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Two-photon interference at telecom wavelengths for time-bin-encoded single photons from quantum-dot spin qubits

Please always quote using this URN: urn:nbn:de:bvb:20-opus-138677
  • Practical quantum communication between remote quantum memories rely on single photons at telecom wavelengths. Although spin-photon entanglement has been demonstrated in atomic and solid-state qubit systems, the produced single photons at short wavelengths and with polarization encoding are not suitable for long-distance communication, because they suffer from high propagation loss and depolarization in optical fibres. Establishing entanglement between remote quantum nodes would further require the photons generated from separate nodes to bePractical quantum communication between remote quantum memories rely on single photons at telecom wavelengths. Although spin-photon entanglement has been demonstrated in atomic and solid-state qubit systems, the produced single photons at short wavelengths and with polarization encoding are not suitable for long-distance communication, because they suffer from high propagation loss and depolarization in optical fibres. Establishing entanglement between remote quantum nodes would further require the photons generated from separate nodes to be indistinguishable. Here, we report the observation of correlations between a quantum-dot spin and a telecom single photon across a 2-km fibre channel based on time-bin encoding and background-free frequency downconversion. The downconverted photon at telecom wavelengths exhibits two-photon interference with another photon from an independent source, achieving a mean wavepacket overlap of greater than 0.89 despite their original wavelength mismatch (900 and 911 nm). The quantum-networking operations that we demonstrate will enable practical communication between solid-state spin qubits across long distances.show moreshow less

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Metadaten
Author: Leo Yu, Chandra M. Natarajan, Tomoyuki Horikiri, Carsten Langrock, Jason S. Pelc, Michael G. Tanner, Eisuke Abe, Sebastian Maier, Christian Schneider, Sven Höfling, Martin Kamp, Robert H. Hadfield, Martin M. Fejer, Yoshihisa Yamamoto
URN:urn:nbn:de:bvb:20-opus-138677
Document Type:Journal article
Faculties:Fakultät für Physik und Astronomie / Physikalisches Institut
Language:English
Parent Title (English):Nature Communications
Year of Completion:2015
Volume:6
Pagenumber:8955
Source:Nature Communications 6:8955 doi: 10.1038/ncomms9955 (2015)
DOI:https://doi.org/10.1038/ncomms9955
Dewey Decimal Classification:5 Naturwissenschaften und Mathematik / 53 Physik / 539 Moderne Physik
Tag:1550 nm; atom; communication; downconversion; emission; generation; heralded entanglement; interface; up-conversion
Release Date:2016/11/02
Licence (German):License LogoCC BY: Creative-Commons-Lizenz: Namensnennung