Measurement induced focussing of radiation from independent single photon sources

TL;DR

The paper introduces a measurement-based technique that significantly enhances the directionality of photons emitted by independent single-photon sources, achieving near-perfect focusing through multi-photon detection.

Contribution

It demonstrates a novel measurement-induced focusing method for photons from independent sources, with potential applications in quantum optics and photonic technologies.

Findings

Detection of m-1 photons in a specific direction increases the probability of detecting the m-th photon in the same direction to nearly 100%.

The focusing effect is observable even for m > 2 photons.

The technique enhances photon directionality using multi-photon detection without requiring entanglement.

Abstract

We present a technique based on multi-photon detection which leads to a strong focussing of photons scattered by independent single photon emitters. For N single photon sources it is shown that if m - 1 photons are detected in a particular direction (with m \leq N) the probability to detect the m-th photon in the same direction can be as high as 100%. This measurement induced focussing effect is already clearly visible for m>2.