Physics Association, BITS Pilani

Physics Association, BITS Pilani This page has been made with the motive of familiarizing people with recent researches and breakthroughs taking place in beautiful field of Physics.

This page is aimed at keeping you geared up with the activities of Physics association and to provide a platform for all the physics group members to share their ideas and thoughts.

All you need to know about: NASA-SPACEX CREW DRAGON LAUNCHFollow us on Instagram  for more.
09/06/2020

All you need to know about:
NASA-SPACEX CREW DRAGON LAUNCH
Follow us on Instagram for more.

Lecture Series onQUANTUM INFORMATION THEORY AMD COMPUTATIONby Soorya RethinasamyTo all the quantum information theory en...
15/01/2020

Lecture Series on
QUANTUM INFORMATION THEORY AMD COMPUTATION

by Soorya Rethinasamy

To all the quantum information theory enthusiasts out there!

Physics Association presents a LECTURE SERIES on "Quantum Information Theory and Computation" by Soorya Rethinasamy, a quantum computing aficionado who is currently in his last semester on campus.

About the instructor:

Soorya is an M.Sc. Physics and B.E. Computer science engineering dual degree student who is eager to share his knowledge in the fields of quantum information theory and quantum computing. He did his thesis on Quantum information theory from Louisiana State University (LSU) in the previous semester.

Quantum Information Theory is the study of how tasks such as storage and transmission of information can be accomplished using quantum mechanical systems. It deals with how the quantum–mechanical properties of physical systems can be exploited to achieve efficient storage and transmission of information. Applications of Quantum computing have been made in fields like Artificial Intelligence, Cryptography, Molecular Modeling, Financial Modeling, Weather Forecasting, Particle Physics, and many more.

About the course:

The course will cover all the topics from the basics, students with non-B5 background can also enroll. It is open to all those who wish to delve deeper into the quantum world. Attached herewith is a detailed handout of the course, along with the instructor's contact number and e-mail id.

The introductory lecture will be held on ***16th January, Thursday, from 6 pm to 7 pm, in NAB 6102.***

WHAT'S YOUR TAKE?TOP 10 GREATEST SCIENTISTS WHO NEVER WON A NOBEL PRIZEThe nobel prize can be as controversial as it is ...
26/12/2019

WHAT'S YOUR TAKE?

TOP 10 GREATEST SCIENTISTS WHO NEVER WON A NOBEL PRIZE

The nobel prize can be as controversial as it is prestigious.

This is a list of scientists who have contributed greatly to our understanding of the world but who unfortunately never won the top honors. While some of the nobel snubs were the product of personal grudges or general biases particularly against women, others were matters of bad timing.

10. Stephen Hawking, British physicist and mathematician

The ailing theoretical physicist was known for his contributions to the fields of cosmology, general relativity and quantum gravity, especially in the context of black holes. For a man who was given just a few years to live in his twenties not only did he beat the odds but also revolutionized physics for next half a century.

9. Jocelyn Bell Burnell, Irish astrophysicist

Her discovery of rotating neutron stars was recognized by the award of the 1974 Nobel Prize in Physics, but despite the fact that she was the first to observe the pulsars, Bell was excluded from the recipients of the prize.
As a postgraduate student, she helped in building the 16,000 m² radio telescope over two years and was the first person to notice the anomaly, sometimes reviewing as much as 29 meters of paper data per night.

8. George Sudarshan, Indian physicist

In 2005 several physicists wrote to the Swedish Academy, protesting that Sudarshan should have been awarded a share of the Prize for the Sudarshan–Glauber representation in quantum optics, for which American physicist Roy J. Glauber won his share of the prize.

7. Chien-Shiung Wu, Chinese experimental physicist

She is best known for conducting the Wu experiment, which contradicted the most revered law of conservation of parity. This discovery resulted in her colleagues Lee and Yang winning the 1957 Nobel Prize in physics. Wu was not publicly honored until 1978.

6. Lise Meitner, Austrian-Swedish Chemist

Lise Meitner along with long-time collaborator Otto Hahn led a small group of scientists who became the first to discover the nuclear fission of Uranium. The 1944 Nobel Prize in Chemistry was awarded exclusively to Otto Hahn and once again, a deserving candidate was not recognized.
According to Physics Today, Meitner's exclusion from the chemistry award may well be summarized as a mixture of disciplinary bias, political obtuseness, ignorance, and haste. Today, nuclear fission is used to produce electricity in the nuclear power plants.

