Physics – Condensed Matter – Superconductivity
Scientific paper
2011-05-07
Nuclear Physics, Section B 852 (2011), pp. 235-268
Physics
Condensed Matter
Superconductivity
36 pages, 4 figures
Scientific paper
10.1016/j.nuclphysb.2011.06.014
We use boundary field theory to describe the phases accessible to a tetrahedral qubit coupled to Josephson junction chains acting as Tomonaga-Luttinger liquid leads. We prove that, in a pertinent range of the fabrication and control parameters, an attractive finite coupling fixed point emerges due to the geometry of the composite Josephson junction network. We show that this new stable phase is characterized by the emergence of a quantum doublet which is robust not only against the noise in the external control parameters (magnetic flux, gate voltage) but also against the decoherence induced by the coupling of the tetrahedral qubit with the superconducting leads. We provide protocols allowing to read and to manipulate the state of the emerging quantum doublet and argue that a tetrahedral Josephson junction network operating near the new finite coupling fixed point may be fabricated with today's technologies.
Cirillo Antonio
Giuliano Domenico
Mancini Matteo
Sodano Pasquale
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