Principal Investigator: Prof. Rajamani Vijayaraghavan

Co-PI: Prof. Mandar Deshmukh

The project will address the challenges of building a 4-qubit quantum computer using superconducting circuits with an optimal architecture which will enable scaling to larger processors in the near future. In particular it will address the following problems:

a) Design of high coherence superconducting qubits in both 3D and 2D architecture

b) Design of 4-qubit quantum processor in 3D architecture.

c) Design of 4-qubit quantum processor chip in 2D architecture.

d) Developing multiplexed readout technique using broadband parametric amplifiers.

e) Development and implementation of the necessary control and measurement electronics needed to demonstrate the operation of the quantum computer.

f) Identification and implementation of important quantum mechanical problems that can be run on a 4-qubit quantum processor.

Principal Investigator: Prof. Vibhor Singh

Co-PIs: Dr. Baladitya Suri, Prof. Subroto Mukerjee, Prof. Shayan Srinivasa Garani

The proposal addresses the design, fabrication, and measurement of a suitable blueprint for a scalable quantum computer based on the superconducting qubits. Specifically, we propose to explore tunable qubits with tunable coupling architecture, which do not suffer from frequency crowding issues, thus paving a way to scalable architecture.

Principal Investigator: Prof. Suddhasatta Mahapatra

Co-PIs: Prof. Bhaskaran Muralidharan, Prof. Sai Vinjanampathy

The problems intended to be addressed by the proposed project are essentially related to building different capabilities necessary for developing a scalable architecture for spin QC in silicon. These capabilities are listed below:

1. Epitaxial growth of high quality Si/SiGe (001) quantum well structures, necessary for realization of the physical qubits.

2. Fabrication of (an array) of quantum dots (QDs), capable of hosting spin qubits.

3. Fast and fiducial initialization of spin qubits.

4. Spin detection (measurement of spin qubits) exploiting spin blockade.

5. Single qubit gate operation for spin-QC using EDSR.

6. 2-qubit gate (CNOT) operations for spin QC.

7. Performing Deutsch-Josza and Grover search algorithm with a 2-qubit quantum register.

8. Characterize entanglement by quantum state tomography of Bell states.

9. Perform spin shuttling across the 4-qubit register.

Principal Investigator: Prof. Sai Vinjanampathy

Co-PI: Prof. Bhaskaran Muralidharan

Problems intended to be addressed by proposed project:

i. Define Quantum Advantage for Hybrid Thermal Machines

ii. Design Thermal Machines for Realistic Systems

iii. Information to Energy Conversion and Storage

iv. Optimal Quantum Thermal Machines

Principal Investigator: Prof. Debasis Sarkar

Co-PI: Dr. Indrani Chattopadhyay

The main goals in our study are:

1. To probe entanglement in different scenario and their relationship with different non-classical correlations.

2. To investigate the new resource coherence and then find its relationship with non-classical correlations, entanglement and beyond entanglement.

3. To investigate different resource theories with the nonlocal feature of quantum mechanics alongwith steering, etc.

4. Lastly, implementation of our results to different information processing tasks.

Principal Investigator: Prof. Indranil Sengupta

Co-PI: Prof. Kamalika Datta

The basic objectives of the project can be summarized as follows.

a) Scalable synthesis of quantum circuits with parallel gate operations using fault-tolerant gate library

b) Incorporation of error correcting code for reliable quantum gate operations

c) Development of strategies to limit propagation of errors during gate operations

d) Improving parallelization factor of fault-tolerant quantum circuits

e) Development of automated synthesis and optimization tools for fault tolerant quantum circuits

Principal Investigator: Prof. Apoorva Patel

Co-PI: Prof. Sanjit Chatterjee

Problems intended to be addressed by proposed project :

1. Development of efficient quantum algorithms have wide-ranging applications in quantum simulations, linear algebra, and design of optimal quantum systems suitable for a specific hardware. Advantages of wave dynamics can be exploited even in classical systems.

2. Development of (classical) cryptosystems that cannot be broken by known quantum algorithms will have many uses. Important areas are quantum-safe confidential communication, quantum-safe signature, and cryptanalysis of quantum communication protocols.

Principal Investigator: Prof. Madhu Thalakukam

Co-PI: Prof. Anil Shaji

The central problem to be addressed by the project is the construction of a viable, Silicon based, solid state few-qubit device which can function as a quantum information processor. Also in focus is the problem of transduction of quantum information from the solid-state quantum bits back and forth into states of the electromagnetic field. Achieving these objectives requires the development and mastery of several technologies and technologies concurrently meeting the interim goals listed among the deliverables. It also requires building new insight and theoretical understanding of several physical processes and phenomena ranging from decoherence and its control to the various means of coupling the solid-state devices to states of the electromagnetic field.

Principal Investigator: Prof. Anil Shaji

Co-PI: Prof. Madhu Thalakulam

Rapid progress in experimental access, control and manipulation at the quantum level makes it important to try and develop a comprehensive theoretical understanding of open quantum systems. A candid look at the field shows this understanding to be quite inadequate at best with even the basic form for a general nonMarkovian master equation unknown and with no general agreement on the conditions and justifications for having completely positive reduced dynamics of an open quantum system. The proposed project work is aimed at filling some of these gaps in our understanding of open quantum systems by roping in ideas and techniques from quantum information theory in attacking the problem. This approach is also expected to yield results in the reverse direction where quantum information processing protocols with improved performance can be designed based on a better understanding of the evolution of a quantum system in contact with its environment.