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Can We Obtain Quantum Theory From Reasonable Axioms?
Lucien Hardy
See quant-ph/0101012
Universal Manipulation of a Single Qubit
Lucien Hardy, David D. Song
We find the optimal universal way of manipulating a single qubit, |psi(theta,phi)>, such that (theta,phi)->(theta-k,phi-l). Such optimal transformations fall into two classes. For…
Local Distinguishability of Multipartite Orthogonal Quantum States
Jonathan Walgate, Anthony J. Short, Lucien Hardy +1
We consider one copy of a quantum system prepared in one of two orthogonal pure states, entangled or otherwise, and distributed between any number of parties. We demonstrate that i…
Entanglement Swapping Chains for General Pure States
Lucien Hardy, David D. Song
We consider entanglement swapping schemes with general (rather than maximally) entangled bipartite states of arbitary dimension shared pairwise between three or more parties in a c…
Quantum Anti-Cloning
David D. Song, Lucien Hardy
We derive the transformation for the optimal universal quantum anti-cloner which produces two anti-parallel outputs for a single input state. The fidelity is shown to be 2/3 which…
Cloning and quantum computation
Ernesto F. Galvao, Lucien Hardy
We discuss how quantum information distribution can improve the performance of some quantum computation tasks. This distribution can be naturally implemented with different types o…