Speaker
Description
We develop a Quantum Monte Carlo method based on the Replica trick in order to calculate Renyi Negativities of any order. These quantities serve as multipartite and mixed state Entanglement measures. This method has been succesful in estimating Entanglement Entropies and is extended to Renyi Negativities. Subjecting the replicas to a non equilibrium protocol transforming their configuration according to the structure of their respective partially transposed density matrices, the estimator is obtained by applying a fluctuation-dissipation theorem known as Jarzynskis equality, relating the performed mechanical work to the Free energy. This is implemented on the basis of the Stochastic Series Expansion algorithm which is benchmarked on the dimerized Heisenberg model. Investigated near the Groundstate the model exhibits a quantum critical transition.