A source of entangled photons based on a cavity-enhanced and strain-tuned GaAs quantum dot
Sprache des Titels:
Englisch
Original Kurzfassung:
A quantum-light source that delivers photons with a high brightness and a high degree of entanglement
is fundamental for the development of efcient entanglement-based quantum-key distribution systems. Among
all possible candidates, epitaxial quantum dots are currently emerging as one of the brightest sources of highly
entangled photons. However, the optimization of both brightness and entanglement currently requires diferent
technologies that are difcult to combine in a scalable manner. In this work, we overcome this challenge
by developing a novel device consisting of a quantum dot embedded in a circular Bragg resonator, in turn, integrated
onto a micromachined piezoelectric actuator. The resonator engineers the light-matter interaction to empower
extraction efciencies up to 0.69(4). Simultaneously, the actuator manipulates strain felds that tune the quantum dot
for the generation of entangled photons with corrected fdelities to a maximally entangled state up to 0.96(1). This
hybrid technology has the potential to overcome the limitations of the key rates that plague QD-based entangled
sources for entanglement-based quantum key distribution and entanglement-based quantum networks.
Forschungs-