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UID:6abfb52a6fca3
DTSTART:20261014T100000Z
SEQUENCE:0
TRANSP:OPAQUE
DTEND:20261014T110000Z
LOCATION:Seminar Room
SUMMARY:ICFO | SHUHENG LIU
CLASS:PUBLIC
DESCRIPTION:Wigner negativity and genuine multipartite entanglement (GME) a
 re key nonclassical resources that enable computational advantages and bro
 ader quantum-information tasks. In this work\, we prove two theorems for m
 ultimode continuous-variable systems that relate these nonclassical resour
 ces. Both theorems show that sufficient Wigner negativity&mdash\;either a 
 sufficiently-large Wigner negativity volume along a suitably-chosen two-di
 mensional slice\, or a sufficiently-large nonclassicality depth of the cen
 ter-of-mass mode of a system&mdash\;certifies the presence of GME. Moreove
 r\, violations of the latter inequality provide lower bounds of the trace 
 distance to the set of non-GME states. Our results also provide sufficient
  conditions for generating GME by interfering a state with the vacuum thro
 ugh a multiport interferometer\, complementing long-known necessary condit
 ions. Beyond these fundamental connections\, our methods have practical ad
 vantages for systems with native phase-space measurements: they require on
 ly measuring the Wigner function over a finite region\, or measuring a fin
 ite number of characteristic function points. Such measurements are freque
 ntly performed with readouts common in circuit/cavity quantum electrodynam
 ic systems\, trapped ions and atoms\, and circuit quantum acoustodynamic s
 ystems. As such\, our GME criteria are readily implementable in these plat
 forms.
DTSTAMP:20261002T134410Z
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