Back-action noise in strongly interacting systems: the dc SQUID and the interacting quantum point-contact

Details Back-action noise in strongly interacting systems: the dc SQUID and the interacting quantum point-contact Back-action noise in strongly interacting systems: the dc SQUID and the interacting quantum point-contact

2005-07-09

arxiv.org/abs/cond-mat/0507223v1

Phys. Rev. Lett. 96, 056801 (2006).

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

5 pages, 1 figure

Scientific paper

We study the back-action noise and measurement efficiency (i.e. noise temperature) of a dc SQUID amplifier, and equivalently, a quantum point contact detector formed in a Luttinger liquid. Using a mapping to a dissipative tight-binding model, we show that these systems are able to reach the quantum limit even in regimes where several independent transport processes contribute to the current. We suggest how this is related to the underlying integrability of these systems.

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