Starts 11 Jun 2024 11:00
Ends 11 Jun 2024 12:00
Central European Time
CMSP Seminar (Joint ICTP/SISSA Statistical Physics): Dynamics of non-interacting fermions subjected to generalized measurement schemes
Leonardo Building, Luigi Stasi Seminar Room (and via Zoom)
Dganit Meidan
(Ben-Gurion University of the Negev, Israel)
(Ben-Gurion University of the Negev, Israel)
Abstract:
Monitored quantum systems offer a new setting to explore quantum many-body physics away from equilibrium. Fueled by the experimental progress in building quantum simulators, their study sheds light on the dynamics of quantum information and entanglement in open quantum systems. In addition, monitored systems also offer the ability to dynamically tailor states with topological order.
In this talk I consider a system of fermions evolving with a non-interacting Hamiltonian and subjected to competing measurements. The unitary evolution builds entanglement while repeated measurements disentangle the local degrees of freedom resulting in a measurement induced phase transition (MIPT).
We employ a generalized measurement scheme with variable coupling between the system and detector. When the coupling is strong - this is akin to a projective measurement. When the coupling is weak, this describes continuous measurements where the information extracted by the detector and the duration of the measurement are reduced to zero simultaneously. This scheme allows us to study how the coupling between system and detector alters the MIPT.
To gain further insight into the transition, we study the deterministic dynamics which arises when only a single detector outcome is retained. This post selected limit is governed by a non-hermitian Hamiltonian. Finally, I introduce a partial-post-selection procedure that interpolates between the monitored dynamics and the post selected limit, and discuss the evolution of the MIPT between these two limits.
In this talk I consider a system of fermions evolving with a non-interacting Hamiltonian and subjected to competing measurements. The unitary evolution builds entanglement while repeated measurements disentangle the local degrees of freedom resulting in a measurement induced phase transition (MIPT).
We employ a generalized measurement scheme with variable coupling between the system and detector. When the coupling is strong - this is akin to a projective measurement. When the coupling is weak, this describes continuous measurements where the information extracted by the detector and the duration of the measurement are reduced to zero simultaneously. This scheme allows us to study how the coupling between system and detector alters the MIPT.
To gain further insight into the transition, we study the deterministic dynamics which arises when only a single detector outcome is retained. This post selected limit is governed by a non-hermitian Hamiltonian. Finally, I introduce a partial-post-selection procedure that interpolates between the monitored dynamics and the post selected limit, and discuss the evolution of the MIPT between these two limits.