Details of Grant 

EPSRC Reference:	GR/L97513/01
Title:	ENTANGLEMENT AND QUANTUM INFORMATION PROCESSING
Principal Investigator:	Knight, Professor Sir P
Other Investigators:
Researcher Co-Investigators:
Project Partners:
Department:	Physics
Organisation:	Imperial College London
Scheme:	Standard Research (Pre-FEC)
Starts:	01 July 1998	Ends:	31 December 2001	Value (£):	131,388
EPSRC Research Topic Classifications:	Atoms & Ions Quantum Optics & Information
EPSRC Industrial Sector Classifications:	No relevance to Underpinning Sectors
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Panel History:
Summary on Grant Application Form
Quantum information is a rapidly growing field of great importance for quantum theory, and of great potential importance for quantum computation and communication. The advantage of quantum computation and communication derives from entanglement and the superposition principle: a quantum system, unlike its classical counterpart, can be in a coherent superposition f its basis states. The proposed research involves the properties of entanglement of quantum subsystems in a joint state, and dynamical changes through interaction with an environment. We need to advance out understanding of measures of entanglement, and finding optimal operational procedures through which entanglement can be quantified. This will help us define entangled states for multiparticle systems, useful in multi-user cryptographic schemes. We will consider how entanglement changes in decohering dissipative environments. Decoherence and dissipation destroy coherence in a quantum computer, leading to no advantages over classical computation. Formally, an environment can be treated as a noisy quantum channel through which the system passes. We will use our entanglement measures to define quantum channel capacity and investigate how it may be increased using quantum error correction. Practical applications will involve frequency standards schemes. Work on non-classical states of laser-cooled ions will be pursued as potential vehicles to study such effects.
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Organisation Website:	http://www.imperial.ac.uk