Arbitrary access temporal pulse cloaking and restoring in periodically poled lithium niobate

TL;DR

This paper introduces a novel temporal pulse cloaking method using second-order nonlinearity in periodically poled lithium niobate, enabling perpetual concealment and restoration of pulse events for enhanced photonic security.

Contribution

It demonstrates a new approach to temporal cloaking leveraging second-order nonlinearity, surpassing previous third-order based methods in efficiency and duration.

Findings

Achieved perpetual pulse concealment and restoration.

Utilized polarization-dependent sum frequency generation.

Ensured pulse security during transmission.

Abstract

Temporal cloaks have inspired the innovation of research on security and efficiency of quantum and fiber communications for concealing temporal events. The existing temporal cloaking approaches possessing ps ~ns cloaking windows employed the third-order nonlinearity mostly. Here we explore a temporal cloak for perpetually concealing pulse events using high efficiency second-order nonlinearity. A temporal pulse event was cloaked as a continuous wave with constant intensity and restored by polarization dependent sum frequency generation processes between the continuous wave and probe. The variety of quasi phase-matching second-order nonlinear processes in periodically poled lithium niobate make sure the pulse event cannot be filched during transmission. The proposed temporal cloak predicts hopeful applications in information security of photonic integrated circuit on lithium niobite thin film.