P. Neilinger,1 S. N. Shevchenko,2, 3 J. Bogár,1 M. Rehák,1 G. Oelsner,4 D. S. Karpov,2 O. Astafiev,5, 6, 7 M. Grajcar,1, 8 and E. Il’ichev4, 9 Department of Experimental Physics, Comenius University, SK-84248 Bratislava, Slovakia B. Verkin Institute for Low Temperature Physics and Engineering, Kharkov, Ukraine V. Karazin Kharkov National University, Kharkov, Ukraine Leibniz Institute of Photoni...