Backaction noise in strongly interacting systems: the dc SQUID and the interacting quantum point contact.
We study the backaction noise and measurement the 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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Department of Physics, McGill University, Montréal, Québec H3A 2T8, Canada.