QUANTUM INFORMATION PROCESSING BY NMR: PREPARATION OF PSEUDOPURE STATES AND IMPLEMENTATION OF UNITARY OPERATIONS IN A SINGLE-QUTRIT SYSTEM
Ranabir Das, Avik Mitra, Santosh Kumar, Anil Kumar · International Journal of Quantum Information · 2003
Theoretical Quantum Information Processing (QIP) has matured from the use of qubits to the use of qudits (systems having states >2). Whereas most of the experimental implementations have been performed using qubits, little experimental work has been carried out using qudits as yet. In this paper we demonstrate experimental realization of a qutrit system by nuclear magnetic resonance (NMR), utilizing deuterium (spin-1) nuclei partially oriented in liquid crystalline phase. Preparation of pseudopure states and implementation of unitary operations are demonstrated in this single-qutrit system, using transition selective pulses.