5. Georges Lemaitre, Belgian Cosmologist

Lemaître proposed the Big Bang theory. He was the first cosmologist ever nominated for the 1954 Nobel Prize in physics for his prediction of the expanding universe. Remarkably, he was also nominated for the 1956 Nobel prize in chemistry for his primeval-atom theory. He did not win both times.

4. Henri Poincaré, French scientist

Poincaré is considered brighter than Einstein by many a scientists. He was the first to propose gravitational waves emanating from a body and propagating at the speed of light as being required by the Lorentz transformations. Poincaré was nominated a record 51 times for the Nobel Prize but never won.

3. Nikola Tesla, Serbian Inventor

Nikola Tesla was a brilliant inventor known for his contributions to physics and engineering. He is most recognized for developing the alternating current electric system, which is still the predominant system used across the world today. His other inventions include Tesla coil, remote control and wireless telegraphy.

2. Edwin Hubble, American Astronomer

First, he revolutionized cosmology by showing that ours was not the only galaxy. The clouds of light which astronomers saw in the night sky were actually other galaxies beyond our Milky Way. He calculated distances to these galaxies.
Second, he took the world by storm by proving that the galaxies were moving away from one another. The entire universe was expanding. He calculated the speeds at which the galaxies were receding. At the time of these two crucial discoveries, the Nobel Prize in Physics did not recognize work done in astronomy.
Hubble spent much of the latter part of his career attempting to have astronomy considered an area of physics. Shortly after his death, the Nobel Prize Committee decided that astronomical work would be eligible for the physics prize, however, the prize is not one that can be awarded posthumously.

1. Satyendra Nath Bose, Indian Theoretical Physicist

Bose is best known for his work on quantum mechanics in the early 1920s, providing the foundation for Bose–Einstein statistics and the theory of the Bose–Einstein condensate, the fifth state of matter.
Bose's work was evaluated by an expert of the Nobel Committee, Oskar Klein, who did not see his work worthy of a Nobel Prize.
Several Nobel Prizes were awarded related to the field initiated by him but Bose himself was never presented the coveted prize. **Yet half the particles in the universe obey him and that itself is a remarkable achievement.**

Source:

The nobel prize can be as controversial as it is prestigious.

22/11/2019

PHYSICISTS IRREVERSIBLY SPLITS PHOTONS BY FREEZING THEM IN A BOSE-EINSTEIN CONDENSATE

Light can be directed in different directions, usually also back the same way. Physicists from the University of Bonn and the University of Cologne have, however, succeeded in creating a new one-way street for light. They cool photons down to a Bose-Einstein condensate, which causes the light to collect in optical "valleys" from which it can no longer return. The findings from basic research could also be of interest for the quantum communication of the future. The results are published in Science.

A light beam is usually divided by being directed onto a partially reflecting mirror: Part of the light is then reflected back to create the mirror image. The rest passes through the mirror. "However, this process can be turned around if the experimental set-up is reversed," says Prof. Dr. Martin Weitz from the Institute of Applied Physics at the University of Bonn. If the reflected light and the part of the light passing through the mirror are sent in the opposite direction, the original light beam can be reconstructed.

The physicist investigates exotic optical quantum states of light. Together with his team and Prof. Dr. Achim Rosch from the Institute for Theoretical Physics at the University of Cologne, Weitz was looking for a new method to generate optical one-way streets by cooling the photons: As a result of the smaller energy of the photons, the light should collect in valleys and thereby be irreversibly divided. The physicists used a Bose-Einstein condensate made of photons for this purpose, which Weitz first achieved in 2010, becoming the first to create such a "super-photon."

A beam of light is thrown back and forth between two mirrors. During this process, the photons collide with dye molecules located between the reflecting surfaces. The dye molecules "swallow" the photons and then spit them out again. "The photons acquire the temperature of the dye solution," says Weitz. "In the course of this, they cool down to room temperature without getting lost."

By irradiating the dye solution with a laser, the physicists increase the number of photons between the mirrors. The strong concentration of the light particles combined with simultaneous cooling causes the individual photons to fuse to form a "super-photon," also known as Bose-Einstein condensate.

Two optical valleys "catch" the light

The current experiment worked in accordance with this principle. However, one of the two mirrors was not completely flat, but had two small optical valleys. When the light beam enters one of the indents, the distance, and therefore the wavelength, becomes slightly longer. The photons then have a lower energy. These light particles are "cooled" by the dye molecules and then pass into a low-energy state in the valleys.

However, the photons in the indents do not behave like marbles rolling over a corrugated sheet. Marbles roll into the valleys of the corrugated sheet and remain there, separated by the "peaks."

