Spin is In

At IBM they ought to know
What makes a fast computer go.
They seem to think electron spin
Is something worth investing in.


Today's computers, by and large,
Rely upon electron charge.
But we might speed them up a lot
With spins inside a quantum dot.


We'd like to put a qubit there
And tickle it with extra care.
Alas, it isn't very clear
How fast the spin will decohere.


Today we'll hear from Dave DiVince.
In '96, and ever since
He's been for spin in his preprints.
Let's see if you will be convinced.


                            John Preskill

                            February 28, 2002