Development of Josephson Parametric Amplifiers for superconducting qubits based quantum processors

Josephson Parametric Amplifiers (JPA) are some of the lowest noise microwave frequency amplifiers which are crucial for any superconducting quantum processor as they help in achieving high fidelity measurements in a short amount of time. This makes them an invaluable tool for quantum error correction as well. These devices can be quickly commercialized, and the engineering needed is not very complicated. Making them broadband and high dynamic range will require further research and can be soon turned into a marketable technology with a wide market both in industry and academia. The basic component of a JPA is a non-linear inductor which is implemented using Aluminium Josephson Junctions which can be fabricated using ebeam lithography and double angle metal deposition.

This project plans to develop the following three types of devices:

1. Narrow band JPAs.

2. Impedance engineered broadband JPAs.

3. Broadband Travelling Wave Parametric Amplifiers (TWPA).

Development of tunable lasers and portable atomic platforms for Quantum information processing and sensors

Trapped atoms in 1D, 2D, or 3D lattices can be used as qubits since they possess all the required features, such as states with long coherence time and the possibility of initialization and readout. Further, this is a very attractive platform for quantum computation due to the scalability, comprehensive manipulations of the qubits, and the possibility of turning off and on the interaction between the atoms on demand.

The project aims at developing these systems locally such that they may be used in high precision laser spectroscopy laboratories in India.

Objectives of the project are:

1. In the first phase, construction of diode laser and tapered amplifier laser systems with electronics.

2. In the second phase, the construction of all other relevant laser systems and the designing and construction of the main vacuum chamber indigenously.

3. In the third phase, designing and constructing of portable atomic platforms for Quantum information processing chamber indigenously.

Development of nitrogen vacancy centre based quantum register

The significant technological outcome of this project would be the development of a diamond magnetometry setup that can operate at zero magnetic field. NV centers in a diamond magnetometer can be used to perform quantitative, self- calibrated and reproducible measurements of the magnetic field. This NV-diamond magnetometer setup can be further miniaturized and developed into a compact and portable device that would be suitable for widespread use. It is envisioned that this novel quantum tool can be used by other researchers in experimental observation and exploration of magnetic material properties. Leveraging unique NV center properties, combined with diamond nanofabrication and microscopy expertise, this project has the potential to bridge the gap between lab and commercial setting, making novel quantum tools available for microscopy user community.