Feb 28, 2001
Physical Realizations of Quantum Bits: Trapped Ions and Cooper Pair Boxes
Dr. Steven Girvin, ITP & Indiana University
The problem of engineering a quantum computer is extremely daunting.
However, the physics of why this will be difficult is interesting in its own
right. As just one example, quantum phase coherence can decay even in the
absence of energy relaxation. This talk will be a simple introduction to two
physical realizations of quantum bits which have already been successfully
demonstrated. The first involves spins of ions held in a trap and the second
involves fabrication of mesoscopic superconductors so small that addition of
a single electron costs a significant amount of energy.
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