The project has addressed the problem of probing and characterizing quantum entanglement in quantum many-body systems, especially in the presence of drive and dissipation. A special focus has been placed on the study of exciton-polariton systems, which represent a very relevant experimental platform to investigate such fundamental questions.
In particular, we have :
- developed new methods of fundamental interest to quantum information science to detect quantum entanglement in many-body systems
- studied, in a joint theory-experiment collaboration, the prospects of exciton-polariton platforms to generated quantum-entangled photon pairs.
Quantum entanglement in many-body systems represent a key physical property in the context of quantum technologies, especially for quantum computing and sensing. Many fundamental questions remain to be addressed before quantum computing hardwares can find a route towards technology applications. The QuoMoDys project contributes to asking and answering such fundamental questions.
The main conclusions of the action are that:
- on the quantum information theory level, certification of relevant properties of quantum many-body systems is possible, even in the absence of full-state tomography. This is a key asset for quantum technologies given that full-state tomography is unfeasible beyond about a dozen of qubits.
- on the more specific platform of exciton-polaritons, the interplay of intrinsic quantum noise with the thermal noise of the solid-state lattice in which the system is embedded had been overlooked in previous works; our work lays the ground to future developments devoted to enhance the quantum contribution, given potentially rise to quantum entanglement among the photons leaving the system.
