Quantum Noise as an Entanglement Meter

Author(s)
Klich, Israel; Levitov, Leonid
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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=1/3 logL prediction of conformal field theory.
Date issued
2009-03
URI
http://hdl.handle.net/1721.1/51772
Department
Massachusetts Institute of Technology. Department of Physics
Journal
Physical Review Letters
Publisher
American Physical Society
Citation
Klich, Israel , and Leonid Levitov. “Quantum Noise as an Entanglement Meter.” Physical Review Letters 102.10 (2009): 100502. © 2009 The American Physical Society.
Version: Final published version
ISSN
0031-9007
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