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Conference on Lasers and Electro-Optics

Two photon emission from superluminal and accelerating index changes

Jamison Sloan, Nicholas Rivera, John D. Joannopoulos, Marin Soljacic A

Published Jan 1, 2021• 0 citations
Publisher

Abstract

We show that superluminal and accelerating index perturbations in dielectric media can act as sources of entangled photon pairs. We show how these sources can be realized in various nonlinear nanophotonic platforms.
DOI
10.1364/cleo_qels.2021.fm3n.4

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We develop a perturbative theory that describes a superluminal refractive perturbation propagating in a dispersive medium and the subsequent excitation of the quantum vacuum zero-point fluctuations. We find a pro-cess similar to the anomalous Doppler effect: Photons are emitted in correlated pairs and mainly within a Cerenkov-like cone, one on the forward and the other in backward directions. The number of photon pairs emitted from the perturbation increases strongly with the degree of superluminality and under realizable experimental conditions; it can reach up to $\ensuremath{\sim}101010{}^{\ensuremath{-}2}$ photons per pulse. Moreover, it is, in principle, possible to engineer the host medium so as to modify the effective group refractive index. In the presence of ``fast-light'' media, e.g., a with group index smaller than unity, a further $\ensuremath{\sim}101010\ifmmode\times\else\texttimes\fi{}$ enhancement may be achieved and the photon emission spectrum is characterized by two sharp peaks that, in future experiments, would clearly identify the correlated emission of photon pairs.