Bare-Excitation Ground State of a Spinless-Fermion -- Boson Model and $W$-State Engineering in an Array of Superconducting Qubits and Resonators

Abstract

This work 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.

final, published version; for a closely related realization of W states using Rydberg-dressed qubits, see arXiv:2101.11232 [ Phys. Rev. A 103, 022410 (2021) ]; for a non-technical summary of both works, see http://www.iap.tu-darmstadt.de/tqp/grp_stojanovic/Wentangle_PopularSummary.pdf

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• Scalable $W$-type entanglement resource in neutral-atom arrays with Rydberg-dressed resonant dipole-dipole interaction
• Dicke-state preparation through global transverse control of Ising-coupled qubits
• Generating Bell states and $N$-partite $W$ states of long-distance qubits in superconducting waveguide QED
• Dynamical generation of chiral $W$ and Greenberger-Horne-Zeilinger states in laser-controlled Rydberg-atom trimers
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• Interconversion of $W$ and Greenberger-Horne-Zeilinger states for Ising-coupled qubits with transverse global control
• Unified generation and fast emission of arbitrary single-photon multimode $W$ states
• Coherent Atom Transport via Enhanced Shortcuts to Adiabaticity: Double-Well Optical Lattice
• Robust topological feature against non-Hermiticity in Jaynes-Cummings Model
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• Spin Winding and Topological Nature of Transitions in Jaynes-Cummings Model with Stark Non-linear Coupling
• Quantum Fisher information and polaron picture for identification of transition coupling in quantum Rabi model
• Twist-and-turn dynamics of spin squeezing in bosonic Josephson junctions: Enhanced shortcuts-to-adiabaticity approach
• Entangling distant systems via universal nonadiabatic passage
• Spectral features of polaronic excitations in a superconducting analog simulator
• Mixed-state phase transitions in spin-Holstein models
• Digital Quantum Simulation of Scalar Yukawa Coupling
• Generalized Parity Measurements and Efficient Large Multi-component Cat State Preparation with Quantum Signal Processing
• Harnessing subspace controllability: Dynamical generation of Dicke states in Heisenberg-coupled qubit arrays with a single local control
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