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

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

Research output: Contribution to journalArticle

Abstract

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 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.

Original languageEnglish
Article number8955
JournalNature Communications
Volume6
DOIs
Publication statusPublished - 24 Nov 2015

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Quantum Dots
Bins
Photons
Semiconductor quantum dots
quantum dots
interference
Wavelength
photons
wavelengths
Communication
coding
communication
Quantum communication
solid state
Optical Fibers
quantum communication
Long-Term Memory
Depolarization
depolarization
Light sources

ASJC Scopus subject areas

  • Biochemistry, Genetics and Molecular Biology(all)
  • Chemistry(all)
  • Physics and Astronomy(all)

Cite this

Yu, Leo ; Natarajan, Chandra M. ; Horikiri, Tomoyuki ; Langrock, Carsten ; Pelc, Jason S. ; Tanner, Michael G. ; Abe, Eisuke ; Maier, Sebastian ; Schneider, Christian ; Höfling, Sven ; Kamp, Martin ; Hadfield, Robert H ; Fejer, Martin M. ; Yamamoto, Yoshihisa. / Two-photon interference at telecom wavelengths for time-bin-encoded single photons from quantum-dot spin qubits. In: Nature Communications. 2015 ; Vol. 6.
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abstract = "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 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.",
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Yu, L, Natarajan, CM, Horikiri, T, Langrock, C, Pelc, JS, Tanner, MG, Abe, E, Maier, S, Schneider, C, Höfling, S, Kamp, M, Hadfield, RH, Fejer, MM & Yamamoto, Y 2015, 'Two-photon interference at telecom wavelengths for time-bin-encoded single photons from quantum-dot spin qubits', Nature Communications, vol. 6, 8955. https://doi.org/10.1038/ncomms9955

Two-photon interference at telecom wavelengths for time-bin-encoded single photons from quantum-dot spin qubits. / Yu, Leo; Natarajan, Chandra M.; Horikiri, Tomoyuki; Langrock, Carsten; Pelc, Jason S.; Tanner, Michael G.; Abe, Eisuke; Maier, Sebastian; Schneider, Christian; Höfling, Sven; Kamp, Martin; Hadfield, Robert H; Fejer, Martin M.; Yamamoto, Yoshihisa.

In: Nature Communications, Vol. 6, 8955, 24.11.2015.

Research output: Contribution to journalArticle

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AU - Pelc, Jason S.

AU - Tanner, Michael G.

AU - Abe, Eisuke

AU - Maier, Sebastian

AU - Schneider, Christian

AU - Höfling, Sven

AU - Kamp, Martin

AU - Hadfield, Robert H

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AU - Yamamoto, Yoshihisa

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