Environment-induced entanglement generation for two qubits in the presence of qubit-qubit interaction noise

TL;DR

This paper demonstrates how entanglement between two qubits can be generated and preserved using environment interactions and control pulses, even in the presence of qubit-qubit interaction noise, through an exactly solvable dephasing model.

Contribution

It introduces a method to generate near-perfect entanglement by applying tailored control pulses in a pure dephasing environment, accounting for qubit interaction noise and timing delays.

Findings

Control pulses can effectively generate entanglement despite environmental decoherence.

Introducing a time delay between pulses helps maintain entanglement when qubits have direct interactions.

Near-perfect entanglement is achievable even with noise in qubit interactions.

Abstract

Using an exactly solvable pure dephasing model, we show how entanglement between qubits can be generated via the interaction with a common environment and concurrent application of suitable control pulses. The control pulses are able to effectively remove the detrimental effect of the environment while preserving the indirect interaction between the qubits, thereby leading to the generation of near-perfect entanglement. Furthermore, we also investigate the entanglement dynamics if the qubits are directly interacting; this interaction may even contain a noise term. The present of this additional noise leads to an additional decoherence term. This decoherence term cannot be removed by applying the pulses at the same time to both qubits. Rather, we show that by introducing a time delay between the two pulse sequences, near-perfect entanglement can still be generated via the interaction with the common environment.