Telegraph Noise in Coupled Quantum Dot Circuits Induced by a Quantum Point Contact

Details Telegraph Noise in Coupled Quantum Dot Circuits Induced by a Quantum Point Contact Telegraph Noise in Coupled Quantum Dot Circuits Induced by a Quantum Point Contact

2008-01-25

arxiv.org/abs/0801.4002v2

Phys. Rev. Lett. 100, 176805 (2008)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 3 figures (as published)

Scientific paper

10.1103/PhysRevLett.100.176805

Charge detection utilizing a highly biased quantum point contact has become the most effective probe for studying few electron quantum dot circuits. Measurements on double and triple quantum dot circuits is performed to clarify a back action role of charge sensing on the confined electrons. The quantum point contact triggers inelastic transitions, which occur quite generally. Under specific device and measurement conditions these transitions manifest themselves as bounded regimes of telegraph noise within a stability diagram. A nonequilibrium transition from artificial atomic to molecular behavior is identified. Consequences for quantum information applications are discussed.

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