Dear Friends,
On Thursday, March 14, there will be an ITAMP topical lunch discussion.
Tea Room (P-226) @ CfA (60 Garden Street)
Time: 12:00-1:30
As always pizza will be served.
Speaker: Elie Wolfe (University of Connecticut)
Title: Superradiance does not lead to Entangled States
Abstract:
Superradiance is a phenomenon by which a collection of excited atoms
may decay coherently, briefly radiating much more intensely than would
be expected by independent random decay. We ask if superradiance,
modeled as a mixed state evolving over the highly entangled symmetric
Dicke states, leads to nonzero entanglement. Surprisingly the answer
is no. While we can quickly verify positivity under partial transpose
we had to develop a new technique – based on explicit separable
decomposition – to conclusively certify complete separability. Our
method of decomposition serves furthermore as a necessary and
sufficient entanglement test for any N-qudit mixed state diagonal in
the symmetric basis.
Looking forward to seeing you there,
Charles Mathy
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