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On-demand generation of background-free single photons from a solid-state source
KTH, School of Engineering Sciences (SCI), Applied Physics, Quantum and Biophotonics.
KTH, School of Engineering Sciences (SCI), Applied Physics, Quantum and Biophotonics.
KTH, School of Engineering Sciences (SCI), Applied Physics, Quantum and Biophotonics.
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2018 (English)In: Applied Physics Letters, ISSN 0003-6951, E-ISSN 1077-3118, Vol. 112, no 9, article id 093106Article in journal (Refereed) Published
Abstract [en]

True on-demand high-repetition-rate single-photon sources are highly sought after for quantum information processing applications. However, any coherently driven two-level quantum system suffers from a finite re-excitation probability under pulsed excitation, causing undesirable multi-photon emission. Here, we present a solid-state source of on-demand single photons yielding a raw second-order coherence of g((2)) (0) = (7.5 +/- 1.6) x 10(-5) without any background subtraction or data processing. To this date, this is the lowest value of g((2)) (0) Peported for any single-photon source even compared to the previously reported best background subtracted values. We achieve this result on GaAs/AlGaAs quantum dots embedded in a low-Q planar cavity by employing (i) a two-photon excitation process and (ii) a filtering and detection setup featuring two superconducting single-photon detectors with ultralow dark-count rates of (0.0056 +/- 0.0007) s(-1) and (0.017 +/- 0.001) s(-1), respectively. Re-excitation processes are dramatically suppressed by (i), while (ii) removes false coincidences resulting in a negligibly low noise floor.

Place, publisher, year, edition, pages
American Institute of Physics (AIP), 2018. Vol. 112, no 9, article id 093106
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:kth:diva-225217DOI: 10.1063/1.5020038ISI: 000427022500038Scopus ID: 2-s2.0-85042689547OAI: oai:DiVA.org:kth-225217DiVA, id: diva2:1194871
Funder
Swedish Research Council, 638-2013-7152EU, European Research Council, 679183; 307687
Note

QC 20180404

Available from: 2018-04-04 Created: 2018-04-04 Last updated: 2018-04-04Bibliographically approved

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Lettner, ThomasZwiller, Val

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Schweickert, LucasJöns, Klaus D.Zeuner, Katharina D.Lettner, ThomasZichi, JulienTrotta, RinaldoZwiller, Val
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