Research Projects

The aim of this project is to develop a state of art microwave quantum memory (QM) based on electron spins for superconducting processors. such QM is an essential component in the field of quantum information processing. Firstly, it removes expensive overheads and redundancies of quantum error correction to minimize cost and power handling. secondly, it allows to interface several processing units housed in different dilution refrigerators for scaling up qubits, quantum communication and cryptography. The QM experiments will be carried out in the quantum regime at 20mK such that energy scales involved are much larger than the thermal noise. Despite the low energy of microwave photons, recent development of high sensitivity inductively coupled electron spin resonance spectroscopy based on circuit quantum-electrodynamics has made it possible to achieve high fidelity readouts of single microwave photons. The implementation of QM will in addition need superconducting resonators with tunable frequency and bandwidth. The spin ensemble system will consist of bismuth dopants in isotopically purified silicon, which supports long coherence times due to presence of a clock transition: insensitive to magnetic noise to the first order. Other rare earth systems such as erbium will also be explored as these support microwave to optical transitions. Apart from the stated advantage of a QM, the proposed project aims to investigate physics of high-cooperativity coupling of spins to low loss superconducting resonators from which two-level masers can be developed. similar experimental resources will also allow us to probe material systems with low density of paramagnetic species such as in low dimensional materials with a high resolution. And thus collaborations can be setup across the teams in characterizing chemical and biological samples.