Erlangen 2022 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 28: Quantum Information (Quantum Communication) I

Q 28.3: Talk

Wednesday, March 16, 2022, 11:00–11:15, Q-H12

Improved Bell-state Measurements with Linear Optics — •Matthias Bayerbach, Simone d’Aurelio, and Stefanie Barz — Institute for Functional Matter and Quantum Technologies & IQST, University of Stuttgart, 70569 Stuttgart, Germany

Bell-state measurements play a key role in many quantum communication and computing applications like quantum repeaters or measurement-device-independent quantum key distribution. Standard Bell-state measurements using linear optics, however, can only distinguish two of the four Bell states, limiting the efficiency of all applications to 50 %. In this talk, we present the realization of a scheme [1], which can distinguish Bell states with more than 50 % success probably by utilising interference between the Bell state and an ancillary N00N state in a linear-optical circuit. Measuring the photon-number distribution of the output allows then identifying the respective Bell state.

[1] F. Ewert and P. van Loock, Phys. Rev. Lett. 113, 140403 (2014)