Year: 2023
Type: peer-review
Abstract: We explain how to apply a Gaussian-preserving operator to a fermionic Gaussian state.We use this method to study the evolution of the entanglement entropy of an Ising spin chain undergoing a quantum-jump dynamics with string measurement operators.We find that, for finite-range string operators, the asymptotic entanglement entropy exhibits a crossover from a logarithmic to an area-law scaling with the system size, depending on the Hamiltonian parameters as well as on the measurement strength.For ranges of the string which scale extensively with the system size, the asymptotic entanglement entropy shows a volume-law scaling, independently of the measurement strength and the Hamiltonian dynamics.The same behavior is observed for the measurement-only dynamics, suggesting that measurements may play a leading role in this context.B Quantum-jump protocol 20 C Evolution of the state: a different derivation 21 References 22
Language: English
Topic: Quantum many-body systems
Subfield: Atomic and Molecular Physics, and Optics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: gold
OpenAlex ID: W4388716522