The impossibility of perfectly copying (or cloning) an unknown quantum state is one of the
basic rules governing the physics of quantum systems. The processes that perform the …

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 a generalized discrimination scheme for mixed quantum states. In the present
scenario we allow for certain fixed fraction of inconclusive results and we maximize the …

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 …

We investigate the optimal distribution of quantum information over multipartite systems in
asymmetric settings. We introduce cloning transformations that take N identical replicas of a …

We investigate the probabilistic cloning and purification of quantum states. The performance
of these probabilistic operations is quantified by the average fidelity between the ideal and …

We propose a quantum device that can approximate any projective measurement on a qubit—
a quantum “multimeter.” The desired measurement basis is selected by the quantum state of …

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 …

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 …

In this work, we extensively study the problem of broadcasting of quantum correlations
(QCs). This includes broadcasting of quantum entanglement as well as correlations that go …