Journal
PHYSICAL REVIEW APPLIED
Volume 8, Issue 1, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevApplied.8.014013
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Funding
- UK EPSRC
- Innovate UK [102245, EP/M013472/1]
- Engineering and Physical Sciences Research Council [EP/M508275/1] Funding Source: researchfish
- EPSRC [EP/M508275/1, EP/M508263/1, EP/M013472/1] Funding Source: UKRI
- Innovate UK [102245] Funding Source: UKRI
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Efficient sources of individual pairs of entangled photons are required for quantum networks to operate using fiber-optic infrastructure. Entangled light can be generated by quantum dots (QDs) with naturally small fine-structure splitting (FSS) between exciton eigenstates. Moreover, QDs can be engineered to emit at standard telecom wavelengths. To achieve sufficient signal intensity for applications, QDs have been incorporated into one-dimensional optical microcavities. However, combining these properties in a single device has so far proved elusive. Here, we introduce a growth strategy to realize QDs with small FSS in the conventional telecom band, and within an optical cavity. Our approach employs droplet-epitaxy'' of InAs quantum dots on (001) substrates. We show the scheme improves the symmetry of the dots by 72%. Furthermore, our technique is universal, and produces low FSS QDs by molecular beam epitaxy on GaAs emitting at similar to 900 nm, and metal-organic vapor-phase epitaxy on InP emitting at similar to 1550 nm, with mean FSS 4x smaller than for Stranski-Krastanow QDs.
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