236 research outputs found
Physical implementation of entangling quantum measurements
We clarify the microscopic structure of the entangling quantum measurement
superoperators and examine their possible physical realization in a simple
three-qubit model, which implements the entangling quantum measurement with an
arbitrary degree of entanglement.Comment: 6 pages, 2 fihure
Generalized quantum measurements. Part I: Information properties of soft quantum measurements
A special class of soft quantum measurements as a physical model of the fuzzy
measurements widely used in physics is introduced and its information
properties are studied in detail.Comment: 25 pages, 3 figures, 25 ref
Coherent and compatible information: a basis to information analysis of quantum systems
Relevance of key quantum information measures for analysis of quantum systems
is discussed. It is argued that possible ways of measuring quantum information
are based on compatibility/incompatibility of the quantum states of a quantum
system, resulting in the coherent information and introduced here the
compatible information measures, respectively. A sketch of an information
optimization of a quantum experimental setup is proposed.Comment: 10 pages, 5 figures, submitted to the Procs of 17th Int'l Conf. on
Coherent and Nonlinear Optics (ICONO-2001), June 26-July 1, 2001, Minsk,
Belaru
Entangling quantum measurement and its properties
We study the mathematical structure of superoperators describing quantum
measurements, including the \emph{entangling measurement}--the generalization
of the standard quantum measurement that results in entanglement between the
measurable system and apparatus. It is shown that the coherent information can
be effectively used for the analysis of such entangling measurements whose
possible applications are discussed as well.Comment: 8 pages, 1 figure; accepted for publication in Phys. Rev.
- …