Talks

In 1924, Bose communicated a derivation of the Planck distribution, to Einstein, where Bose introduced a key notion of indistinguishability of photon quanta. This was a turning point in the history of quantum mechanics. Bose's article is considered the fourth most important article, in the development of quantum mechanics, following those of Planck, Einstein and Niels Bohr. It was Dirac, who coined the names Bosons and Fermions.  We present a brief historical account of Bose’s discovery, followed by a bird’s eye view of the impacts of boson bloom and Bose-Einstein condensation in modern science and technology.

[1] Boson Bloom, G. Baskaran and A. May, J. Physics B, 57, 142001 (2024)

Quantum mechanics is a cornerstone of modern physics. Just as the 19th century was called the Machine Age and the 20th century the Information Age, the 21st century promises to go down in history as the Quantum Age. Quantum Computing promises unprecedented speed in solving certain classes of problems while Quantum Cryptography promises information theoretically secure communications. In this talk, I will discuss the world of single and entangled photons and also discuss ongoing work towards secure quantum communications, quantum information and precision experimental tests of principles of quantum mechanics in our Quantum Information and Computing lab at the Raman Research Institute, Bengaluru, India. I will end with our broad vision for the future, which includes establishment of long distance secure quantum communications in India and beyond involving satellite based, fibre based as well as quantum memory and repeater network based approaches towards the global quantum internet.
 

One important interdisciplinary approach of ecological systems is the "complexity" perspective, which is represented by many lectures in this school. This lecture covers complementary ideas about networks of species interactions, their structures, and the use of randomness to understand their general features.

In this talk I will give updates on two projects: Firstly, Perimeter and Two Small Fish Ventures are currently supporting a group of five PSI alumni in writing a play themed around quantum science & technology, with the goal of enriching public discourse on these fields. On the one hand, we aim to inform the audience about key quantum concepts in an entertaining setting. On the other hand, we are exploring questions such as "Will we really have fault-tolerant quantum computers in five years? Which quantum research is better pursued in industry vs. academia? Who will benefit from commercialization? What drives scientists to do quantum research - for scientific understanding, or because 'today's theoretical physics is tomorrow's technology'?". Five characters debate different takes on these questions in a Douglas-Adams-inspired sci-fi setting.

Secondly, I will review recent developments in classical and quantum reservoir computing.

In this talk we will review the dynamics of warm inflation and the effect of dissipation on the primordial spectrum. When inflation occurs in the so-called strong dissipative regime, this effect will lead to the enhancement of the spectrum over all scales. An in particular to large enough fluctuations over the last 10-20 efolds of inflation which on re-entry may form Primordial Black Holes and act as a source for the tensors at second order. We will discuss different realisations consistent with CMB observations, i.e., different combinations of potentials and dissipative coefficients. Typically the enhancement is maximal near the end of inflation, which result in a spectral density of Gravitational Waves (GW) peaked at large frequencies today, in the range of MHz. Although the frequency range is outside the reach of present and planned GW detectors, it might be reached in future high-frequency gravitational waves detectors, designed to search for cosmological stochastic GW backgrounds above MHz frequencies.

We study the impact of Leptogenesis on Gravitational Waves from phase transition. We consider a heavy scalar field that decays into radiation and heavy right-handed neutrinos. These heavy right-handed neutrinos decay eventually and generate the lepton asymmetry. A part of the lepton asymmetry transfers into the baryon asymmetry of the Universe via the sphaleron transitions. We identify the parameter space of Leptogenesis where it maybe probed due to the Gravitational Wave spectral shapes. We show that a Gravitational Wave signal which can be detectable in the low-frequency range of future predictions of LISA that is consistent with Leptogenesis.