Quantum Cryptography

Alice said to her friend Eve,

"Why do you practice to deceive?

You know I need to talk to Bob.

Without that I won't have a job.

"Bob can't know where my note has been.

He thinks that you are listening in.

He wonders if it's safe enough

For me to send him secret stuff.

"And Bob's right not to trust you, Eve,

With quantum tricks stuffed up your sleeve.

But he thinks we can freeze you out,

With quantum tricks we've learned about.

"With quantum states, what we achieve

Defeats whatever you conceive.

So even Bob has to believe

That you can’t hear us, can you Eve?"

                            John Preskill

                            November 1, 2001

Note: Attempts to find suitable rhymes for "Daniel Gottesman"

were unsuccessful. For example:

My cocker spaniel's spotless when

He's bathed by Daniel Gottesman.

Or:

When the weather's hottest, then

I call for Daniel Gottesman.

My apples look less spotted when

Daniel eats the rottenest ten.