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Current Affairs Yearbook 2020 for UPSC PSC Exams
Current Affairs Yearbook 2020 Useful for UPSC & PSC Exams
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UPSC Civil Services Preliminary Exam 2020 – 60 Days Revision
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Quantum Dots
- Quantum dots (QDs) are man-made nanoscale crystals that that can transport electrons.
- When UV light hits these semiconducting nanoparticles, they can emit light of various colors.
- These artificial semiconductor nanoparticles that have found applications in composites, solar cells and fluorescent biological labels.
- Electrons orbit the center of a single quantum dot similar to the way they orbit atoms, the charged particles can only occupy specific permitted energy levels.
- At each energy level, an electron can occupy a range of possible positions in the dot, tracing out an orbit whose shape is determined by the rules of quantum theory.
- A pair of coupled quantum dots can share an electron between them, forming a qubit.
- Researchers at the National Institute of Standards and Technology (NIST) have for the first time created and imaged a novel pair of quantum dots.
- These are tiny islands of confined electric charge that act like interacting artificial atoms.
- Such “coupled” quantum dots could serve as a robust quantum bit, or qubit, the fundamental unit of information for a quantum computer.
- Moreover, the patterns of electric charge in the island can’t be fully explained by current models of quantum physics, offering an opportunity to investigate rich new physical phenomena in materials.
- They could perform much larger, more complex operations than classical bits and have the potential to revolutionize computing.