The manner in which states of some quantum systems become effectively classical is of
great significance for the foundations of quantum physics, as well as for problems of …

Quantum decoherence plays a pivotal role in the dynamical description of the quantum-to-
classical transition and is the main impediment to the realization of devices for quantum …

Over the course of the past decade, decoherence has become a ubiquitous scienti? c term
popular in all kinds of research, from fundamental theories of quantum physics to …

Various physical implementations of quantum computers are being investigated, although
the requirements that must be met to make such devices a reality in the laboratory at present …

We study the entanglement in the quantum Heisenberg XY model in which the so-called W
entangled states can be generated for 3 or 4 qubits. By the concept of concurrence, we study …

Universal quantum computation on decoherence-free subspaces and subsystems (DFSs) is
examined with particular emphasis on using only physically relevant interactions. A …

By investigating information flow between a general parity-time (PT-) symmetric non-
Hermitian system and an environment, we find that the complete information retrieval from …

Any physical process can be represented as a quantum channel map** an initial state to a
final state. Hence it can be characterized from the point of view of communication theory, ie …

We demonstrate a decoherence-free quantum memory of one qubit. By encoding the qubit
into the decoherence-free subspace (DFS) of a pair of trapped 9Be+ ions, we protect the …

We present a review of theoretical and experimental aspects of multiphoton quantum optics.
Multiphoton processes occur and are important for many aspects of matter–radiation …