Quantum Noise as an Entanglement Meter

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dc.creatorKlich, Israel
dc.creatorLevitov, Leonid
dc.date2008-04-08
dc.date2008-06-11
dc.date.accessioned2026-07-07T12:49:43Z
dc.date.available2026-07-07T12:49:43Z
dc.descriptionEntanglement entropy, which is a measure of quantum correlations between separate parts of a many-body system, has emerged recently as a fundamental quantity in broad areas of theoretical physics, from cosmology and field theory to condensed matter theory and quantum information. The universal appeal of the entanglement entropy concept is related, in part, to the fact that it is defined solely in terms of the many-body density matrix of the system, with no relation to any particular observables. However, for the same reason, it has not been clear how to access this quantity experimentally. Here we derive a universal relation between entanglement entropy and the fluctuations of current flowing through a quantum point contact (QPC) which opens a way to perform a direct 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 log L prediction of conformal field theory.
dc.identifierhttps://arxiv.org/abs/0804.1377
dc.identifierhttp://arxiv.org/abs/0804.1377
dc.identifierPhys. Rev. Lett. 102, 100502 (2009)
dc.identifierdoi:10.1103/PhysRevLett.102.100502
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/222466
dc.subjectQuantum Physics
dc.subjectAstrophysics
dc.subjectMesoscale and Nanoscale Physics
dc.subjectHigh Energy Physics - Theory
dc.titleQuantum Noise as an Entanglement Meter
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