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UID:6a2b721cb335c
DTSTART:20240510T100000Z
SEQUENCE:0
TRANSP:OPAQUE
DTEND:20240510T110000Z
LOCATION:Blue Lecture Room 
SUMMARY:ICFO | VICTORIA WRIGHT 
CLASS:PUBLIC
DESCRIPTION:I will present a work in-preparation in which we derive semi-de
 vice-independent security proofs for prepare-and-measure QKD protocols. Wi
 tnessing a contextual correlation can provide a semi-device-independent ce
 rtification of entropy between the trusted parties and any eavesdropper in
  a prepare-and-measure protocol. However\, witnessing preparation-contextu
 al correlations in an experiment requires one to assume that some preparat
 ion equivalence (such as basis independence) is exactly satisfied. Since i
 t is impossible to prepare an exact quantum state\, this requirement prese
 nts a problem. We navigate this problem by demonstrating that there always
  exists a set of hypothetical extra states that would augment a collection
  of imperfectly prepared quantum states such that they satisfy an exact eq
 uivalence. Under the connection between generalised contextuality and Bell
  non-locality\, these extra states correspond to a no-click outcome for ea
 ch of one party's measurements in the relevant Bell scenario. This hypothe
 tical no-click would occur with probability bounded by the closeness of th
 e imperfectly prepared states to their targets in the prepare-and-measure 
 experiment. Using known entropy bounds from Bell inequality violations\, w
 e can then derive key rates for our protocol secure against collective att
 acks using observed statistics. We are studying under which assumptions th
 ese bounds can be combined with the generalised entropy accumulation theor
 em to give security against coherent attacks.
DTSTAMP:20260612T024236Z
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