Work

Quantum Noise as an Entanglement Meter

Year: 2009

Type: article

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.

Source: Physical Review Letters

DOI: 10.1103/physrevlett.102.100502

Authors: Israel Klich, Leonid Levitov

Institutions: University of California, Santa Barbara, Kavli Institute for Theoretical Physics, Massachusetts Institute of Technology

Language: English

Topic: Quantum and electron transport phenomena

Subfield: Atomic and Molecular Physics, and Optics

Field: Physics and Astronomy

Domain: Physical Sciences

Open Access status: bronze

Funders: National Science Foundation, W. M. Keck Foundation

Award: Kavli Institute for Theoretical Physics