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India's Quantum connects, from 1924 (Times of India)

4/19/2024

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The relationship between Bose's work, Bose Einstein Statistics and quantum computing is a fascinating one. I haven't explored it in much detail, but certainly a relevant topic as we rush headlong into the brave new world of quantum computational breakthroughs. Comment in the comment section below if you you have reaction, thoughts or suggestions on this fascinating topic! (SN Bose Project)

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Ajai Chowdhry / TNN / Apr 19, 2024
The story of quantum computing is intricately linked to India. It can be traced back to the legacy of Satyendra Nath Bose, the Indian theoretical physicist renowned for his work on quantum mechanics, and pioneer of quantum statistics and condensed matter physics. He wrote the last of the four publications that led to the foundation of quantum mechanics.

​His paper was published in 1924. S N Bose National Centre for Basic Sciences in Kolkata is celebrating 100 years of publication of Bose’s paper. What a charming coincidence that a century later, the world’s greatest tech companies are vying for a share of the quantum computing pie, and nations are evolving strategies for quantum technologies!


Grover’s algorithm: Another major contribution came from the work of Lov Kumar Grover, an Indian-American computer scientist. He is credited as the creator of the Grover database search algorithm, a pivotal advancement in quantum computing. Grover’s algorithm, introduced in 1996, gained widespread recognition as the second major algorithm proposed for quantum computing.
​

What’s quantum: Quantum computing leverages principles from quantum mechanics to resolve intricate problems at accelerated rates, as compared to classical computers. Both hardware research and application development play crucial roles in quantum computing.
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Bose-Einstein Condensate: The fifth state of matter

3/31/2024

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By Jesse Emspak Contributions from Tia Ghose, March 28, 2924. Livescience.com
A Bose-Einstein condensate is a strange form of matter in which extremely cold atoms demonstrate collective behavior and act like a single "super atom."
PictureIn the 1920s, Satyendra Nath Bose and Albert Einstein first conceived of a strange form of matter in which individual atoms clump together and behave like a single super atom. But scientists Eric A. Cornell and Carl E. Wieman only demonstrated it seven decades later, in ultracold rubidium atoms. Here, a series of images show, from left to right, increasing density as those rubidium atoms begin to form a BEC. (Image credit: NIST/JILA/CU-Boulder - NIST Image)
The Bose-Einstein condensate (BEC) is one of the five primary states of matter. In it, atoms reach such low energies that the rules of quantum mechanics dictate that they stop acting as individual atoms and behave like a single "super atom."

A Bose-Einstein condensate forms only when materials are cooled to within a hair of absolute zero. At that temperature the atoms are hardly moving relative to each other; they have almost no free energy to do so. The atoms then begin to clump together, and enter the same energy states. They become identical, from a physical point of view, and the whole group starts behaving as though it were a single atom.  

Gases, liquids, solids and plasmas have been studied for decades, if not centuries, but Bose-Einstein condensates weren't created in the laboratory until the 1990s. To make a Bose-Einstein condensate, you start with a cloud of diffuse gas. Many experiments start with atoms of rubidium. Then you cool it with lasers, using the beams to take energy away from the atoms. After that, to cool them further, scientists use evaporative cooling. 

"With a [Bose-Einstein condensate], you start from a disordered state, where kinetic energy is greater than potential energy," Xuedong Hu, a professor of physics at the University at Buffalo, told Live Science. "You cool it down, but it doesn't form a lattice like a solid." 

Instead, the atoms fall into the same quantum states, and can't be distinguished from one another. At that point the atoms start obeying what are called Bose-Einstein statistics, which are usually applied to particles you can't tell apart, such as photons, or light packets. 

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Inside the 20-year quest to unravel the bizarre realm of 'quantum superchemistry'

3/29/2024

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By Sam Lemonick, March 29, 2024, LiveScience.com
More than two decades ago, scientists predicted that at ultra-low temperatures, many atoms could undergo 'quantum superchemistry' and chemically react as one. They've finally shown it's real.
Chemistry depends on heat.

Atoms or molecules bounce around randomly, collide, and form other molecules. At higher temperatures, atoms collide more and the rate at which atoms become molecules increases. Below a certain temperature, the reaction won't happen at all.

But something very weird happens at the lowest temperatures. In this extreme cold, there is essentially no heat energy, yet chemical reactions happen faster than they do at high temperatures.


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Quantum superchemistry is a strange phenomenon in which particles undergo collective chemical reactions. It was finally demonstrated in 2023, when ultra-cold cesium atoms were converted to cesium molecules, and then back again. (Image credit: koto_feja via Getty Images)
And it was finally demonstrated last year, more than 20 years after physicists first proposed it.

In that experiment, University of Chicago physicist Cheng Chin and colleagues coaxed a group of cesium atoms at just a few nanokelvin into the same quantum state. Amazingly, each atom did not interact separately. Instead, 100,000 atoms reacted as one, almost instantaneously.


The first demonstration of this weird process has opened a window for scientists to better understand how chemical reactions operate in the strange realm of quantum mechanics, which governs the behavior of subatomic particles. It also may help to simulate quantum phenomena that classic computers struggle to model accurately, such as superconductivity.

But what happens after that, as with so many advances in research, is hard to predict. Chin, for one, has no plans to stop studying this strange form of chemistry
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    • Dear Master the Movie
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  • Guest Writers
    • Ranadhir Mitra >
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    • 27Mar24 - Ohio State >
      • Ohio State U Flyer
  • About
    • SN Bose Resources
    • Copyright Permission
  • Falguni Sarkar