Regional vs global operations: Quantum battery and state discrimination tasks

Regional vs global operations: Quantum battery and state discrimination tasks

Seminar author:Kornikar Sen

Event date and time:03/23/2023 04:00:pm

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We will consider energy extraction from quantum batteries and quantum
state discrimination by using local quantum operations. Considering a
two-party quantum battery comes with the dichotomy between choosing global
and local measurements, since the former provides more energy but the
latter is cheaper. We introduce the concept of local passivity for shared
quantum batteries with local Hamiltonians and characterise the set of all
locally passive battery states. For generic battery states, whether
noiseless or noisy, we find that the relationship between energy
extractions by local and global operations is closely related to the
entanglement content.

The relation between incompatibility of measurements and quantum state
discrimination tasks is well explored in the context of global operations.
We examine the same by considering state discrimination using local
operations and classical communication.