Quantum technology's future rests on the exploitation of fascinating quantum mechanics concepts—such as high-dimensional quantum states. Think of these states as basic ingredients of quantum information science and quantum tech. To manipulate these states, scientists have turned to light, specifically a property called orbital angular momentum (OAM), which deals with how light twists and turns in space. Here's a catch: making super bright single photons with OAM in a deterministic fashion has been a tough nut to crack.
, tiny particles with big potential. A team of researchers from Sapienza University of Rome, Paris-Saclay University, and University of Naples Federico II combined the features of OAM with those of QDs to create a bridge between two cutting-edge technologies.So, where is the innovation? This bridge they've built can be flexibly used for two goals. First, it can make pure single photons that are entangled within the OAM-polarization space, and the researchers can count them directly.
Conceptual scheme of the proposed protocol. Manipulating the polarization and OAM of single photons generated from a QD source in a nearly deterministic fashion, intraparticle entangled states are generated by making the two degrees of freedom interact through a q-plate. In the interparticle regime, two photons characterized by specific states in the hybrid space composed of polarization and OAM interfere using a beam-splitter.
On the other hand, the team also employs the concept of indistinguishability within single photons as a resource to generate pairs of single photons that possess entanglement within the hybrid OAM-polarization space.
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