with increasing system size.
- The number of entangled subsystems in GHZ states diminishes over time.
- Entanglement lifetime for cluster states is independent of system size.
Conclusions:
- System size impacts entanglement lifetime differently across various quantum states.
- Cluster states offer a more robust platform for macroscopic entanglement against decoherence compared to GHZ states.
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