A deterministic source of indistinguishable photons in a cluster state

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. F...

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Bibliographic Details
Published inarXiv.org
Main Authors Cogan, Dan, Zu-En Su, Oded, Kenneth, Gershoni, David
Format Paper
LanguageEnglish
Published Ithaca Cornell University Library, arXiv.org 12.10.2021
Subjects
Clusters
Entanglement
Field strength
Optical pulses
Photons
Quantum dots
Redundancy
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Summary: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.
ISSN:2331-8422