Harnessing entanglement and decoherence in driven-dissipative quantum impurities

• Applicant: Professor Dr. Jamir Marino
• Subject Area: Theoretical Condensed Matter Physics ; Optics, Quantum Optics and Physics of Atoms, Molecules and Plasmas
• Term: since 2021
• Project identifier: Deutsche Forschungsgemeinschaft (DFG) - Project number 471301521

The project ‘HADE-QUAM’ explores entanglement transitions and decoherence control in the noise driven dynamics of quantum impurities coupled to a fermionic many-body environment. The project is articulated in two phases: first, we will first study the onset of dynamical phase transitions monitored by quantum entanglement in interacting fermionic wires driven by local heating. The research vision is to promote dissipative impurities as a proxy for novel forms of non-equilibrium phase transition in cold atoms experiments. In the second stage of the project, we study the critical slowdown of decoherence when noise intertwines with gapless modes. The setup is inspired by the prototypical Kondo model, and it will serve to test a conjecture on the description of many-body driven-dissipative dynamics in terms of bosonised variables. ‘HADE-QUAM’ is an interdisciplinary project in its methods (variational calculations, cumulant expansions, matrix-product states, non-equilibrium field theory and renormalisation group), and it aims at connecting topics at the interface of diverse research areas in physics, ranging from many particle problems in condensed matter and in open quantum systems, including questions relevant for non-equilibrium statistical mechanics and quantum entanglement. The two aspects studied in ‘HADE-QUAM’ are interconnected, and one of the long-term goals of the project is to propose experiments based on quantum magnetic impurity devices capable to witness universal phase transitions for entanglement and decoherence, in the strongly dissipative regime.

• DFG Programme: Research Grants