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...

Full description

Saved in:
Bibliographic Details
Main Authors Cogan, Dan, Su, Zu-En, Kenneth, Oded, Gershoni, David
Format Journal Article
LanguageEnglish
Published 12.10.2021
Subjects
Physics - Optics
Physics - Quantum Physics
Online AccessGet full text

Cover

More Information
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.
DOI:10.48550/arxiv.2110.05908