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Quantum information processing with photons and neutral atoms

November 29, 2018 - 11:00am
Stephan Welte
Max Planck Institute for Quantum Optics, Garching, Germany

Cavity QED systems constitute an ideal interface to connect flying and stationary qubits in a future quantum network. In this presentation, stationary qubits are realized with trapped neutral atoms while flying qubits are encoded either in the polarization degree of a photon or in the phase of a coherent laser pulse. I will present a series of experiments employing the strong nonlinearity provided by an atom-cavity system to implement fundamental building blocks for quantum information processing in a network-ready architecture. These experiments comprise a photon-photon quantum gate and a gate between two atoms in one cavity. Furthermore, a probabilistic and heralded protocol to entangle two intra-cavity atoms will be introduced. Lastly, the atom-cavity system allows for the deterministic generation of entangled atom-light Schrödinger-cat states. I will present the generation and manipulation of these states as well as their potential for hybrid quantum information processing between discrete and continuous variables.

PSC 2136