Researchers at the Joint Quantum Institute (JQI) have developed a new method to create entangled photons using quantum dots. By applying a laser to the quantum dot, they were able to create a biexciton that decays into two entangled photons. This method could lead to more compact and convenient sources of entangled photon pairs for quantum information applications.
The key innovation was using a laser to adjust the energy levels in the quantum dot, making the two decay pathways indistinguishable. This allowed the creation of entangled photons from individual quantum dots, rather than relying on accidental imperfections in the dots.
The technique could potentially offer advantages over traditional crystal-based methods, as quantum dots are less bulky and can produce one pair of entangled photons at a time. However, the dots must be cooled to cryogenic temperatures for the process to work.
Source: https://www.nist.gov/news-events/news/2009/11/jqi-researchers-create-entangled-photons-quantum-dots
Keywords: Quantum, Photon, Entanglement
