Propagation-induced revival of entanglement in the angle-OAM bases

Abhinandan Bhattacharjee, Mritunjay Kumar Joshi, Suman Karan, Jonathan Leach, Anand K. Jha

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)
24 Downloads (Pure)

Abstract

Although the continuous-variable position-momentum entanglement of photon pairs produced by parametric down-conversion has applicability in several quantum information applications, it is not suitable for applications involving long-distance propagation. This is because entanglement in the position-momentum bases, as seen through Einstein-Podolsky-Rosen (EPR)–correlation measurements, decays very rapidly with photons propagating away from the source. In contrast, in this article, we show that in the continuous-variable bases of angle–orbital angular momentum (OAM), the entanglement, as seen through EPR-correlation measurements, exhibits a remarkably different behavior. As with the position-momentum bases, initially, the entanglement in the angle-OAM bases also decays with propagation, and after a few centimeters of propagation, there is no angle-OAM entanglement left. However, as the photons continue to travel further away from the source, the entanglement in the angle-OAM bases revives. We theoretically and experimentally demonstrate this behavior and show that angle-OAM entanglement revives even in the presence of strong turbulence.
Original languageEnglish
Article numbereabn7876
JournalScience Advances
Volume8
Issue number31
DOIs
Publication statusPublished - 5 Aug 2022

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