|09:30 to 10:05||Manas Kulkarni (ICTS-TIFR, India)||
Collective Description of Trapped Fermions: Exact Results
Exact results for collective behaviour of trapped Fermions have remained elusive. Apart from mean-field approaches (Local
 M. Kulkarni, S. N. Majumdar, G. Schehr, Phys. Rev. A 103, 033321 (2021)
|10:05 to 10:40||Srinivasa Prasannaa V (TCG CREST, Kolkata, India)||
Electron Electric Dipole Moment Searches Using Ultracold Molecules
|10:40 to 11:15||Sonjoy Majumder (IIT, Kharagpur, India)||
Quantum Instability @Driven Bose-Einstein Condensate (BEC)
In this presentation, I would like to discuss the spontaneous formation of quantum turbulence at the surface (single) and interface (binary) of Bose-Einstein condensate (BEC). I will highlight the physics behind the generation of different oscillating patterns parametrically excited by modulating the scattering lengths. The effective Mathieu equation and Floquet analysis are used here to characterize the patterns [1,2]. The characterizations are supported by experimental observation . I will briefly explain how our theory can predict the generated interfacial tension useful to characterize the condensate. In the end, I will summarize the presentation with the future scopes of these works with different experimental realizations and applications of high-lying collective excitations leading to quantum turbulence.
|11:15 to 11:45||-||Poster|
|11:45 to 12:20||Kanhaiya Pandey (IIT, Guwahati, India)||
Laser Cooling and Trapping of Rb 5S 1/2 - 6P Blue Transition
|12:20 to 12:55||Bijaya Sahoo (PRL, Ahmedabad, India)||
New Directions for Isotope Shift Studies
|14:30 to 15:05||Yoji Ohashi (Keio University, Tokyo, Japan)||
Isothermal compressibility and effects of three-body molecular interaction in a strongly interacting ultracold Fermi atomic gas (Online)
We theoretically discuss the isothermal compressibility in the normal state of an ultracold Fermi gas with a tunable pairing interaction associated with a Feshbach resonance. Including strong pairing fluctuations caused by this tunable interaction within the framework of the self-consistent T-matrix approximation (SCTMA), we numerically evaluate this thermodynamic quantity over the entire BCS-BEC crossover region. In the unitary limit, the calculated isothermal compressibility is shown to agree well with the recent experiment on a 6Li Fermi gas. In the strong-coupling BEC regime, we also show that, not only a two-body interaction between Cooper-pair molecules, but also a three-body molecular interaction sizably contribute to the isothermal compressibility. Our results indicate that the isothermal compressibility is a useful quantity for the study of how Cooper pairs are correlated to each other in a strongly interacting Fermi gas.
|15:05 to 15:40||Ozgur E. Mustecaplioglu (Koc University, Istanbul, Turkey)||
Quantum Optics of Heat Engines and Thermal Devices
Quantum optics is the branch of science that investigates the statistical properties of light interacting with matter. Statistical mechanics and thermodynamics lie at the heart of quantum optics, and more generally, quantum mechanics, starting with Max Planck’s explanation of ultraviolet catastrophe in blackbody radiation in 1900. Modern efforts to understand to which extent thermodynamical laws apply to microscopical systems, including our ever-shrinking technological devices, led to the rapidly emerging field of quantum thermodynamics. Not surprisingly, quantum optics gave the impetus to the growth of interest in quantum thermodynamics. Many years after the recognition of maser as a heat engine in 1959 by Scovil and Schulz-DuBois , Marlan O. Scully and co workers came up with the idea of using quantum superposition states, or quantum coherence, as a resource to power up a photonic Carnot engine in 2003. The proposal is based on the paradigmatic quantum optical system, a micromaser consisting of an optical cavity pumped by a beam of atoms. In the following decades, researchers in quantum thermodynamics revealed the interplay of quantum information and energetics of quantum systems by generalizing the traditional thermodynamical concepts of heat and work in the quantum realm . Quantum optical systems were again the typical testbeds as well as a medium for applications, such as quantum photovoltaics , quantum thermal diodes and transistors , quantum sensors , and so on, based on these conceptual developments. This lecture will first briefly review the basics of quantum thermodynamics from a quantum optical perspective. The second part of the lecture will discuss examples and applications of quantum thermodynamical theories in photonic systems and devices.
|15:40 to 16:15||Utpal Roy (IIT, Patna, India)||
Quantum Simulation and Quantum Sensing with Trapped Ultracold Atoms
Bose-Einstein condensate (BEC) is a highly coherent and tunable quantum matter, which has opened up huge possibility towards emerging areas like quantum simulation and quantum sensing [1,2]. Applications of ultracold atoms as quantum simulator mostly rely on the external trap which can efficiently be engineered to a desired shape due to the unprecedented progress in the experimental front. However, investigating the dynamics of such system through exact theoretical approach becomes quite nontrivial due to its nonlinear nature and the presence of varying external trap upon engineering. Various optical lattices are found to be the most favorable candidates for quantum simulation and the underlying dynamics can exhibit various novel and complex quantum phenomena like Anderson-like localization, negative absolute temperature etc. [3-7]. In this talk, I will present analytical approaches for quasi-periodic optical lattices which can hold and mould matter waves in self similar form like soliton. Applications of BEC under a bi-chromatic optical lattice, engineered superlattices and for quantum precision measurements will be addressed [2,4,6,8].
|16:15 to 16:45||-||Poster|
|16:45 to 17:20||Sebastian Wuster (IISER, Bhopal, India)||
Rydberg atoms in Bose-Einstein condensed environments: from bubble chambers to controllable open quantum systems
Abstract: Rydberg Atoms in highly excited electronic states with n=30-120 can be excited within Bose-Einstein condensates (BECs), and while lifetimes are shorter than in vacuum [1,2], they live long enough to interestingly interact with the BEC . We theoretically study this interaction in the mean-field limit and beyond.
For multiple Rydberg atoms in a single electronic state, we show that the phase coherence of the condensate allows the tracking of mobile Rydberg impurities akin to bubble chambers in particle physics [4,5]. For a single Rydberg atom with multiple electronic states, we provide spectral densities of the BEC as a decohering environment , and show that the BEC can image a signature of the entangling evolution that causes Rydberg qu-bit decoherence . Finally, an aggregate of multiple Rydberg atoms in BEC shows promise for quantum simulations of photosynthetic energy transport, extending .
 Schlagmüller et al. PRX 6 (2016) 031020.
 Kanungo et al. PRA 102 (2020) 063317.
 Balweski et al. Nature 502 (2013) 664.
 Tiwari et al. PRA 99 (2019) 043616.
 Tiwari et al. https://arxiv.org/abs/2111.05031 (2021).
 Rammohan et al. PRA 103 (2021) 063307.
 Rammohan et al. PRA (Letters) 104 (2021) L06020.
 Schönleber, et al. PRL 114 (2015) 123005.
|17:20 to 17:55||Rejish Nath (IISER, Pune, India)||
Overlapping Bright Solitons in Spin-1 Bose-Einstein Condensates
We discuss the dynamics of both population and spin densities, emerging from the spatial overlap between two distinct polar bright solitons in Spin-1 Spinor Condensates. The dynamics of overlapping solitons in scalar condensates exhibits soliton fusion, atomic switching from one soliton to another and repulsive dynamics depending on the relative phase between the solitons. In the spinor case, non-trivial dynamics emerges in both spatial and spin degrees of freedom, depending on the relative phase and the ratio between the spin-dependent and spin-independent interactions.