Department of Physics, BHU, Varanasi

06/10/2020

The Nobel Prize in Physics 2020 was divided, one half awarded to Roger Penrose "for the discovery that black hole formation is a robust prediction of the general theory of relativity", the other half jointly to Reinhard Genzel and Andrea Ghez "for the discovery of a supermassive compact object at th...

08/10/2019

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....

10/04/2019

EHT's first image of a supermassive black hole in our galactic center.

04/10/2016

The Royal Swedish Academy of Sciences has decided to award the Nobel Prize in Physics 2016 with one half to

David J. Thouless
University of Washington, Seattle, WA, USA

and the other half to

F. Duncan M. Haldane
Princeton University, NJ, USA

and

J. Michael Kosterlitz
Brown University, Providence, RI, USA

”for theoretical discoveries of topological phase transitions and topological phases of matter”

Nobelprize.org, The Official Web Site of the Nobel Prize

01/09/2016

An ultrafast "electron camera" at the Department of Energy's SLAC National Accelerator Laboratory has made the first direct snapshots of atomic nuclei in molecules that are vibrating within millionths of a billionth of a second after being hit by a laser pulse. The method, called ultrafast electron…

25/07/2016

How many photons does it take to light up an atom? Researchers have shown theoretically that it’s possible to excite two atoms—or even more—simultaneously by absorbing just a single photon between them. The process should be reversible, so that the atoms can return to a lower-energy state by collectively emitting one photon. This nonintuitive phenomenon might find applications in quantum information processing, the researchers say.

Excitation of a single atom by the absorption of two photons is a well-known process. Together the photons convey enough energy to boost the atom from a lower-energy state to a higher-energy state, even without an intermediate rung of the energy ladder. This two-photon absorption is now commonly used in spectroscopy and microscopy, while double emission of photons by an excited atom is a standard way to make so-called entangled photons, which have interdependent quantum states.

Theorists show that two atoms in an optical cavity can absorb the same photon.

12/07/2016

Resonance fluorescence is an iconic example of quantum optics in open systems—those that interact with the environment. It describes the scattering of light from a two-state system, such as an atom, that is illuminated by light at its resonance frequency, and it is a direct result of quantum fluctuations in the vacuum. In a remarkable experiment with a superconducting-circuit qubit and squeezed microwave photons, researchers have extended the observation of resonance fluorescence from a two-state system bathed by ordinary vacuum fluctuations to one embedded in a reengineered bath where vacuum fluctuations are squeezed, thus permitting narrow spectroscopic lines to be observed [1]. This work, from the laboratory of Ifan Sidiqqi at the University of California, Berkeley, realizes a theoretical proposal of some 30 years standing, and it demonstrates, yet again, the power of superconducting-circuit quantum optics in addressing textbook physics in the area of simple open quantum systems.

By bathing a superconducting qubit in squeezed light, researchers have been able to confirm a decades-old prediction for the resulting phase-dependent spectrum of resonance fluorescence.

07/07/2016

Physicists have performed the first full simulation of a high-energy physics experiment — the creation of pairs of particles and their antiparticles — on a quantum computer1. If the team can scale it up, the technique promises access to calculations that would be too complex for an ordinary computer to deal with.

The technique would help address problems that classical computers can't handle.

09/06/2015

The first phase of spectroscopic investigations were directed by Professor R K Asundi from 1939 till his retirement in 1956. Professor Asundi was actively supported by Dr N L Singh who had spent more than 6 years, before arrival of the former in BHU, in acquiring skills of experimental and theoretical research under the guidance of Professor C M Sogani and Professor V V Narlikar at BHU and under Professor K S Krishnan at Calcutta.http://laser-spectro.blogspot.in/2014/06/diamond-jubilee-year-of-spectroscopy-in.html

09/06/2015

24/12/2014

http://www.ndtv.com/article/india/bharat-ratna-for-pandit-malaviya-revered-by-gandhi-639301?pfrom=home-lateststories

For Jawaharlal Nehru, India's first prime minister, Pandit Madan Mohan Malaviya was a giant among men who laid the foundation of nationalism in the country. Mahatma Gandhi, father of the nation, called himself Dr Malaviya's devotee saying his patriotism flowed like the uninterrupted Ganga.

07/10/2014

BREAKING NEWS: in Physics to
Isamu Akasaki 名城大学 －Meijo University－, Hiroshi Amano 名古屋大学 | Nagoya University, Shuji Nakamura, University of California, CA, USA