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Q: Fachverband Quantenoptik und Photonik

Q 57: Quantum Information (Quantum Repeater)

Q 57.1: Gruppenbericht

Freitag, 13. März 2020, 11:00–11:30, e001

Resource Efficient One-way Quantum Repeater — •Tim Schröder — Humboldt-Universität zu Berlin — Ferdinand-Braun-Institut, Berlin

Towards the realisation of a `one-way' quantum repeater, we show progress on theoretical concepts and experimental implementation. While to date `one-way' quantum repeater proposals rely on a relatively large number of stationary and flying qubit resources, we introduce a scheme that is based on photonic tree cluster states and that requires only one single photon emitter and two ancilla qubits per communication node, reducing the resource requirements by orders of magnitude. We analyse achievable quantum communication rates for different repeater parameters, and simulate that about 70 kHz quantum bit rate over a distance of 1000 km can be achieved. Moreover, we show that the implementation of such a quantum repeater is almost accessible with today's technology, and we introduce physical modules that allow for its experimental realisation. Towards the implementation of such modules we show our experimental progress with spin-photon interfaces based on defect centres in diamond nanostructures.