Tomorrow's seminar

[CM ICTP - Trieste]

CONDENSED MATTER AND STATISTICAL PHYSICS SECTION
	
INFORMAL SEMINAR on

Disorder and strong electron correlations






Thursday, 20 April    -    11:00 a.m.




Room 239,  Main Bldg.- II floor




L. IOFFE   ( Rutgers State University of New Jersey, Piscataway )




"The challenge of error correction in quantum computation"


Abstract

I compare the software approach to the error correction in quantum 
computation to the hardware one in which the protection from errors is 
due to a proper choice of the microscopic Hamiltonian. I show that from 
the theoretical point of view the systems protected at the physical 
level are characterized by the topological order parameter.  I argue 
that neither the software correction nor this topological protection 
alone can be sufficient to achieve a stable computation with today 
technology.  The most promising approach seems to combine some level of 
hardware error correction that can be achieved in mesoscopic physical 
systems characterized by topological order parameter with the software 
error correction at a higher level.  I review the simplest spin models 
and the small size Josephson junction arrays that provide this 
protection and discuss the requirements on them imposed by the software 
error correction.