[plt-scheme] amb and Quantum Computation in Scheme

Readers of this group may be interested in the link: 
 
http://www.het.brown.edu/people/andre/qlambda/index.html
 
where I have implemented a quantum computing simulator in MzScheme.   

The simulator relies on a "quantum" version of McCarthy's 
nondeterministic "amb" operator.
 
Our version, called quamb, keeps track of a complex amplitude for each 
history in the quamb-tree, enabling the computation to branch into a 
"quantum superposition" of computations.   There is a macro called 
quantum-eval, which performs the quantum mechanical sum over histories. 
 
Regards
Andre