"In our experiment, the two valleys are so close together that a tunnel coupling occurs," reports lead author Christian Kurtscheid from the Weitz team. It is therefore no longer possible to determine which photons are in which valley. "The photons are held in the two valleys and enter the lowest energy state of the system," explains Weitz. "This irreversibly splits the light as if it were passing through an intersection at the end of a one-way street, while the light waves remain in lockstep in different indents."

The scientists hope that this experimental arrangement will make it possible to produce even more complex quantum states that allow the generation of interlaced photonic multi-particle states. "Perhaps quantum computers might one day use this method to communicate with each other and form a kind of quantum Internet," says Weitz with a view towards the future.
Source: phys.org
https://phys.org/news/2019-11-physicists-irreversibly-photons-bose-einstein-condensate.amp

The semester's first Students' Talk Series lecture on the topic "The earth isn't perfectly round and why it matters!" wa...
17/11/2019

The semester's first Students' Talk Series lecture on the topic "The earth isn't perfectly round and why it matters!" was organized on 15th November. The speaker, Avinash Sontakke, recounted his experience and work done at the Inter-University Center for Astronomy and Astrophysics (IUCAA), Pune.

NOBEL PRIZE IN PHYSICS 2019The Nobel Prize in Physics 2019 was awarded "for contributions to our understanding of the ev...
09/10/2019

NOBEL PRIZE IN PHYSICS 2019

The Nobel Prize in Physics 2019 was awarded "for contributions to our understanding of the evolution of the universe and Earth's place in the cosmos" with one half to James Peebles "for theoretical discoveries in physical cosmology", the other half jointly to Michel Mayor and Didier Queloz "for the discovery of an exoplanet orbiting a solar-type star."

RUMORS HINT THAT GOOGLE HAS ACCOMPLISHED QUANTUM SUPREMACYA leaked paper suggests that Google has achieved a milestone k...
24/09/2019

RUMORS HINT THAT GOOGLE HAS ACCOMPLISHED QUANTUM SUPREMACY

A leaked paper suggests that Google has achieved a milestone known as quantum supremacy, using a quantum computer to perform a calculation that couldn’t be achieved even with the world’s most powerful supercomputers.

It’s a hotly anticipated goal, and one intended to mark the beginning of a new era of quantum computation (SN: 6/29/17). But it’s also largely symbolic: The calculation in question serves no practical purpose and is designed to be difficult for classical computers, standard computers that are not rooted in quantum physics.

On September 20, the Financial Times reported that a scientific paper, briefly published on a NASA website before being removed, claims that Google has built a quantum computer that achieved quantum supremacy. It’s a benchmark that the company’s quantum researchers, led by physicist John Martinis of the University of California, Santa Barbara, have set their sights on for years (SN: 3/5/18). An apparent plain-text version of the paper, posted anonymously on the site Pastebin, has since been circulating among scientists and on Twitter. A spokesperson for Google declined to comment to Science News.

According to the Pastebin version of the paper, Google created a quantum computer named Sycamore with 54 quantum bits called qubits, 53 of which were functional. The researchers used it to perform a series of operations in 200 seconds that would take a supercomputer about 10,000 years to complete.

The calculation consists of performing random operations on the qubits and reading out the result. After doing this many times, the researchers are left with a nearly random assortment of numbers, one that is extremely difficult to reproduce with a classical computer.

Despite its lack of applications, quantum supremacy has been billed as a major breakthrough in the quest for a quantum computer that could eventually perform useful calculations that are not possible with classical computers. “This dramatic speedup relative to all known classical algorithms provides an experimental realization of quantum supremacy on a computational task and heralds the advent of a much-anticipated computing paradigm,” the text of the Pastebin paper reads.

The machines might eventually be capable of defeating encryption techniques used to secure certain transmissions, such as financial transactions made by computers. But that advance will require many more qubits and a method to correct the errors that inevitably creep into quantum calculations. “While this is a milestone, it is *very* far from being a quantum computer that can compute anything useful,” physicist Jonathan Oppenheim of University College London wrote on Twitter.

Not everyone agrees that quantum supremacy is a useful benchmark. “Quantum computers are not ‘supreme’ against classical computers because of a laboratory experiment designed to essentially (and almost certainly exclusively) implement one very specific quantum sampling procedure with no practical applications,” IBM’s director of research Dario Gil wrote in a statement sent to Science News.

IBM is developing their own line of quantum computers (SN: 11/10/17), and researchers there prefer to talk about “quantum advantage,” which they define as “the point at which quantum applications deliver a significant, practical benefit beyond what classical computers alone are capable.” The new result falls short of that standard.

