Large-range frequency tuning of a narrow-linewidth quantum emitter
Sprache des Titels:
Englisch
Original Kurzfassung:
A hybrid system of a semiconductor quantum dot single photon source and a rubidium quantum memory represents a promising
architecture for future photonic quantum repeaters. One of the key challenges lies in matching the emission frequency of quantum dots with
the transition frequency of rubidium atoms while preserving the relevant emission properties. Here, we demonstrate the bidirectional
frequency tuning of the emission from a narrow-linewidth (close-to-transform-limited) quantum dot. The frequency tuning is based on a
piezoelectric strain-amplification device, which can apply significant stress to thick bulk samples. The induced strain shifts the emission frequency
of the quantum dot over a total range of 1.15 THz, about three orders of magnitude larger than its linewidth. Throughout the whole
tuning process, both the spectral properties of the quantum dot and its single-photon emission characteristics are preserved. Our results
show that external stress can be used as a promising tool for reversible frequency tuning of high-quality quantum dots and pave the wave
toward the realization of a quantum dot?rubidium atom interface for quantum networking.
Forschungs-