Entanglement protection of classically driven qubits in a lossy cavity
Authors: Nourmandipour A., Vafafard A., MortezapourA., Franzosi R.
Autors Affiliation: 1) Department of Physics, Sirjan University of Technology, 7813733385 Sirjan, Iran; QSTAR & CNR – Istituto Nazionale di Ottica, Largo Enrico Fermi 2, 50125 Firenze, Italy.
2) QSTAR & CNR – Istituto Nazionale di Ottica, Largo Enrico Fermi 2, 50125 Firenze, Italy.
3) Department of Physics, University of Guilan, P. O. Box 41335-1914, Rasht, Iran.
4) QSTAR & CNR – Istituto Nazionale di Ottica, Largo Enrico Fermi 2, 50125 Firenze, Italy.
Abstract: Quantum technologies able to manipulating single quantum systems, are presently developing. Among the dowries of the quantum realm, entanglement is one of the basic resources for the
novel quantum revolution. Within this context, one is faced with the problem of protecting the entanglement when a system state is manipulated. In this paper, we investigate the effect of the classical driving field on the generation entanglement between two qubits interacting with a bosonic environment. We discuss the effect of the classical field on the generation of entanglement between two (different) qubits and the conditions under which it has a constructive role in protecting the initial- state entanglement from decay induced by its environment. In particular, in the case of similar qubits, we locate a stationary sub-space of the system Hilbert space, characterized by states non depending on the environment properties as well as on the classical driving-field. Thus, we are able to determine the conditions to achieve maximally entangled stationary states after a transient interaction with
the environment. We show that, overall, the classical driving field has a constructive role for the entanglement protection in the strong coupling regime. Also, we illustrate that a factorable initial- state can be driven in an entangled state and, even, in an entangled steady-state after the interaction with the environment.
Journal/Review: SCIENTIFIC REPORTS
Volume: 11:16259 Pages from: 1 to: 13
KeyWords: Quantum entanglement, Atoms cavity dynamicsDOI: 10.1038/s41598-021-95623-1