Credits:

Reports suggest a quantum computer has bested standard computers on one type of calculation, but practical applications are still a distant goal.

WINDOW OF OPPORTUNITYIn 2015, you must have heard something about hearing the universe talking to us now, literally. It ...
16/09/2019

WINDOW OF OPPORTUNITY
In 2015, you must have heard something about hearing the universe talking to us now, literally. It was quite the talk of the ‘astro’ town at that time. Yes, it’s about the gravitational waves. On September the 14th, after mere minutes of opening of the Laser Interferometry and Gravitational wave Observatory (LIGO) at the two sites in USA, a wave passed by Earth that changed the dimensions of the space time of this region.
That was a Gravitational wave which could have been originated only from a violent collision in space time as our instruments, relatively speaking were not very advanced to measure very small changes in space time. This type of phenomena was thought to be very rare as, in spite of so much advancement in the field of observational astrophysics, we detected blackhole-blackhole collisions in the 21st century only. This was considered success as some scientists had devoted the better half of their life to this project and finally achieved it. Then another detection occurred after some months, then another and another.
So in 2018-19 further development in the Advanced LIGO was done in the hope to find some more of these collisions. And to our surprise, we discovered more of them. Even one neutron star-neutron star collision and one neutron star-blackhole collision were discovered which were even verified by the Gamma Ray observatory of NASA and ESA and the technologically twin of Ligo, Italy’s VIRGO. So these events are not that rare as we thought before and if we further develop our instruments to higher degree of precision it is expected to give more outcomes. Some scientists estimate that by 2023, we could be seeing blackhole collisions in an hourly basis.
So a new theory is emerging about the abundance of blackholes scattered across our spacetime. It’s going to be a very hot field in astrophysics as study of the pattern of randomness in these collisions can tell us many things.
Every nation and scientific community across the globe are now trying to grab a first hand on it. For example India has collaborated with LIGO to have INDIGO so that it would serve LIGO and VIRGO to triangulate the exact location of the mergers in the future.
NASA has plans of whole other level. The mirrors in the LIGO are to be replaced by space mirrors carried by satellites across millions of miles whose precision would be unimaginable.

There is a revolution underway, a gravitational wave revolution that will render the data bases around the world space-less and would start a new study which will continue in generations to come. As the fourth anniversary of the first detection approaches, the field continues to mature-with a bright future ahead.\

Image Source: Internet

Continuing the annual tradition of thanking our professors, Teachers' Day was celebrated on 7th September. The program c...
08/09/2019

Continuing the annual tradition of thanking our professors, Teachers' Day was celebrated on 7th September. The program consisted of some fun events and cake cutting with the professors; where they also shared some of their wonderful anecdotes!
The event is held every year with the purpose of strengthening the student- teacher bond and giving the professors an evening to remember!!

04/09/2019
Scientists Detected 2 Black Hole Mergers Just 21 Mins Apart, But It's Not What We HopedLast Wednesday, a gravitational w...
31/08/2019

Scientists Detected 2 Black Hole Mergers Just 21 Mins Apart, But It's Not What We Hoped

Last Wednesday, a gravitational wave detection gave astronomers quite the surprise. As researchers were going about their work at the Laser Interferometer Gravitational-Wave Observatory (LIGO), a pair of gravitational waves rolled in just minutes apart.
The first, labelled S190828j, was picked up by all three of LIGO's gravitational wave detectors at 06:34 am, coordinated universal time. The second, S190828l, was measured at 06:55 – a mere 21 minutes later.
Both seemed to be the run-of-the-mill dying screams of black holes as they squish together. But here's why it's so surprising: astronomers wouldn't expect to see a pair of signals in such quick succession.
In fact, this is only the second time two detections have rolled in on the same day. What's more, at first glance they also seemed to echo from more or less the same patch of sky.

One possibility briefly kicked around was that S190828j and S190828l were actually the same wave, divided by some sort of distortion in space before being roughly thrown together again. This would have been huge.Gravitational lensing – the warping effect an intervening mass has on space, as described by general relativity – can divide and duplicate the rays of light from far- off objects. It has become a useful tool for astronomers in the measurement of distances.

If this had indeed beetwo-for-one deal, it would be the first time a gravitational wave had been observed through a gravitational lens.
Alas, it's now looking pretty unlikely. As the hours passed, new details emerged indicating the two signals don't overlap enough to be originating from the same source.

Scientists face a problem in the wake of freaky events like this one. On the one hand, wild speculations have a habit of taking on a life of their own when discussed so frankly in a public space, transforming into an established fact while barely half baked.

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