1 - 10 of 18 articles
Selection of an ensemble of equally prepared quantum systems, based on measurements on it, is a basic step in quantum state purification. For an ensemble of single qubits, iterative application of selective dynamics has been shown to lead to complex chaos, which is a novel form of quantum chaos...
We examine a quantum system that can be led to chaotic behaviour. It comprises a quantum nonlinear oscillator excited by a series of ultra-short coherent pulses. We show that the fidelity of quantum states decay can be a signature of quantum chaotic behaviour of the considered system.
We discuss the possibility of application of the Wigner function as an indicator of quantum chaos. As an example we consider the system comprising a nonlinear oscillator permanently perturbed by a series of ultrashort external pulses. We show, that non-classicality parameter based on the Wigner...
We propose an application of the cellular automata method to a system containing many two-level subsystems similar to those governed by the Bloch vector. They are located inside one cavity and emit (or absorb) quanta of energy. We show that the system is sensitive to the probabilities of the...
An expression for the average time of arrival of a free particle, to a given small part of space, is derived using the Wigner phase space formulation of quantum mechanics. Special care is paid to the case of the one-dimensional motion. It is shown that infinite values for average times of...
We review how to obtain spin entangled pairs of fermions from a Fermi gas. An experiment with neutrons is proposed in order to get such pairs.
We present an optical scheme for the recently proposed protocol for encoding arbitrary non-entangled states of two qubits into a state of one qutrit. Our experimental realization uses spatial-mode encoding. Each qudit is thus represented by a single photon propagating in d different optical...
We analyze and compare the optimality of approximate and probabilistic universal programmable quantum processors. We define several characteristics how to quantify the optimality and we study in detail performance of three types of programmable quantum processors based on 1) the C-NOT gate, 2)...
We describe an optical scheme for optimal Gaussian n→m cloning of coherent states. The scheme, which generalizes a recently demonstrated scheme for 1→2 cloning, involves only linear optical components and homodyne detection.
We propose to use Stokes parameter as an entanglement witness for correlated EPR mixed states of light. Such states can be generated with a beam splitter acting on two mixed squeezed states of light. Stokes witness operators are closely related to the Hanbury-Brown and Twiss interference and can...
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