Year: 2006
Type: article
Abstract: We give a formal algebraic description of Josephson-type quantum dynamical systems, i.e., Hamiltonian systems with a cos ϑ-like potential term. The two-boson Heisenberg algebra plays for such systems the role that the h (1) algebra does for the harmonic oscillator. A single Josephson junction is selected as a representative of Josephson systems. We construct both logical states (codewords) and logical (gate) operators in the superconductive regime. The codewords are the even and odd coherent states of the two-boson algebra: they are shift-resistant and robust, due to squeezing. The logical operators acting on the qubit codewords are expressed in terms of operators in the enveloping of the two-boson algebra. Such a scheme appears to be relevant for quantum information applications.
Authors: Lara Faoro, Francesco A Raffa, Mario Rasetti
Language: English
Subfield: Atomic and Molecular Physics, and Optics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W1967643725