2014/03/31 by Yong-Heng Huo, Léonard Monniello, Vlastimil Křápek +8 · 1 citation
Engineering · Materials Science · Physics and Astronomy · #Quantum Dots Synthesis And Properties #Semiconductor Lasers and Optical Devices #Semiconductor Quantum Structures and Devices #cond-mat.mes-hall
paper · pdf · doi:10.1103/physrevb.90.041304
5 pages, 4 figures
arxiv created 2014/03/31 · openalex publication_date 2014/07/30 · arxiv updated 2014/09/02 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
We report on two-photon interferences from highly indistinguishable single photons emitted by a quantum dot. Stricly resonant excitation with picosecond laser pulses allows coherent state preparation with a signifi- cantly increased coherence time (T2 ∼ 1 ns) and reduced lifetime (T1 ∼ 650 ps), as compared to a non-resonant excitation scheme. Building-up the Hong-Ou-Mandel dip without post-selection of the interfering photons, visi- bilities greater than 70 % have been observed. Near-unity indistinguishable photons could be achieved for every dot if charge noise is controlled. Indeed, the remaining decoherence mechanism is likely due to the fluctuating electrostatic environment of the dots.