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Full counting statistics of quantum point contacts with time-dependent transparency

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Zhang, Jin, Sherkunov, Y., d'Ambrumenil, N. and Muzykantskii, B. (2009) Full counting statistics of quantum point contacts with time-dependent transparency. Physical Review B (Condensed Matter and Materials Physics), Vol.80 (No.24). Article no. 245308. doi:10.1103/PhysRevB.80.245308 ISSN 1098-0121.

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Official URL: http://dx.doi.org/10.1103/PhysRevB.80.245308

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Abstract

We analyze the zero-temperature full counting statistics (FCS) for the charge transfer across a biased tunnel junction. We find the FCS from the eigenvalues of the density matrix of outgoing states of one lead. In the general case of a general time-dependent bias and time-dependent transparency we solve for these eigenvalues numerically. We report the FCS for the case of a step pulse applied between the leads and a constant barrier transparency (this case is equivalent to Fermi-edge singularity problem). We have also studied combinations of a time-dependent barrier transparency and biases between the leads. In particular, we look at protocols which excite the minimal number of excitations for a given charge transfer (low-noise electron source) and protocols which maximize entanglement of charge states.

Item Type: Journal Article
Subjects: Q Science > QC Physics
Divisions: Faculty of Science, Engineering and Medicine > Science > Physics
Journal or Publication Title: Physical Review B (Condensed Matter and Materials Physics)
Publisher: American Physical Society
ISSN: 1098-0121
Official Date: December 2009
Dates:
DateEvent
December 2009Published
Volume: Vol.80
Number: No.24
Number of Pages: 12
Page Range: Article no. 245308
DOI: 10.1103/PhysRevB.80.245308
Status: Peer Reviewed
Publication Status: Published
Access rights to Published version: Restricted or Subscription Access
Funder: Engineering and Physical Sciences Research Council (EPSRC)
Grant number: EP/D065135/1 (EPSRC)

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