Bare-Excitation Ground State of a Spinless-Fermion–Boson Model and W-State Engineering in an Array of Superconducting Qubits and Resonators
Vladimir M. Stojanović
DOI 10.1103/PhysRevLett.124.190504 · Physical Review Letters
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Abstract
This Letter unravels an interesting property of a one-dimensional lattice model that describes a single itinerant spinless fermion (excitation) coupled to zero-dimensional (dispersionless) bosons through two different nonlocal coupling mechanisms. Namely, below a critical value of the effective excitation-boson coupling strength, the exact ground state of this model is the zero-quasimomentum Bloch state of a bare (i.e., completely undressed) excitation. It is demonstrated here how this last property of the lattice model under consideration can be exploited for a fast, deterministic preparation of multipartite W states in a readily realizable system of inductively coupled superconducting qubits and microwave resonators.
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