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quant-ph2001
Why Quantum Theory?
Lucien Hardy
The usual formulation of quantum theory is rather abstract. In recent work I have shown that we can, nevertheless, obtain quantum theory from five reasonable axioms. Four of these…
quant-ph2001
Substituting a qubit for an arbitrarily large number of classical bits
Ernesto F. Galvao, Lucien Hardy
We show that a qubit can be used to substitute for an arbitrarily large number of classical bits. We consider a physical system S interacting locally with a classical field phi(x)…
quant-ph2001
Quantum Theory From Five Reasonable Axioms
Lucien Hardy
The usual formulation of quantum theory is based on rather obscure axioms (employing complex Hilbert spaces, Hermitean operators, and the trace rule for calculating probabilities).…