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

Yu, L. et al. (2015) Two-photon interference at telecom wavelengths for time-bin-encoded single photons from quantum-dot spin qubits. Nature Communications, 6, 8955. (doi: 10.1038/ncomms9955) (PMID:26597223) (PMCID:PMC4673878)

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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.

Item Type:Articles
Glasgow Author(s) Enlighten ID:Hadfield, Professor Robert and Natarajan, Dr Chandra and Tanner, Dr Michael
Authors: Yu, L., Natarajan, C. M., Horikiri, T., Langrock, C., Pelc, J. S., Tanner, M. G., Abe, E., Maier, S., Schneider, C., Höfling, S., Kamp, M., Hadfield, R. H., Fejer, M. M., and Yamamoto, Y.
College/School:College of Science and Engineering > School of Engineering > Electronics and Nanoscale Engineering
Journal Name:Nature Communications
Publisher:Nature Publishing Group
Copyright Holders:Copyright © 2015 The Authors
First Published:First published in Nature Communications 6:8955
Publisher Policy:Reproduced under a Creative Commons License

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Project CodeAward NoProject NamePrincipal InvestigatorFunder's NameFunder RefLead Dept
492622Stanford-Scotland Photonics innovation collaboration (SU2P)Sheila RowanEngineering & Physical Sciences Research Council (EPSRC)EP/G042446/1P&A - PHYSICS & ASTRONOMY