Shaping the quantum vacuum with anisotropic temporal boundaries

TL;DR

This paper explores how anisotropic temporal boundaries in quantum systems can control vacuum amplification effects, enabling directional photon generation and manipulation of quantum states.

Contribution

It introduces the concept of anisotropic temporal boundaries for vacuum control, demonstrating theoretical methods to manipulate photon emission directionality and amplification.

Findings

Anisotropic boundaries control angular photon distribution.

Multiple configurations yield different vacuum amplification effects.

Directional photon generation can be inhibited or enhanced.

Abstract

Temporal metamaterials empower novel forms of wave manipulation with direct applications to quantum state transformations. In this work, we investigate vacuum amplification effects in anisotropic temporal boundaries. Our results theoretically demonstrate that the anisotropy of the temporal boundary provides control over the angular distribution of the generated photons. We analyze several single and multi-layered configurations of anisotropic temporal boundaries, each with a distinct vacuum amplification effect. Examples include the inhibition of photon production along specific directions, resonant and directive vacuum amplification, the generation of angular and frequency photon combs, and fast angular variations between inhibition and resonant photon production.