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Conference on Lasers and Electro-Optics

On-Demand Generation of Entangled Multiphoton States

Ido Schwartz, Dan Cogan, Emma Schmidgall, Yaroslav Don, Liron Gantz, Netanel H. Lindner, D. Gershoni

Published Jan 1, 2016• 0 citations
Publisher

Abstract

We demonstrate gigahertz rate, deterministic generation of long strings of polarization-enetangled photons and photonic cluster states. We use repeated timed excitation of a semiconductor quantum dot-confined dark exciton, which entangles the sequentially emitted photons.
DOI
10.1364/cleo_qels.2016.ftu1c.1

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Measurement-based quantum communication relies on the availability of highly entangled multi-photon cluster states. The inbuilt redundancy in the cluster allows communication between remote nodes using repeated local measurements, compensating for photon losses and probabilistic Bell-measurements. For feasible applications, the cluster generation should be fast, deterministic, and its photons - indistinguishable. We present a novel source based on a semiconductor quantum-dot device. The dot confines a heavy-hole, precessing in a finely tuned external weak magnetic field while periodically excited by a sequence of optical pulses. Consequently, the dot emits indistinguishable polarization-entangled photons, where the field strength optimizes the entanglement. We demonstrate Gigahertz rate deterministic generation of >90% indistinguishable photons in a cluster state with more than 10 photons characteristic entanglement-length.