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28 March 2024
 
  » arxiv » 0904.3656

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Noise-Induced Spectral Shift Measured in a Double Quantum Dot
Bruno Küng ; Simon Gustavsson ; Theodore Choi ; Ivan Shorubalko ; Thomas Ihn ; Silke Schön ; Fabian Hassler ; Gianni Blatter ; Klaus Ensslin ;
Date 23 Apr 2009
AbstractWe measure the shot-noise of a quantum point-contact using a capacitively coupled InAs double quantum dot as an on-chip sensor. Our measurement signals are the (bidirectional) inter-dot electronic tunneling rates which are determined by means of time-resolved charge sensing. The detector frequency is set by the relative detuning of the energy levels in the two dots. For non-zero detuning, the noise in the quantum point-contact generates inelastic tunneling in the double dot and thus causes an increase of the interdot tunneling rate. Conservation of spectral weight in the dots implies that this increase must be compensated by a decrease of the rate close to zero detuning, which is quantitatively confirmed in our experiment.
Source arXiv, 0904.3656
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