Entanglement and quantum noise: Is it possible to measure entanglement entropies?

          @misc{ pirsa_PIRSA:11040071,
            doi = {10.48660/11040071},
            url = {https://pirsa.org/11040071},
            author = {Fradkin, Eduardo},
            keywords = {Condensed Matter},
            language = {en},
            title = {Entanglement and quantum noise: Is it possible to measure entanglement entropies?},
            publisher = {Perimeter Institute},
            year = {2011},
            month = {apr},
            note = {PIRSA:11040071 see, \url{https://pirsa.org}}
          }
          

Abstract

I will discuss the growth of entanglement under a quantum quench at point contacts of simple fractional quantum Hall fluids and its relation with the measurement of local observables. Recently Klich and Levitov recently proposed that, for a free fermion system, the noise generated from a local quantum quench provides a measure of the entanglement entropy. In this work, I will examine the validity of this proposal in the context of a strongly interacting system, the Laughlin FQH states. We find that local quenching in fractional quantum Hall junctions gives time dependent correlation functions that have universal behavior on sufficiently long time and length scales. The growth of entanglement entropy and the noise generated by the quench are generally unrelated quantities.