On-demand room-temperature single-photon array produces precisely located photons
Previously, quantum emitters producing single photons at room temperature emitted them from random locations.
|A schematic shows a single-photon emitter array using atomically thin materials placed on nanopillars. (Image by Rezlind Bushati)|
Physicists at The City College of New York (CCNY) have used atomically thin two-dimensional materials to realize an array of on-demand quantum emitters operating at room temperature that can be integrated into next-generation quantum-communication systems.1 CCNY professors Carlos Meriles and Vinod Menon and their colleagues used hexagonal boron nitride (hBN) placed on nanopillars to demonstrate single-photon emission at the pillar locations.
In simplest terms, the breakthrough allows one to know where the single-photon emitters are located. Single-photon emitters are essential building blocks for next-generation quantum communication and computing protocols as they can be used as a quantum bit (qubit). The current breakthrough has solved a long-standing and practical hurdle of realizing deterministic single-photon emitters at room temperature. Previously, very low temperatures were necessary or the photons were hard to extract using other materials such as diamond, notes Menon. And, if single-photon emission did occur at room temperature, it happened at random locations.
The large energy gap of hBN stabilizes the emitters at room temperature within nanoscale regions created by substrate-induced deformation of the hBN. The smallest pillars, which were 75 nm in diameter, contained an average of about 2 emitters. The arrays can be manipulated via a combination of strain and external electrostatic potentials.
1. Nicholas V. Proscia et al., Optica (2018); https://doi.org/10.1364/OPTICA.5.001128.