Projects

Current Project

Engineering Spin-Photon Coupling in Semiconductor Spin Qubits Platform

UNSW Sydney

Kundan is addressing the challenges in spin qubits to enhance spin-photon coupling mechanisms within semiconductor spin qubit architectures, aiming to enable scalable quantum information processing. Semiconductor spin qubits, known for their compatibility with existing CMOS technology and long coherence times, face significant hurdles when interfacing with photonic modes—an essential requirement for quantum communication and distributed quantum computing. His research focuses on developing and optimizing spin-photon interfaces through electric dipole spin resonance (EDSR) and cavity quantum electrodynamics (cQED). By tackling key limitations such as decoherence, coupling efficiency, and device scalability, Kundan’s work aspires to advance hybrid quantum systems in which solid-state qubits are seamlessly networked via photonic channels.

Previous Projects

Development of Electro-Optic Control for Miniaturised Satellite QKD Transmitter

Space Applications Center (ISRO), Ahmedabad

Involved in the development of a satellite-based, decoy-enabled Quantum Key Distribution (QKD) transmitter. Designed to eliminate the need for eight lasers by incorporating a Mach-Zehnder Intensity Modulator (MZM) and Polarization Modulator (PM) for implementing the BB84 protocol. The setup reduces laser distinguishability and mitigates photon number splitting (PNS) attacks. System-level simulations were carried out in Optisystem and MATLAB, with experimental validation using the IMC-1550-20-PMMZM device.

Active Quenching Circuit for Avalanche Photo-Diode in QKD Experiments

Physical Research Laboratory, Ahmedabad

Developed a high-frequency active quenching circuit for Avalanche Photodiodes aimed at increasing key rates in QKD systems. The design targets single-photon detection at 100 MHz using high-voltage, high-speed GaN transistors while addressing parasitic effects. Optimization focused on enhancing accuracy and timing precision at high speeds.

Receive Active Beamforming RFIC at Ka & Q-band for LEO Communication Satellite

Space Applications Center (ISRO), Ahmedabad

Part of a technology demonstration project developing an 8-channel RFIC with LNAs, digital phase shifters, and digital attenuators. The chip, fabricated in TowerJazz’s SBC13s4 130nm process, was designed to be radiation-hardened and fault-tolerant, supporting Ka/Q-band frequencies for beamforming applications.

Third Harmonic Feedback Enabled T/R Module for Far-Field Wireless Power Transfer

IIST, Thiruvananthapuram

Designed a feedback-enabled T/R module for 2.45 GHz wireless power transmission with 7.35 GHz third harmonic feedback for beam alignment and tracking. Achieved system-level simulations in SystemVue and full T/R module design in Keysight ADS. The architecture improves alignment efficiency and supports mobile or multi-receiver environments.

Dual-Band Shared Aperture Antenna (SAA) Array

IIST, Thiruvananthapuram

Developed a compact, dual-band antenna radiating at 2.45 GHz and 7.35 GHz using a shared aperture configuration. Designed in CST Microwave Studio, the antenna achieved high gain and low mutual coupling for integration in feedback-enabled wireless power transfer systems.

Publications