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Entanglement Swapping as Event‐Ready Entanglement Preparation
Author(s) -
Kok Pieter,
Braunstein Samuel L.
Publication year - 2000
Publication title -
fortschritte der physik
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.469
H-Index - 71
eISSN - 1521-3978
pISSN - 0015-8208
DOI - 10.1002/(sici)1521-3978(200005)48:5/7<553::aid-prop553>3.0.co;2-k
Subject(s) - quantum entanglement , photon entanglement , multipartite entanglement , squashed entanglement , photon , physics , event (particle physics) , beam splitter , w state , quantum metrology , quantum mechanics , quantum , quantum discord , laser
In this contribution the preparation of event‐ready entanglement in polarised photons by means of entanglement swapping is studied. This protocol makes use of Gaussian photon‐sources. Since the states resulting from this protocol are equivalent to those obtained by mixing two photons in a 50:50 beam splitter, the nature of the emerging entanglement is controversial. Several methods to enhance the fidelity of the outgoing state are studied. It is found that at least quantum non‐demolition measurements or a quantum computer of some kind is needed to create event‐ready entanglement with entanglement swapping.