Rostock 2019 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 41: Poster: Quantum Optics and Photonics II
Q 41.43: Poster
Mittwoch, 13. März 2019, 16:15–18:15, S Fobau Physik
A heralded single-photon time-bin qubit source — •Stefan Zeppetzauer1, Maxime Jacquet1, Lee Rozema2, Michal Vyvlecka1, Marie-Christine Röhsner1, and Peter Schiansky2 — 1Faculty of Physics, University of Vienna, Vienna, Austria — 2Vienna Center for Quantum Science and Technology (VCQ), Faculty of Physics, University of Vienna, Vienna, Austria
Classical networks are able to transmit information over the whole world, while most quantum communication experiments are still limited to short distances between participating parties. In order to realize large-scale quantum networks the transmission of correlated states over long distances is an important requirement. Single photons are ideally suited to encode these states due to their inherent mobility and long coherence times. However, while encoding qubits in the polarisation state allows efficient manipulation, they suffer from dispersion and other decoherence effects. These problems can be circumvented by using time-bin qubits which encode a quantum state as a superposition of arrival times. Unfortunately, a common problem in time-bin sources is the need for postselection which opens up means of attack for a potential eavesdropper. In our work we show a source of heralded single-photon time-bin qubits without the need for postselection. This is achieved by combining a source of polarization entangled photons with an unbalanced Michelson interferometer to convert the qubits from polarization to time-bin. We characterize the time-bin qubits via quantum state tomography in the energy-time basis and give an outlook on how the setup will be used for feed-forward and hyper-entanglement protocols.