We report a new method to determine the orientation of individual nitrogen-vacancy (NV)
centers in a bulk diamond and use them to realize a calibration-free vector magnetometer …

We present a quantum sensing technique that utilizes a sequence of π pulses to cyclically
drive the qubit dynamics along a geodesic path of adiabatic evolution. This approach …

Small, controllable quantum systems, known as quantum probes, have been proposed to
estimate various parameters characterizing complex systems such as the environments of …

We investigate the effect of initial system-environment correlations to improve the estimation
of environment parameters. By employing various physical situations of interest, we present …

We study the impact of quantum correlations existing within the system-environment thermal
equilibrium state while estimating the parameters of the spin reservoir. By employing various …

We demonstrate how using two qubits can drastically improve the estimation of environment
parameters compared to using only a single qubit. The two qubits are coupled to a common …

Accurate population transfer of uncoupled or weakly coupled spin states is crucial for many
quantum-information-processing tasks. In this paper, we propose a fast and robust scheme …

This thesis presents studies performed on open quantum systems, that is, quantum systems
interacting with their surrounding environment. Such systems are important not only in …

For spins chains to be useful for quantum information processing tasks, the interaction
between the spin chain and its environment generally needs to be suppressed. In this paper …

Projective measurement is a popular method of initial state preparation, which always
prepares a pure state. However, in various physical situations of interest, this selective …