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. ISSN 1098-0121

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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 > Physics
Journal or Publication Title:	Physical Review B (Condensed Matter and Materials Physics)
Publisher:	American Physical Society
ISSN:	1098-0121
Date:	December 2009
Volume:	Vol.80
Number:	No.24
Number of Pages:	12
Page Range:	Article no. 245308
Identification Number:	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)
URI:	http://wrap.warwick.ac.uk/id/eprint/16673

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