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  • Institute for Quantum Computing

    Entangled Photon Orbital Angular Momentum Arrays

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    communication degrees of freedom grand challenge light OAM optical structures periodicity photons remote state preparation Talbot effect

    Summary

    Arrays of orbital angular momentum (OAM) states of light are a new form of structured light so far relatively unexplored in quantum information science. Unlike spin angular momentum of light, which is related to light’s polarization and covers two dimensions, OAM states, sometimes described as ‘donut beams’ due to the shape of the field intensity distribution in their cross section, are in principle an infinite dimensional system and can be used to carry much more information per photon. In this project, we generate arrays of entangled orbital angular momentum beams and explore the utility of the spatially entangled photons in quantum communication protocols, such as remote state preparation. In collaboration with Dmitry Pushin, David Cory, and Thomas Jennewein, we study the propagation of entangled OAM arrays and their self-imaging capabilities known as the Talbot Effect, which hold promise for developing a new method to measure OAM. As we learn to control the spatial patterns of these light beams we expect they may find application in sensing of periodic optical structures in materials.

    Figure 1. Simulated and observed intensity distribution in orbital angular momentum arrays as they propagate over different fractional Talbot lengths

     

     

     

     

     

     

    Principal Investigator (PI) or Team Coordinator

    Kevin Resch

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