Entanglement Generation from Thermal Spin States via Unitary Beam Splitters

Abstract

We suggest a method of generating distillable entanglement form mixed states unitarily, by utilizing the flexibility of dimension od occupied Hilbert space. We present a model of a thermal spin state entering a beam splitter generating entanglement. It is the truncation of the state that allows for entanglement generation. The output entanglement is investigated for different temperatures and it is found that more randomness - in the form of higher temperature - is better for this set up.

4 pages, 3 figures. Small changes in accordance with journal advice to make more readable. Improved discussion on implemetability of scheme, and references added