Boson or Fermion? Quantum Confusion with Cavity Photons

Date: 24 February 2017
Speaker: Axel Kuhn (Oxford)

We demonstrate quantum logic and quantum feedback using narrow linewidth photons that are produced with an a-priory non-probabilistic scheme from a single atom strongly coupled to a high-finesse cavity [1]. We use a controlled-NOT gate integrated into a photonic chip to entangle these photons [2], and we observe non-classical correlations between photon detection events separated by periods exceeding the travel time across the chip by three orders of magnitude. Furthermore we apply a quantum-feedback scheme in a two-photon interference setting that allows deliberate switching between bosonic and fermionic photon behaviour [3].

[1] A. Kuhn, Cavity Induced Interfacing of Atoms and Light, in Engineering the Atom-Photon Interaction, Springer (2015)
[2] A. Holleczek et al., Phys. Rev. Lett. 117, 023602 (2016)
[3] O. Barter et al., in preparation