Dear group,
Here is an interesting e-mail description of a paper by from my friend
Rogerio de Sousa, in particular interesting if we want to look into
why the adabatic QC of D-wave is working or might work.
Alan
I have a nice new paper (single author) that is just
about to appear in
PRB (cond-mat/0610716). I showed that the dominant source of magnetic
noise in superconductor and semiconductor devices comes from the dangling
bond spin-flips at the oxide interface. This led to a surprising
connection: I showed that the mechanism of decoherence of SQUID qubits as
well as spin qubits (in silicon without nuclear spins) is the same! The
amount of magnetic 1/f noise calculated by my theory seems to agree both
with spin resonance data of impurities in silicon as well as with magnetic
flux noise data in superconducting devices.