3,107 research outputs found
Exactly Solvable Many-Body Systems and Pseudo-Hermitian Point Interactions
We study Hamiltonian systems with point interactions and give a systematic
description of the corresponding boundary conditions and the spectrum
properties for self-adjoint, PT-symmetric systems and systems with real
spectra. The integrability of one dimensional many body systems with these
kinds of point (contact) interactions are investigated for both bosonic and
fermionic statistics.Comment: 7 page
Measurable bounds for Entanglement of Formation
We study the entanglement of formation for arbitrary dimensional bipartite
mixed unknown states. Experimentally measurable lower and upper bounds for
entanglement of formation are derived.Comment: 9 pages, 4 figure
A Remark on the Optimal Cloning of An N-Level Quantum System
We study quantum cloning machines (QCM) that act on an unknown N-level
quantum state and make M copies. We give a formula for the maximum of the
fidelity of cloning and exhibit the unitary transformations that realize this
optimal fidelity. We also extend the results to treat the case of M copies from
() identical N-level quantum systems.Comment: 8 pages, Late
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