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Details of Grant 

EPSRC Reference: GR/R26689/01
Title: Development of a new NMR approach for quantum computing using 'pure' spin states derived from para hydrogen
Principal Investigator: Duckett, Professor S
Other Investigators:
Taylor, Professor R Halstead, Dr T Jones, Professor JA
Researcher Co-Investigators:
Project Partners:
Department: Chemistry
Organisation: University of York
Scheme: Standard Research (Pre-FEC)
Starts: 11 January 2002 Ends: 10 July 2004 Value (£): 194,886
EPSRC Research Topic Classifications:
Chemical Structure Quantum Optics & Information
EPSRC Industrial Sector Classifications:
No relevance to Underpinning Sectors
Related Grants:
Panel History:  
Summary on Grant Application Form
NMR has proved to be an ideal system for the development of quantum computing. However, the conventional NMR techniques currently used for this role do not scale well to larger systems (many qubits) because of the need to extract a pseudo-pure state from the highly mixed thermal equilibrium starting point. Indeed several authors have suggested that the method may be fundamentally flawed and actually represent the classical simulation of a quantum computer. We propose to make dramatic contributions to this area by using parahydrogen chemically to prepare pure spin states that exceed the entanglement threshold. The pure states will scale well to larger systems and provide access to real quantum computations. We will repeat key experiments using parahydrogen derived systems that have already been performed by conventional NMR methods. Such experiments include the creation of GHZ three-particle states, the operation of quantum gates, such as CNOT, and the implementation of simple algorithms such as the Deutsch-Jozsa algorithm and Grover's quantum search algorithm. We also propose to develop new experiments based around the abilities uniquely offered by parahydrogen We plan to develop a suitable synthetic and experimental methodology to back the technical measurement programme and will explore the multipole NMR formalism to enhance understanding of this approach. W e propose initially to limit our studies to 6 qubits but note if NMR is ever to work with larger, and computationally desirable, registers the generation of pure spin states is essential to keep the experiment times to within the physical relaxation threshold.
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Organisation Website: http://www.york.ac.uk