Alladi Ramakrishnan Hall

Manifestation of Entanglement in Quantum Foundations and Thermodynamics

Arpan Das

IOP - Bhubaneswar

This talk is mainly divided into two parts. In the first part,
I will be talking about Entanglement, Bell nonlocality and explore the
interplay between them in the multipartite scenario. Specifically, I
constructed new Bell inequalities for multiqubit system mainly designed
for generalized GHZ states, which do not violate any correlation Bell
inequalities (for two dichotomic measurements for each party) for a
certain parameter range. Our motivation was to have Bell inequalities,
which would show a violation for every generalized GHZ state. We also
studied different aspects of these inequalities including their
connections with multipartite entanglement. I will also be discussing a
QIP protocol called co-operative QKD and the structure of the resource
states for this protocol.
In the second part of my talk, I will be discussing the role of Quantum
correlations in Quantum Thermodynamics, which is still far from fully
understood. Specifically, I consider the role of entanglement for a
single temperature quantum heat engine without feedback control,
introduced recently by Talkner and Kim [Phys. Rev. E 96, 022108 (2017)].
We take the working medium of the engine to be a 1-dim Heisenberg model
of two spins. We calculate the efficiency of the engine undergoing a
cyclic process at a single temperature and show that for a coupled
working medium the efficiency can be higher than that of an uncoupled
one.