Karam Chand Email & Phone Number

Mawson Lakes, South Australia, Australia

Edinburgh, South Australia, Australia

Complex systems engineering

Dhahran, Saudi Arabia

Nil..

Unsw Canberra

Research: Quantum channels can be used to transfer classical and quantum information. The capacity of a quantum channel is defined by the upper bound of it transmission rate. The capacity improvement of a quantum channel remains an open question. Have investigated the quantum channel capacity in spectral domain under stringent constrained resources, particularly photons, which is than apportioned in more realistic circumstances.Here theoretically, have used a classical signal analysis methodology to match the power spectral desnity(PSD) of the signal to the spectrum of a squeezed channel supported by a sub-threshold OPO. Using the classical water-filling algorithm, have defined and declared the first time, the upper bound of the channel capacity of a quantum channel under realistic practical assumptions. Following on from that, we have established the best signal-to-noise ratio and bit-error-rate that can be achieved for a bipolar non-return to zero digital signals imposed on the squeezed output of a sub-threshold OPO, given a fixed number of photons in the channel. For a range of parameters, we have also established circumstances under which the squeezed channel will perform better than a classical channel (as supported by a coherent state).The key outcome of this work lies in the understanding of how to optimize the capacity of a quantum channel for a given photon flux in the channel. It also provides the machinery needed to design experiments that would demonstrate quantum enhancement. We have also considered mismatched parameter regime, where increasing squeezing level hurts the quantum enhancement.Quantum Optics Engineering:Optical Parametric Oscillators.Optical Mode Cleaners.LASER optics design and coupling.Homodyne measurement optical and electronics design. Laser safety and risk mitigation methods.

Complex systems engineering

Development of embedded systems using WCDMA networks.

Formulation of strategic plans for migration to IP enabled next generation network, including transition plans for network and services.

In Progress, Quantum Optics

Beng(Hon), Electronics