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Q: Fachverband Quantenoptik und Photonik

Q 48: Quantum Information (Quantum Communication and Quantum Repeater) II

Q 48.4: Vortrag

Donnerstag, 12. März 2020, 15:00–15:15, e001

Quantum teleportation using highly coherent emission from telecom C-band quantum dots — •Tina Mueller¹, Matthew Anderson^1,2, Joanna Skiba-Szymanska¹, Andrey Krysa³, Jan Huwer¹, Mark Stevenson¹, Jon Heffernan⁴, David Ritchie², and Andrew Shields¹ — ¹208 Science Park, Milton Road, Cambridge CB4 0GZ, UK — ²Cavendish Laboratory, University of Cambridge, Cambridge CB3 0HE, UK — ³EPSRC National Epitaxy Facility, University of Sheffield, Sheffield S1 3JD, UK — ⁴Department of Electronic and Electrical Engineering, University of Sheffield, Sheffield, S1 3JD, UK

Quantum network technologies rely on interference of indistinguishable photons, demanding sources of highly coherent single photons, with ideal wavelength around 1550 nm for fibre-based applications. Recently, emission of single and entangled photons from semiconductor sources in that band has been reported, but demonstration of sufficiently long coherence times has been outstanding. We show that InAs/InP quantum dots emitting in the telecom C-band can provide photons with coherence times exceeding 1 ns. These values enable near-optimal interference of quantum dot emission with a C-band laser qubit. Using entangled photons we further demonstrate teleportation of such qubits with a fidelity reaching 83.6(2.2)%.