1. Electrooptical Engineering Unit, Ben-Gurion University of the Negev, Beer-Sheva 8410501, Israel
2. Ilse Katz Institute for Nanoscale Science and Technology, Ben-Gurion University of the Negev, Beer-Sheva 8410501, Israel
3. Center for Quantum Information Science and Technology, Ben-Gurion University of the Negev, Beer-Sheva 8410501, Israel
4. Photonics Research Centre, Department of Physics, Faculty of Science, University of Malaya, 50603 Kuala Lumpur, Malaysia
5. Department of Physics and Astronomy, University of Southampton, Southampton SO17 1BJ, U.K.
6. CNR-SPIN, Viale del Politecnico 1, I-00133 Rome, Italy