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On-demand generation of background-free single photons from a solid-state source
KTH, Skolan för teknikvetenskap (SCI), Tillämpad fysik, Kvant- och biofotonik.ORCID-id: 0000-0002-1858-007X
KTH, Skolan för teknikvetenskap (SCI), Tillämpad fysik, Kvant- och biofotonik.ORCID-id: 0000-0002-5814-7510
KTH, Skolan för teknikvetenskap (SCI), Tillämpad fysik, Kvant- och biofotonik.ORCID-id: 0000-0003-0043-2527
Vise andre og tillknytning
2018 (engelsk)Inngår i: Applied Physics Letters, ISSN 0003-6951, E-ISSN 1077-3118, Vol. 112, nr 9, artikkel-id 093106Artikkel i tidsskrift (Fagfellevurdert) 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.

sted, utgiver, år, opplag, sider
American Institute of Physics (AIP), 2018. Vol. 112, nr 9, artikkel-id 093106
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Identifikatorer
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
Forskningsfinansiär
Swedish Research Council, 638-2013-7152EU, European Research Council, 679183; 307687
Merknad

QC 20180404

Tilgjengelig fra: 2018-04-04 Laget: 2018-04-04 Sist oppdatert: 2020-01-16bibliografisk kontrollert

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Schweickert, LucasJöns, Klaus D.Zeuner, KatharinaLettner, ThomasZichi, JulienTrotta, RinaldoZwiller, Val
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