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 and Yoshihisa Yamamoto
Additional contact information
Leo Yu: E. L. Ginzton Laboratory, Stanford University
Chandra M. Natarajan: E. L. Ginzton Laboratory, Stanford University
Tomoyuki Horikiri: National Institute of Informatics
Carsten Langrock: E. L. Ginzton Laboratory, Stanford University
Jason S. Pelc: Hewlett-Packard Laboratories
Michael G. Tanner: Scottish Universities Physics Alliance (SUPA) and School of Engineering and Physical Sciences, Heriot-Watt University
Eisuke Abe: National Institute of Informatics
Sebastian Maier: Technische Physik, Physikalisches Institut and Wilhelm Conrad Röntgen-Center for Complex Material Systems, University of Würzburg, Am Hubland
Christian Schneider: Technische Physik, Physikalisches Institut and Wilhelm Conrad Röntgen-Center for Complex Material Systems, University of Würzburg, Am Hubland
Sven Höfling: Technische Physik, Physikalisches Institut and Wilhelm Conrad Röntgen-Center for Complex Material Systems, University of Würzburg, Am Hubland
Martin Kamp: Technische Physik, Physikalisches Institut and Wilhelm Conrad Röntgen-Center for Complex Material Systems, University of Würzburg, Am Hubland
Robert H. Hadfield: School of Engineering, University of Glasgow
Martin M. Fejer: E. L. Ginzton Laboratory, Stanford University
Yoshihisa Yamamoto: E. L. Ginzton Laboratory, Stanford University

Nature Communications, 2015, vol. 6, issue 1, 1-10

Abstract: 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.

Date: 2015
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DOI: 10.1038/ncomms9955

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