On-demand generation of indistinguishable polarization-entangled photon pairs
By M. Müller, S. Bounouar, K. Jöns, M. Glässl, P. Michler. Nature Photonics, 2013
412 citations recorded by the source corpus.
An on-demand source of indistinguishable and entangled photon pairs is a fundamental component of various quantum information applications, including optical quantum computing, quantum repeaters, quantum teleportation and quantum communication1. Parametric downconversion2,3 and four-wave mixing sources4 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 simultaneously show ultrahigh 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 (efficiency εpair = 0.86 ± 0.08) 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 π-pulse (εbiexciton = 0.98 ± 0.07). Applied on a quantum dot showing no exciton fine-structure splitting, this results in the deterministic generation of indistinguishable entangled photon pairs. Polarization-entangled photon pairs are generated from an In(Ga)As quantum dot by setting the pump intensity such that the inversion of the quantum dot from the ground to the biexcitonic state is the most probable transition. On-demand generation is demonstrated with an ultrahigh purity, a high entanglement fidelity and high two-photon-interference non-post-selective visibilities.
Subfields: Artificial Intelligence, Atomic and Molecular Physics, and Optics
View Paper: https://www.semanticscholar.org/paper/5157b5bc601e8d8633fe217d7a07e3f2f6c88a8e
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In Atomic and Molecular Physics, and Optics
Citations in the corpus
- Resonant dielectric nanostructures: a low-loss platform for functional nanophotonics (2016, background): “for display applications, for nearfield enhanced spectroscopy techniques, and for improving the collection efficiency of quantum-light sources [78].”