Nanocrystal qubits manipulation using near field ultrafast pulsed laser

Advisor: Yehonadav Bekenstein

Contact: Vebernoam@campus.technion.ac.il

Abstract:

Qubits are quantum mechanical two level system that can be used for quantum technologies.

Perovskites nanocrystals (NC) stand out as new materials with favorable optoelectronic properties such as strong quantum confinement and fast lifetimes of excitons.

Such physical properties are of great importance for implementation of future quantum technologies.

In this research, we aim to demonstrate the use of a single nanocrystals as a two-level system that can be manipulated in a discreet manner between these states, which is a first step for building a qubit. To achieve this, we use a special atomic force microscope (AFM), which is coupled to a pulsed laser beam focused on the apex of an AFM tip [Scanning near field optical microscopy (SNOM)]. This causes field enhancement concentrated to about a 10 nm radius, which allows the investigation of single NCs using optical light, thus breaking the diffraction limit. By measuring a current between the tip and the sample we acquire information about the charging states of the NC enabling a basic implementation of a two-level quantum system.

Pre-requisites: quantum mechanics