Edge-state Fabry-Perot interferometer as a high sensitivity charge detector

Details Edge-state Fabry-Perot interferometer as a high sensitivity charge detector Edge-state Fabry-Perot interferometer as a high sensitivity charge detector

2008-06-05

arxiv.org/abs/0806.0913v2

Phys. Rev. B 79, 233302 (2009)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages 2 fig, submitted to PRL

Scientific paper

We present a scheme for high sensitivity charge detection in the integer quantum Hall regime using two point contacts in a series. The setup is an electronic analog of an optical Fabry-Perot interferometer. We show that for small transmission through the point contacts the sensitivity of the interferometer is very high due to multiple reflections at the point contacts. The sensitivity can be further enhanced twice by using electrons in spin entangled state. We show that for point contacts having different reflection probabilities, the interferometer can be tuned for the quantum limited measurement.

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