Multipartite stationary entanglement generation in the presence of dipole-dipole interaction in an optical cavity

Year: 2022

Authors: Vafafard A.; Nourmandipour A.; Franzosi R.

Autors Affiliation: QSTAR and CNR, Istituto Nazionale di Ottica, Largo Enrico Fermi 2, I-50125 Firenze, Italy; Department of Physics, Sirjan University of Technology, 7813733385 Sirjan, Iran; DSFTA, University of Siena, Via Roma 56, 53100 Siena, Italy; INFN Sezione di Perugia, I-06123 Perugia, Italy

Abstract: Engineering a stationary entanglement between atoms or ions placed at small distances is a challenging problem in quantum information science. In this paper, the stationary and dynamics of entanglement in a system of dipole-coupled qubits interacting with a single-mode optical cavity in the strong coupling regime are theoretically investigated. We find that the entanglement in the steady state can be induced and tuned in nonresonance cases by considering the dipole-dipole interaction (DDI) between the qubits. We also point out that the novel measure used in this study can quantify the net multiqubit entanglement in the system. By increasing the DDI intensity, the behavior of the system depends on the number of qubits. Interestingly, with only two qubits, the amounts of steady-state entanglement enhances as the DDI intensity increases. For a system with more than two qubits, we find that DDI in the weak range of intensity plays a constructive role in the entanglement between qubits. However, it could destroy the stationary entanglement as the interaction between qubits intensifies. The entanglement of a system consisting of more than two qubits tends to disappear for an ensemble of qubits with smaller interatomic distances that lead to stronger dipolar interaction between nonadjacent qubits. Finally, we study the atomic population transfer as well as the transmitted spectrum.


Volume: 105 (5)      Pages from: 052439-1  to: 052439-8

More Information: A.V., A.N., and R.F. acknowledge support by the QuantERA ERA-NET Co-fund 731473 (Project Q-CLOCKS). R.F. acknowledges support by National Group of Mathematical Physics (GNFM-INdAM). A.V. and A.N. are grateful to Girish Saran Agarwal and Ali Mortezapour for extensive discussions.
DOI: 10.1103/PhysRevA.105.052439