2013/08/21 by Markus Müller, S. Bounouar, Samir Bounouar +3 · 3 citations
Computer Science · Physics and Astronomy · #Biexciton #Photon #Photon entanglement #Physics #Quantum #Quantum Information and Cryptography #Quantum dot #Quantum entanglement #Quantum information science #Quantum mechanics #Quantum network #Quantum optics and atomic interactions #Quantum teleportation #Qubit #Semiconductor Quantum Structures and Devices #Spontaneous parametric down-conversion #W state #cond-mat.mes-hall #quant-ph
paper · pdf · doi:10.1038/nphoton.2013.377
9 pages, 10 figures, 2 tables
arxiv created 2013/08/21 · openalex publication_date 2014/02/14 · arxiv updated 2015/06/16 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
An on-demand source of indistinguishable and entangled photon pairs is a fundamental component for different quantum information applications such as optical quantum computing, quantum repeaters, quantum teleportation and quantum communication. Parametric down-conversion and four-wave mixing sources of entangled photons have shown high degrees of entanglement and indistinguishability but the probabilistic nature of their generation process also creates zero or multiple photon pairs following a Poissonian distribution. This limits their use in complex algorithms where many qubits and gate operations are required. Here we show simultaneously ultra-high purity (g^(2)(0) < 0.004), high entanglement fidelity (0.81 +/- 0.02), high two-photon interference non-post selective visibilities (0.86 +/- 0.03 and 0.71 +/- 0.04) and on-demand generation of polarization-entangled photon pairs from a single semiconductor quantum dot. Through a two-photon resonant excitation scheme, the biexciton population is deterministically prepared by a Pi-pulse. Applied on a quantum dot showing no exciton fine structure splitting, this results in the deterministic generation of indistinguishable entangled photon pairs.