Entanglement enhancement for two spins assisted by two phase kicks

TL;DR

This paper demonstrates that applying carefully timed phase kicks to a two-spin system can significantly enhance and stabilize entanglement, especially for larger spins, by creating a plateau in entanglement dynamics.

Contribution

It introduces a method of using phase kicks to enhance and sustain entanglement in two-spin systems, improving upon previous approaches without such interventions.

Findings

Phase kicks increase entanglement compared to no-kick evolution.

Enhanced entanglement leads to a plateau in I-concurrence for large spins.

Numerical results show substantial entanglement improvement with phase kicks.

Abstract

We study the entanglement dynamics in a two-spin system governed by a bilinear Hamiltonian and assisted by phase kicks. It is found that the application of instant kicks to both spins at some specific moments leads to enhancement of entanglement. This procedure also improves the transient character of entanglement leading, for large spins, to a formation of a plateau for the I-concurrence. We have numerically investigated the spin-spin dynamics for several values of spins and observed a substantial enhancement of entanglement in comparison to the evolution without kicks.