Hannover 2020 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 51: Quantum Optics IV
Q 51.5: Talk
Thursday, March 12, 2020, 15:00–15:15, f342
Optimizing spontaneous parametric down-conversion sources for boson sampling — •Reinier van der Meer1, Jelmer J. Renema1, Benjamin Brecht2, Christine Silberhorn2, and Pepijn W. H. Pinkse1 — 1University of Twente, Enschede, The Netherlands — 2Paderborn University, Paderborn, Germany
The next milestone in photonic quantum information processing is to demonstrate an optical experiment at which the quantum device outperforms any classical computer. This can be achieved by sending single photons through a passive linear-optical network. However, this requires the generation of many identical single photons, which is challenging to realize. Spectral impurity reduces the visibility of quantum interference of the photons, which can be mitigated by filtering at the cost of optical losses. Unfortunately, these losses are also detrimental to quantum interference.
We recently demonstrated how to analyze the role of imperfections in multiphoton interference experiments [1]. We now apply these results to the problem of constructing single-photon sources. In this work we show that an optimum exists where we can outperform a classical computer, using off-the-shelf parametric down-conversion photon sources. These results show that demonstrating a quantum advantage using photonics is difficult, but possible.
[1] J.J. Renema et al., arXiv: 1809.01953 (2018)