Highly photostable Zn-treated halide perovskite nanocrystals for efficient single photon generation

TL;DR

This paper reports on Zn-treated CsPbBr3 nanocrystals that exhibit enhanced stability, high single-photon purity, and reduced blinking, making them promising candidates for quantum technology applications.

Contribution

The study introduces a Zn-doping method to improve the stability and optical performance of lead halide perovskite nanocrystals for single-photon emission.

Findings

Enhanced stability under dilution and illumination.

High single-photon purity achieved.

Reduced blinking on sub-millisecond timescale.

Abstract

Achieving pure single-photon emission is essential for a range of quantum technologies, from optical quantum computing to quantum key distribution to quantum metrology. Among solid-state quantum emitters, colloidal lead halide perovskite (LHP) nanocrystals (NCs) have garnered significant attention due to their interesting structural and optical properties, which make them appealing single-photon sources (SPSs). However, their practical utilization for quantum technology applications has been hampered by environment-induced instabilities. In this study, we fabricate and characterize in a systematic manner Zn-treated $CsPbBr_3$ colloidal NCs obtained through $Zn^{2+}$ ion doping at the Pb-site, demonstrating improved stability under dilution and illumination. These doped NCs exhibit high single-photon purity, reduced blinking on a sub-millisecond timescale and stability of the bright state for excitation powers well above the saturation levels. Our findings highlight the potential of this synthesis approach to optimize the performance of LHP-based SPSs, opening up interesting prospects for their integration into nanophotonic systems for quantum technology applications.