Remarks on 2-q-bit states

Preprint

17 July 2000

preprint
Published by arXiv in arXiv

https://doi.org/10.48550/arXiv.quant-ph/0007053

Abstract

We distinguish six classes of families of locally equivalent states in a straightforward scheme for classifying all 2-q-bit states; four of the classes consist of two subclasses each. The simple criteria that we stated recently for checking a given state's positivity and separability are justified, and we discuss some important properties of Lewenstein-Sanpera decompositions. An upper bound is conjectured for the sum of the degree of separability of a 2-q-bit state and its concurrence.

Keywords

LOCALLY EQUIVALENT
LEWENSTEIN SANPERA
EQUIVALENT STATES
DISTINGUISH SIX
SIMPLE CRITERIA
SEPARABILITY
SIX CLASSES
BIT STATES
STATES

All Related Versions

Version 1, 2000-07-17, ArXiv
Published version: Applied Physics B Laser and Optics, 72 (1), 35.

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