25.06.19 - Stephan Welte "Quantum information processing with photons and neutral atoms"
| When |
Jun 25, 2019
from 06:00 PM to 07:00 PM |
|---|---|
| Where | Physics high rise, Hermann Herder Str. 3, HS II |
| Contact Name | Simone Ortolf |
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Quantum information processing with photons and neutral atoms
Cavity QED systems constitute an ideal interface to connect flying and stationary qubits in a future quantum network. The stationary qubits can be realized with trapped neutral atoms while the 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 one or two atoms in a cavity to implement useful tools for quantum information processing in a network-ready architecture. These tools comprise a photon-photon quantum gate mediated by an intra-cavity atom and a gate between two atoms in one cavity executed via the reflection of a photon.
Furthermore, a probabilistic and heralded protocol to entangle two intra-cavity atoms via the reflection of weak coherent pulses will be presented. The atom-cavity system also 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.
