Pramana

, Volume 59, Issue 2, pp 243–254

Developments in quantum information processing by nuclear magnetic resonance: Use of quadrupolar and dipolar couplings

Authors

    • Department of PhysicsIndian Institute of Science
    • Sophisticated Instruments FacilityIndian Institute of Science
  • K V Ramanathan
    • Sophisticated Instruments FacilityIndian Institute of Science
  • T S Mahesh
    • Department of PhysicsIndian Institute of Science
  • Neeraj Sinha
    • Department of PhysicsIndian Institute of Science
  • KVRM Murali
    • Department of PhysicsIndian Institute of Science
Proceedings Of The Second Winter Institute On Foundations Of Quantum Theory And Quantum Optics

DOI: 10.1007/s12043-002-0114-4

Cite this article as:
Kumar, A., Ramanathan, K.V., Mahesh, T.S. et al. Pramana - J Phys (2002) 59: 243. doi:10.1007/s12043-002-0114-4

Abstract

Use of dipolar and quadrupolar couplings for quantum information processing (QIP) by nuclear magnetic resonance (NMR) is described. In these cases, instead of the individual spins being qubits, the 2 n energy levels of the spin-system can be treated as an n-qubit system. It is demonstrated that QIP in such systems can be carried out using transition-selective pulses, in CH3CN, 13CH3CN, 7Li (I=3/2) and 133Cs (I=7/2), oriented in liquid crystals yielding 2 and 3 qubit systems. Creation of pseudopure states, implementation of logic gates and arithmetic operations (half-adder and subtractor) have been carried out in these systems using transition-selective pulses.

Keywords

Quantum information processing qubit nuclear magnetic resonance quantum computing

PACS No

03.67.-a

Copyright information

© Indian Academy of Sciences 2002