# Coupling-assisted Landau-Majorana-Stuckelberg-Zener transition in two-interacting-qubit systems

## TL;DR

This paper demonstrates that two interacting spin-qubits can undergo Landau-Majorana-Stückelberg-Zener transitions driven solely by their coupling, enabling interaction estimation and entanglement generation without external transverse fields.

## Contribution

It reveals a novel mechanism for LMSZ transitions driven by qubit coupling, and explores applications in interaction measurement and entanglement creation.

## Key findings

- LMSZ transitions occur without external transverse field due to coupling.
- Coupling strength can be estimated from transition dynamics.
- Entanglement can be generated by tuning the ramp slope.

## Abstract

We analyse a system of two interacting spin-qubits subjected to a Landau-Majorana-St\"uckelberg-Zener (LMSZ) ramp. We prove that LMSZ transitions of the two spin-qubits are possible without an external transverse static field since its role is played by the coupling between the spin-qubits. We show how such a physical effect could be exploited to estimate the strength of the interaction between the two spin-qubits and to generate entangled states of the system by appropriately setting the slope of the ramp. Moreover, the study of effects of the coupling parameters on the time-behaviour of the entanglement is reported. Finally, our symmetry-based approach allows us to discuss also effects stemming from the presence of a classical noise or non-Hermitian dephasing terms.