Regensburg 2022 – scientific programme

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QI: Fachverband Quanteninformation

QI 6: Quantum Information: Concepts and Methods

QI 6.7: Talk

Tuesday, September 6, 2022, 11:30–11:45, H9

Improved Bell state measurement — •Simone D'Aurelio, Matthias Bayerbach, and Stefanie Barz — Institute for Functional Matter and Quantum Technologies & IQST, University of Stuttgart, 70569 Stuttgart, Germany

Bell-state measurements play an important role in many quantum tech- nologies, e.g. in quantum repeaters, certain quantum communication protocols and photonic quantum computing. However, using linear- optics only, such a Bell-state measurement has a success probability of 50%. Here, we show the implementation of a novel scheme that allows overcoming this limit.

We give details on the experimental setup. We show how we gen- erate Bell-states in a linear Mach-Zehnder-like scheme as well as how we create ancilliary N00N states from single photons. Both states in- terfere in a linear-optical setup and photon-number measurements at the output allow determining the respective Bell state.