The science of quantum information has arisen over the last two decades centered on the
manipulation of individual quanta of information, known as quantum bits or qubits. Quantum …

No-cloning theorem is fundamental for quantum mechanics and for quantum information
science that states an unknown quantum state cannot be cloned perfectly. However, we can …

We propose two simple implementations of the optimal symmetric 1→ 2 phase-covariant
cloning machine for qubits. The first scheme is designed for qubits encoded into polarization …

The history of quantum cloning can be traced back to the controversial story of a paper by
Herbert [1982] entitled “FLASH–A superluminal communicator based upon a new kind of …

The distribution of the quantum states to remote receivers is an indispensable technology in
quantum communication, quantum networks, and quantum information processing. Perfect …

We report the first experimental demonstration of continuous variable cloning of phase-
conjugate coherent states as proposed by Cerf and Iblisdir [Phys. Rev. Lett. 87, 247903 …

The quantum fluctuations and correlations of the output signal and idler beams from a type-II
polarization nondegenerate optical parametric amplifier (NOPA) inside an optical cavity are …

The cloning of quantum variables with continuous spectra is investigated. We define a
Gaussian 1-to-2 cloning machine that copies equally well two conjugate variables such as …

This book is a self-contained guide to the world of quantum optical processes which
addresses different aspects relevant in quantum optics and quantum information. The basic …

An optimal universal cloning transformation is derived that produces M copies of an
unknown qubit from a pair of orthogonal qubits. For M> 6, the corresponding cloning fidelity …