Quantum Engineering Grenoble Seminar || Quantum Computing || Ravi Kunjwal: "Contextuality in entanglement-assisted one-shot classical communication"

on the November 24, 2021

At 3pm
Quantum Engineering Grenoble Seminar Team is pleased to announce that the next QuEnG Quantum Computing seminar will be given by Ravi Kunjwal (Université libre de Bruxelles) on Wednesday 24 November at 3pm at LIG (room 406, IMAG building), as well as on Zoom as a hybrid event (link below) for those unable to attend in person.
Title: Contextuality in entanglement-assisted one-shot classical communication
Abstract: We consider the problem of entanglement-assisted one-shot classical communication. In the zero-error regime, entanglement can increase the one-shot zero-error capacity of a family of classical channels following the strategy of Cubitt et al., Phys. Rev. Lett. 104, 230503 (2010). This strategy uses the Kochen-Specker theorem which is applicable only to projective measurements. As such, in the regime of noisy states and/or measurements, it cannot increase the capacity. To accommodate generically noisy situations, we examine the one-shot success probability of sending a fixed number of classical messages. We show that preparation contextuality powers the quantum advantage in this task, increasing the one-shot success probability beyond its classical maximum. We then show a mapping between this communication task and a corresponding nonlocal game. This mapping generalizes the connection with pseudo-telepathy games previously noted in the zero-error case. Finally, after motivating a constraint we term context-independent guessing, we show that the contextuality witnessed by noise-robust noncontextuality inequalities obtained in R. Kunjwal, Quantum 4, 219 (2020), is sufficient for enhancing the one-shot success probability. This provides an operational meaning to these inequalities and the associated hypergraph invariant, the weighted max-predictability. The task of entanglement-assisted one-shot classical communication thus provides a fertile ground to study the interplay of the Kochen-Specker theorem, Spekkens contextuality, and Bell nonlocality. Based on arXiv:2006.00469.
Access (in person)
The seminar will take place in room at LIG, in room 406 of the IMAG building on the campus. Someone will wait in the entrance to provide attendees with access to the 4th floor. 
Zoom link + details:
Meeting ID: 985 1551 2137
Passcode: 436965
Published on November 23, 2021

Practical informations


on Zoom as a hybrid event (read on for details)