Quantum switches and quantum memories for matter-wave lattice solitons

TL;DR

This paper explores how matter-wave lattice solitons can be manipulated using optical lattice defects to create quantum switches and memories, enabling controlled transmission, reflection, and storage of solitons.

Contribution

It introduces a novel method for controlling matter-wave solitons with optical lattice defects, demonstrating potential for quantum switching and memory applications.

Findings

Solitons undergo abrupt transmission-reflection transition at a critical barrier height.

Solitons can be trapped and released on demand in potential wells, functioning as quantum memory.

Defects enable control over interactions between multiple solitons.

Abstract

We study the possibility of implementing a quantum switch and a quantum memory for matter wave lattice solitons by making them interact with "effective" potentials (barrier/well) corresponding to defects of the optical lattice. In the case of interaction with an "effective" potential barrier, the bright lattice soliton experiences an abrupt transition from complete transmission to complete reflection (quantum switch) for a critical height of the barrier. The trapping of the soliton in an "effective" potential well and its release on demand, without loses, shows the feasibility of using the system as a quantum memory. The inclusion of defects as a way of controlling the interactions between two solitons is also reported.