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Updated: Jan 18, 2026
07:56
A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference
Published on: September 5, 2019
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Multipartite Entanglement Structure of Monitored Quantum Circuits
Arnau Lira-Solanilla1, Xhek Turkeshi1, Silvia Pappalardi1
1Institut für Theoretische Physik, Universität zu Köln, Zülpicher Straße 77, 50937 Cologne, Germany.
Physical Review Letters
|September 10, 2025
Summary
Unstructured monitored quantum circuits do not show multipartite entanglement. However, genuinely multipartite entangled phases are achievable in monitored circuits with specific two-site measurements and protection.
Area of Science:
- Quantum Information Science
- Condensed Matter Physics
- Synthetic Quantum Matter
Background:
- Monitored quantum circuits are key to understanding synthetic quantum matter.
- Quantum information content intrinsically defines these circuits.
- Existing studies lack a multipartite entanglement perspective on monitored phases.
Purpose of the Study:
- To explore monitored quantum phases using multipartite entanglement.
- To investigate the role of quantum Fisher information in these systems.
- To identify conditions for realizing genuinely multipartite entangled phases.
Main Methods:
- Analysis of unstructured monitored random circuits.
- Application of quantum Fisher information to quantify multipartite entanglement.
- Investigation of two-site measurement strategies with protection mechanisms.
Main Results:
- Unstructured monitored random circuits do not exhibit divergent multipartite entanglement at criticality.
- These circuits deviate from standard quantum critical behavior.
- Genuinely multipartite entangled phases are achievable with protected two-site measurements.
Conclusions:
- Multipartite entanglement offers a novel perspective on monitored quantum circuits.
- This framework is valuable for studying interacting monitored circuits.
- The findings contribute to understanding noisy quantum dynamics.
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