# Area D: Pushing the limits of quantum cooperativity

### Summary of the area

The projects of Area D target to identify the foundational principles of quantum cooperative behavior. The purpose is to set the ground for a comprehensive theory that will permit to define what is quantum cooperativity in its generality, when a physical system can exhibit quantum cooperativity, how cooperativity can be designed, and which experimental setups are most promising for observing quantum cooperative behavior at the mesoscopic scale. The quantum cooperative dynamics, which are the platforms of these theoretical studies include superradiance, quantum synchronization, and quantum critical behavior in driven-dissipative systems. Projects in area D serve as pathfinder beyond the first funding period, both for exploring future experimental situations and setups, where novel cooperative effects may be prepared and studied, but also for guiding the eye for future theory projects and a more complete embedding of cooperativity in the framework of complex open manybody systems.

### Projects

- D01 – Cooperative effects in coupled quantum emitter systems
- D02 – Spatio-temporal structures in interacting spin systems
- D03 – Competing interactions in strongly correlated light-matter assemblies
- D04 – Synchronising quantum spins with long-range dissipation
- D05 – Quantum Cooperativity and Synchronization
- D06 – Entangling collective behavior of quantum materials and quantum light

### Publications

### 2022

**Cooperative Quantum Phenomena in Light-Matter Platforms**

In:**PRX Quantum**3 (2022)

ISSN: 2691-3399

DOI: 10.1103/PRXQuantum.3.010201
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### 2021

**Perturbation theory of nearly spherical dielectric optical resonators**

In:**Physical Review A**104 (2021)

ISSN: 1050-2947

DOI: 10.1103/PhysRevA.104.023516
, , :**Effect of Active Photons on Dynamical Frustration in Cavity QED**

In:**Physical Review Letters**126 (2021), Article No.: 133603

ISSN: 0031-9007

DOI: 10.1103/PhysRevLett.126.133603
, , :**Quantum-critical properties of the long-range transverse-field Ising model from quantum Monte Carlo simulations**

In:**Physical Review B**103 (2021)

ISSN: 0163-1829

DOI: 10.1103/PhysRevB.103.245135
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