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5 papers · 1 filter
Entanglement of Formation of an Arbitrary State of Two Qubits
William K. Wootters
The entanglement of a pure state of a pair of quantum systems is defined as the entropy of either member of the pair. The entanglement of formation of a mixed state is defined as t…
A New Look At Carbon Abundances In Planetary Nebulae. III. DDDM1, IC 3568, IC4593, NGC 6210, NGC 6720, NGC 6826, & NGC 7009
K. B. Kwitter, R. B. C. Henry
This paper is the third in a series reporting on a study of carbon abundances in a carefully chosen sample of planetary nebulae representing a large range in progenitor mass and me…
On the Origin of Planetary Nebula K648 in Globular Cluster M15
J. F. Buell, R. B. C. Henry, E. Baron +1
We examine two scenarios for formation of the planetary nebula K648: a prompt scenario where the planetary nebula is ejected and formed immediately after a helium shell flash and a…
Planetary Nebula Abundances, Stellar Yields, And The Galactic Evolution of C-12 and N-14
R. B. C. Henry, K. B. Kwitter, J. Buell
A project which aims to understand the abundance patterns of He, C, N, O, Ne, S, and Ar for a small sample of planetary nebulae is described. Abundance ratios of O/H, C/O, and N/O…
Entanglement of a Pair of Quantum Bits
Scott Hill, William K. Wootters
The ``entanglement of formation'' of a mixed state of a bipartite quantum system can be defined in terms of the number of pure singlets needed to create the state with no further t…