title: Quantum noise as an entanglement meter.
abstract: Transport in a quantum point contact (QPC) can be used to generate many-body entanglement of Fermi seas in the leads. A universal relation is found between the generated entanglement entropy and the fluctuations of electric current, which is valid for any protocol of driving the QPC. This relation offers a basis for direct electric measurement of entanglement entropy. In particular, by utilizing space-time duality of 1D systems, we relate electric noise generated by opening and closing the QPC periodically in time with the seminal S=1/3logL prediction of conformal field theory.
authors.affiliation: Kavli Institute for Theoretical Physics, University of California Santa Barbara, Santa Barbara, California 93106, USA.
authors.forename: Israel
authors.initials: I
authors.lastname: Klich
authors.forename: Leonid
authors.initials: L
authors.lastname: Levitov