Rostock 2019 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 41: Poster: Quantum Optics and Photonics II
Q 41.14: Poster
Mittwoch, 13. März 2019, 16:15–18:15, S Fobau Physik
Opto-electronic switch for fast error-correction in blind quantum computation — •Marco Marcozzi1,2, Michal Vyvlecka1, Alessandro Trenti1, and Philip Walther1 — 1Faculty of Physics, University of Vienna, Boltzmanngasse 5, 1090 Vienna, Austria — 2School of Science and Technology, Physics Division, University of Camerino, I-62032 Camerino (MC), Italy
One-way quantum computing allows to implement arbitrary quantum computation using only sequential single-qubit measurements with classical feed forward of their outcomes in implementing quantum gates. To control the correctness of the algorithm fast error-correction heralded by classical feed forward is crucial. Furthermore, this scheme also enables the implementation of blind quantum computation (BQC), where a random measurement basis is used to encrypt hidden computation. In our experiment we implement classical feed forward to run a BQC protocol on a four-photon cluster state using a Pockels cell driven by a field programmable gate array (FPGA). Coincidence measurement on the first three qubits is used to activate a Pockels cell which controls the state of the fourth photon. The outcome is feed forwarded to the polarization-flipping stage. To synchronize this process the fourth photon has to be delayed. To allow for a fast computation and to minimize losses low switching times are required. We are able to achieve this fast error-correction because a Pockels cell is a very fast optical switch and FPGAs can parallelize processes, so that it takes only one clock cycle to achieve different tasks simultaneously.