3 papers
quant-ph2008
New aspects of the purity and information of an entangled qubit pair
Nasser Metwally
In this article, we investigate the purity dynamics of entangled 2 two-level atoms interacting with a single quantized electromagnetic field. We show that the purity of the qubit p…
quant-ph2008
A paradigm for entanglement and information swapping of two qubits
Nasser Metwally, Mahmoud Abdel-Aty
Based on a general unitary operation of two-qubit system, we investigate the dynamics of entanglement, entropy and purity. Distinctive features in the different initial states sett…
quant-ph2001
A more efficient variant of the Oxford protocol
Nasser Metwally
An alternative presentation of the Oxford purification protocol is obtained by using dynamical variables. I suggest to introduce the degree of separability as a purification parame…