Speaker: Prof. Bimalendu Deb, Professor, School of Physical Sciences, Indian Association for the Cultivation of Science (IACS),

Jadavpur, Kolkata.

Title: "Two-qubit quantum gates in an ion-atom hybrid system"

Date: Wednesday, 11th March 2026 - Time: 4 PM

Tea & Coffee: 5 PM

Venue: CeNSE Seminar Hall

Abstract:
We propose an ion-atom hybrid system for quantum computing. We demonstrate the universal 
two-qubit CNOT gate with 89.9% fidelity between an ionic and an atomic qubit relying on 
Rydberg excitation of the atom and the resulting phonon blockade in the motional states of 
the ion [S. Mudli and B. Deb, https://arxiv.org/abs/2602.19222v1]. We further demonstrate a 
universal two-qubit gate operation with 97% fidelity between two neutral atom qubits based 
on ion-mediated interactions [S. Mudli et al. Phys. Rev. A 110, 062618 (2024)].  These demonstrations 
suggest that an ion-atom hybrid system can serve as a module of a quantum network for distributed 
quantum computing, leveraging the best features of charged as well as neutral atom qubits.

Biography:

Bimalendu Deb is a Professor of Physics, at the School of Physical Sciences, Indian Association 
for the Cultivation of Science (IACS), Jadavpur, Kolkata. He obtained a PhD (Science) from Jadavpur 
University in 1997. He has more than thirty years of experience in research and teaching in atomic, 
molecular and optical sciences. His current research interests include theoretical quantum optics, 
quantum computing and quantum sensing, cold atomic collisions, and related fields. Recently, he has 
published a book titled “Low energy collision physics: Applications to cold atoms, published by IOP 
publishing [https://iopscience.iop.org/book/mono/978-0-7503-3959-9]. This book can be used as a 
graduate text in collision theory and may serve as a bridge between teaching and research in cold atom science. 

Host Faculty:  Prof. Akshay Naik