Strong back-action of a linear circuit on a single electronic quantum channel

Details Strong back-action of a linear circuit on a single electronic quantum channel Strong back-action of a linear circuit on a single electronic quantum channel

2011-08-31

arxiv.org/abs/1108.6216v1

Nature Physics 7, 935-938 (2011)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

11 pages including supplementary information, to be published in Nature Physics

Scientific paper

10.1038/nphys2092

What are the quantum laws of electricity in mesoscopic circuits? This very fundamental question has also direct implications for the quantum engineering of nanoelectronic devices. Indeed, when a quantum coherent conductor is inserted into a circuit, its transport properties are modified. In particular, its conductance is reduced because of the circuit back-action. This phenomenon, called environmental Coulomb blockade, results from the granularity of charge transfers across the coherent conductor. Although extensively studied for a tunnel junction in a linear circuit, it is only fully understood for arbitrary short coherent conductors in the limit of small circuit impedances and small conductance reduction. Here, we investigate experimentally the strong back-action regime, with a conductance reduction of up to 90%. This is achieved by embedding a single quantum channel of tunable transmission in an adjustable on-chip circuit of impedance comparable to the resistance quantum $R_K=h/e^2$ at microwave frequencies. The experiment reveals important deviations from calculations performed in the weak back-action framework, and matches with recent theoretical results. From these measurements, we propose a generalized expression for the conductance of an arbitrary quantum channel embedded in a linear circuit.

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