MANIPULATION OF INTRA-MANIFOLD EXCITONIC ENERGY REDISTRIBUTION IN COLLOIDAL SEMICONDUCTOR NANOPLATELETS: TOWARD HIGH-TEMPERATURE QUANTUM EMITTERS
Abstract
Quantum information processing promises to revolutionize communications, computing, and encryption in the 21st century through manipulation of superpositions of quantum states called qubits. Photons, the elemental quanta of light, are ideal propagating qubits because they interact only weakly with their environments. One can therefore encode information in the quantum state of the photon using degrees of freedom such as polarization, momentum, and energy, and transport this information at the speed of light over long distances with little loss of information. Development of photonic qubits requires deterministic quantum emitters, on-demand sources of “quantum light”, by which to transmit information. Semiconductor nanocrystals meet many of the requirements of ideal quantum emitters, but a number of optical decoherence mechanisms, related to both the nanocrystal’s structure and induced by fluctuations of the environment, have hindered progress toward the synthesis of a semiconductor nanocrystal photonic qubit with a large enough ratio of optical coherence lifetime to radiative lifetime. The objective of the proposed research program is to conduct fundamental studies of intra-manifold excitonic energy redistribution in a specific type of semiconductor nanocrystal, a quasi-2D colloidal nanoplatelet, and in complexes of nanoplatelets with molecules, in order to realize single “quantum” photon emission from these particles at non-cryogenic temperatures. This work involves tuning the chemical composition of the nanoplatelets to control their exciton fine structure and dynamics through their synthesis and post-synthetic chemical functionalization, and to use time-dependent linear and interferometric spectroscopies and microscopies from 4K to room temperature, to map the chemical and electronic
Document Details
- Document Type
- DoD Grant Award
- Publication Date
- Aug 12, 2021
- Source ID
- FA95502010364
Entities
People
- Emily Weiss
Organizations
- Air Force Office of Scientific Research
- Northwestern University
- United States Air Force