Event Details

Non-locality of quantum optical fields and its application in quantum information protocols

  • 2021-12-17
  • Dr. Tamoghna Das, University of Gdansk, Poland

Violation of local realism by spatially separated quantum optical modes plays an essential role in implementing various quantum information protocols including quantum cryptography. In this talk, I will demonstrate the non-local features of a vacuum-single-photon excitation of a pair of spatially separated modes by robustly violating the Clauser-Horne inequality via weak field homodyne measurements. We prove that it is important to exploit the particle and wave aspects of the single-photon excitation as there exists a local hidden variable model for the phase-sensitive constant field homodyning. I will also describe how to quantify genuine multimode quantum entanglement in the continuous variable system by exploring the geometry of the state space for both Gaussian and non-Gaussian states. I will finally talk about the advantage of using entangled signal-idler modes in detecting a light-absorbing unknown target of low reflectivity, which is embedded in a noisy environment.