[image: image001.png] Prof. Oliver Benson Humboldt University, Berlin Seminar: Hybrid Quantum Technology Based on Quantum Emitters in Condensed Phase Wednesday, December 6, 2017 11:00 AM Haus Room, 36-428 Hosted by Dirk Englund Abstract: A quantum hybrid system can be defined as consisting of two dissimilar physical systems that share a joint quantum state. Aside from being a fundamentally interesting object, several applications such as quantum information processing (quantum computers, quantum repeaters) or quantum sensing have been suggested. Bringing two dissimilar systems in a joint quantum state can be established by entangling them with photons or surface plasmon polaritons (SPPs) followed by joint measurements. Here we provide an overview of different approaches in these directions pursued in our labs. We introduce different kinds of quantum emitters (quantum dots, defect centers in diamond, molecules) as stationary quantum systems. Photon sources as part of a quantum hybrid architecture [1,2] can provide the ‘glue’ for such dissimilar quantum systems. We report on our recent results on non-linear photon conversion to the telecom band [3], photon collection from single emitters [4], and quantum logic elements using SPPs [5]. Future directions towards a higher level of integration will be discussed. [1] “Assembly of hybrid photonic architectures from nanophotonic constituents“, O. Benson, *Nature* 480, 193-199 (2011). [2] “Bright source of indistinguishable photons based on cavity-enhanced parametric down-conversion utilizing the cluster effect”, A. Ahlrichs, O. Benson, *APL* 108, 021111 (2016). [3] “Heralded wave packet manipulation and storage of a frequency-converted pair photon at telecom wavelength”, T. Kroh, A. Ahlrichs, B. Sprenger and O. Benson, *Quant. Sci. Techn.* 2, 034007 (2017). [4] “Wiring up pre-characterized single-photon emitters by laser lithography“, Q. Shi, B. Sontheimer, N. Nikolay, A.W. Schell, J. Fischer, A. Naber, O. Benson, M. Wegener, *Sci. Rep.* 6, 31135, (2016). [5] “Design and numerical optimization of an easy-to-fabricate photon-to-plasmon coupler for quantum plasmonics“, G. Kewes, A.W. Schell, R. Henze, R.S. Schönfeld, S. Burger, K. Busch, and O. Benson, *Appl. Phys. Lett. *102, 051104 (2013). For a full listing of this semester’s colloquia or to subscribe to the mailing list, please visit www.rle.mit.edu/oqesem