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Controlling the flow of information in quantum cloners: Asymmetric cloning
V. Buzek, M. Hillery, R. Bednik
We show that the distribution of information at the output of the quantum cloner can be efficiently controlled via preparation of the quantum cloner. We present a universal cloning…
Quantum theory of dispersive electromagnetic modes
P. D. Drummond, M. Hillery
A quantum theory of dispersion for an inhomogeneous solid is obtained, from a starting point of multipolar coupled atoms interacting with an electromagnetic field. The dispersion r…
Quantum secret sharing
M. Hillery, V. Buzek, A. Berthiaume
Secret sharing is a procedure for splitting a message into several parts so that no subset of parts is sufficient to read the message, but the entire set is. We show how this proce…
Field Oscillations in a Micromaser with Injected Atomic Coherence
Mark Hillery, Jozef Skvarcek
The electric field in a lossless, regularly-pumped micromaser with injected atomic coherence can undergo a period 2 oscillations in the steady state. The field changes its value af…
Universal optimal cloning of qubits and quantum registers
Vladimir Buzek, Mark Hillery
We review our recent work on the universal (i.e. input state independent) optimal quantum copying (cloning) of qubits. We present unitary transformations which describe the optimal…