Entanglement purification of Gaussian continuous variable quantum states

Authors
Duan, LM Giedke, G Cirac, JI Zoller, P
Citation
Lm. Duan et al., Entanglement purification of Gaussian continuous variable quantum states, PHYS REV L, 84(17), 2000, pp. 4002-4005
Citations number
24
Categorie Soggetti
Physics
Journal title
PHYSICAL REVIEW LETTERS
ISSN journal
00319007 → ACNP
Volume
84
Issue
17
Year of publication
2000
Pages
4002 - 4005
Database
ISI
SICI code
0031-9007(20000424)84:17<4002:EPOGCV>2.0.ZU;2-Z
Abstract
We describe an entanglement purification protocol to generate maximally ent angled states with high efficiencies from two-mode squeezed states or from mixed Gaussian continuous entangled states. The protocol relies on a local quantum nondemolition measurement of the total excitation number of several continuous variable entangled pairs. We propose an optical scheme to do th is kind of measurement using cavity enhanced cross-Kerr interactions.