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UID:da7da8dd-df91-4149-af9e-6526f6a5dfb8@nexttoyou
DTSTAMP:20261106T171158Z
DTSTART:20261113T170000Z
DTEND:20261113T180000Z
SUMMARY:YQI Colloquium - Mohamed Bourennane - Stockholm University
LOCATION:17 Hillhouse Avenue YQI Seminar Room\, 17 Hillhouse Avenue\, New 
 Haven\, CT 06511
DESCRIPTION:Title: Quantum Random Access Codes: From Nonclassicality to Ap
 plications\n\nAbstract:\n\nA random-access code is a simple communication
  game. A sender encodes several pieces of information into a single messa
 ge\, and a receiver must decode whichever piece is requested\, without th
 e sender knowing which one in advance. Using a quantum system as the mess
 age gives a success rate that no classical encoding of the same size can 
 match\, even though Holevo’s bound limits how much information the system
  can carry. This gap makes quantum random access codes (QRACs) both a res
 ource for communication tasks and a sensitive probe of what is genuinely 
 quantum. In this colloquium\, I will introduce QRACs and follow them thro
 ugh a series of photonic experiments. We first extend them from qubits to
  single d-level systems\, where the quantum advantage persists in high di
 mensions. We then compare quantum communication with shared entanglement 
 as resources for random access coding and find that the two are complemen
 tary rather than interchangeable. Turning to foundations\, I will show ho
 w QRAC-type games reveal preparation contextuality\, characterise unsharp
  qubit measurements\, and certify measurement incompatibility when severa
 l receivers measure in sequence. On the practical side\, using more input
 s and better post-processing increases the amount of semi-device-independ
 ent randomness that can be certified. I will end at the card table. In th
 e bidding phase\, partners must convey as much as possible about \n\nhttp
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