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SUMMARY:Molecules and spins for quantum technologies (Prof. G. A. D. Brigg
 s\, University of Oxford) - Prof. G. A. D. Briggs\, Department of Material
 s\, University of Oxford
DTSTART:20140310T140000Z
DTEND:20140310T150000Z
UID:TALK50698@talks.cam.ac.uk
CONTACT:Dr. Jonathan D. Mar
DESCRIPTION:Carbon and silicon materials can support quantum superposition
  and entanglement for practical technologies. Superposition incorporates a
  phase with information content surpassing any classical mixture. Entangle
 ment offers correlations stronger than any which would be possible classic
 ally. Together these give quantum computing its spectacular potential\, bu
 t earlier applications may be found in metrology and sensing. Quantum inte
 rference in molecules offers low power switches and thermovoltaic energy s
 cavenging.\n\nCarbon nanomaterials can be structurally characterised with 
 resolution approaching half the length of a carbon-carbon bond. Fullerene 
 molecules can be assembled in carbon materials for quantum technologies. N
 @C60 contains a single nitrogen atom in a cage of sixty carbon atoms\, who
 se spin superposition states are coherent for hundreds of microseconds. Ot
 her endohedral fullerenes can be almost as good. Information can be transf
 erred from electron to nuclear spins and back again to give even longer me
 mory times\, and can be stored and retrieved holographically in collective
  spin states. Small tip-angle excitations can be used to demonstrate many 
 of the fundamental principles. Correlated spins can be used for magnetic f
 ield sensors that surpass the standard quantum limit. Devices can be made 
 with sensitivity to a coupled electron spin. In silicon entanglement has b
 een demonstrated between electron and nuclear spins\, and remarkably long 
 coherence times are possible.\n\nThe big development over the next five ye
 ars in materials for quantum technologies will be a transition from ensemb
 les to devices. Many of the ingredients are already available: atomic-scal
 e fabrication and characterization of materials\, theoretical designs for 
 architectures\, exquisite control of electron and nuclear spins\, and meas
 urement of spin states [1]. The challenge ahead is to harness these togeth
 er in devices with hierarchies of memory times and of controllability. The
  materials and techniques for quantum technologies also provide the means 
 to investigate foundational quantum questions such as realism in the Legge
 tt-Garg inequality\, which in turn stretch the bounds of non-classical beh
 aviour for technology.\n\n[1] Ardavan\, A. & Briggs\, G. A. D. Quantum con
 trol in spintronics. Phil. Trans R. Soc. A 369\, 3229-3248\, doi:10.1098/r
 sta.2011.0009 (2011).
LOCATION:Pippard Lecture Theatre\, Bragg Building\, Cavendish Laboratory (
 Physics Department)
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