1. Sabarmati Young Researchers Seminar: 9th Jan 2020: Generating steady state coherence a solid state qubit using quantum noise from phonons by Dr. Archak Purkayastha, a post-doctoral fellow in the group of John Goold at Trinity College, Dublin
Title: Generating steady state coherence a solid state qubit using quantum noise from phonons.
Speaker: Dr. Archak Purkayastha, Post Doctoral Fellow at Trinity College, Dubin.
Coordinates: 09 Jan 2020, 7/210
Abstract: Much of quantum technology depends on generation and control of coherence in a qubit. In particular, coherence in the energy eigenbasis of a system has been recognized as a resource. However, coherence in energy eigenbasis is usually fragile. Interaction of the system with its surrounding environment provides noise in the qubit parameters, which in turn is thought to lead to decoherence, i.e, loss of coherence in the energy eigenbasis. In this talk, I will show that while this is true for classical noise in qubit parameters, quantum noise in qubit parameters actually generates coherence in the energy eigenbasis of the qubit under generic conditions. This coherence occurs in the steady state and is therefore robust. This is particularly interesting in the context of a solid state double-quantum-dot (DQD) charge qubit where quantum noise from phonons in the substrate is the leading source of noise. Moreover, the DQD charge qubit is widely tunable, and by controlling its parameters, regimes of high purity along with coherence in energy eigenbasis can be found. The coherence is robust to presence of fermionic leads at equilbrium, and can be used to displace a cavity mode.
Bio: Archak graduated with Bachelors degree in Physics from Jadavpur University, Kolkata, in 2011, followed by a Masters Degree in Physics from Indian Institute of Technology, Kanpur, in 2013. Then he did his Ph.D at the International Centre for Theoretical Sciences, Tata Institute for Fundamental Research (ICTS-TIFR), Bangalore, under the supervision of Prof. Abhishek Dhar. He defended his PhD in September, 2018. He stayed at ICTS-TIFR till December, 2018 as a visiting-fellow. From Feb 1, 2019, he has joined the QuSys team of John Goold at Trinity College, Dublin for his post-doctoral research. During his PhD, he has developed expertise in the formalism for investigating transport phenomena in open quantum systems. In Dublin he is exploring thermodynamics of open quantum systems, and applications of open quantum systems in building, for example, quantum engines and sensors.
2. Seminar Series on Indian scientists: 1st edition on October 5, 2019
The first edition of the seminar series on Indian scientists was held on October 5, 2019, at IIT Gandhinagar.
In the late 19th century and the first half of the 20th century, there was a great renaissance of modern scientific thinking in India. The father figures of modern Indian Science from this era contributed significantly to contemporary scientific advances. At the same time, they motivated and led the national movement to create scientific institutions in India. This Seminar Series on Indian Scientists aims to honour the contributions of these often half-forgotten pioneers.
Each seminar in the series was of one day, with a mix of speakers from outside and within IITGn. In this first edition, on Saturday 5th October, we had four lectures on the lives and works of Satyendranath Bose, Meghnad Saha, G.N. Ramachandran, and Prafulla Chandra Roy.
Students & Faculty members from all institutions were invited.
3. Quantum Thermal Machines Workshop 2019
4. Physics Colloquium by Prof. Sourendu GuptaProfessor Sourendu Gupta from Department of Theoretical Physics, Tata Institute of Fundamental Research (TIFR)-Mumbai visited us from December 10-11, 2018. He delivered a Physics colloquium on 10th Dec 2018 (Around 3:00 Pm).
5. Frontier Problems in Physics : A Symposium @ IIT Gandhinagar
The physics discipline of IIT Gandhinagar hosted a two-day symposium "Frontier Problems in Physics" on November 20 - 21st, 2018. In this symposium, distinguished scientists gave lectures on outstanding research areas in theoretical and experimental physics. The symposium aimed to present the state of the art in physics research to beginning researchers and students.
To view the poster click here
For more information click : http://events.iitgn.ac.in/2018/sp2018/
© 2020 All Rights Reserved