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Updated: Sep 18, 2025
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Measurement-induced entanglement phase transition in free fermion systems
Han-Ze Li1, Zhong Jianxin1, Xue-Jia Yu2,3
1Institute for Quantum Science and Technology, Shanghai University, Shanghai 200444, People's Republic of China.
Summary
Measurement-induced entanglement phase transitions (MIETs) shift quantum systems between entanglement states. This review explores MIETs in free fermion models, examining measurement effects on quantum dynamics and potential experimental applications.
Area of Science:
- Quantum Information Science
- Condensed Matter Physics
Background:
- Measurement-induced entanglement phase transitions (MIETs) describe quantum system state changes driven by local measurements.
- These transitions shift systems between area-law and volume-law entanglement regimes.
Purpose of the Study:
- To review measurement-induced entanglement phase transitions (MIETs) in free fermion models.
- To analyze the interplay between unitary hopping and measurement-induced non-unitarity.
Main Methods:
- Survey of theoretical models focusing on free fermion systems.
- Analysis of the competition between unitary evolution (hopping) and non-unitary evolution (measurements).
Main Results:
- Discussion of ongoing debates concerning the existence of MIETs in one-dimensional systems.
- Investigation into the influence of non-Hermitian skin effects on entanglement transitions.
- Identification of potential experimental platforms for observing MIETs.
Conclusions:
- MIETs offer a unique probe into quantum dynamics and entanglement.
- Open challenges include understanding feedback control and extending the theory to higher dimensions.
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