Quantum-information processing with solid-state single-photon sources (Prof. P. Lodahl)

Date: Nov 17, 2015
Time: 02:30 PM - 04:00 PM (Local Time Germany)
Speaker: Prof. Dr. Peter Lodahl, Niels Bohr Institute, University of Copenhagen, Denmark
Room: Herbert Walther Lecture Hall
Host: MPQ

We review the recent experimental progress on the use of quantum dots coupled to photonic-crystal waveguides [1].

We show that single photons can be channeled into the waveguide with an efficiency exceeding 98% [2] and discuss a how chiral photon-emission can be achieved in specifically prepared waveguides enabling construction of non-reciprocol integrated photonic devices [3]. Finally, we discuss the prospects of scaling the platform to larger quantum architectures for applications in quantum-information processing, such as efficient photon sorting [4].

References:
[1] P. Lodahl, S. Mahmoodian, and S. Stobbe, “Interfacing single photons and single quantum dots with photonic nanostructures.” Review of Modern Physics 87, 347 (2015).
[2] M. Arcari, I. Söllner, A. Javadi, S.L. Hansen, S. Mahmoodian, J. Liu, H. Thyrrestrup, E.H. Lee, J.D. Song, S. Stobbe, and P. Lodahl, “Near-unity coupling efficiency of a quantum emitter to a photonic-crystal waveguide.” Physical Review Letters 113, 093603 (2014).
[3] I. Söllner, S. Mahmoodian, S. Lindskov Hansen, L. Midolo, A. Javadi, G. Kiršanskė, T. Pregnolato, H. El-Ella, E.H. Lee, J.D. Song, S. Stobbe and P. Lodahl, “Deterministic photon-emitter coupling in chiral photonic circuits”. Nature Nanotechnology adv. online publ., DOI:10.1038/NNANO.2015.159 (2015).
[4] T.C. Ralph, I. Söllner, S. Mahmoodian, A.G. White, and P. Lodahl, ”Photon sorting, efficient Bell measurements and a deterministic CZ gate using a passive two-level nonlinearity”. Physical Review Letters 114, 173603 (2015).