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IEEE/LEOS Summer Topical Meetings

Generation of photon pairs, triplets, and non-diffracting single photons

Héctor Cruz-Ramírez, Roberto Ramírez-Alarcón, Francisco J. Morelos, Pedro Antonio Quinto-Su, Julio C. Gutiérrez-Vega, Alfred B. U’Ren

Published Jul 1, 2013• 0 citations
Publisher

Abstract

We discuss the generation of non-classical light with optimized properties including photon pairs ranging from factorable to highly entangled, photon triplets and non-diffracting heralded single photons. We will focus mainly on the last of these topics.
DOI
10.1109/phosst.2013.6614470

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We demonstrate the generation of non-diffracting heralded single photons, i.e. which are characterized by a single-photon transverse intensity distribution which remains essentially unchanged over a significant propagation distance. For this purpose we have relied on the process of spontaneous parametric downconversion (SPDC) for the generation of signal and idler photon pairs, where our SPDC crystal is pumped by a Bessel-Gauss (BG) beam. Our experiment shows that the well-understood non-diffracting behavior of a BG beam may be directly mapped to the signal-mode, single photons heralded by the detection of a single idler photon. In our experiment, the heralded single photon is thus arranged to be non-diffracting without the need for projecting its single-photon transverse amplitude, post-generation, in any manner.
Integrated micro- and nano-structures allows for the efficient generation of photon pairs via parametric fluorescence, thanks to the enhancement of the light-matter interaction associated with light confinement in small volumes. For instance, the efficiency of spontaneous four wave mixing in a silicon micro ring resonator can range up to 10 orders of magnitude larger than in bulk silicon. Yet the advantages of using integrated devices go well beyond the sole efficiency improvement, for micro structures grant an unprecedented control over the properties of generated non-classical light. For instance, in a single photonic integrated circuit, one can exploit the interferences of many optical elements to construct complex multipartite states in a compact, stable, and scalable system. In this talk I will focus on the generation of photon pairs and show how their spectral properties can be engineered in an integrated device for use as building blocks in the construction of a whole variety of states, from heralded single-photons to multipartite states.