SAMOP 2023 – scientific programme

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QI: Fachverband Quanteninformation

QI 34: Concepts and Methods III

QI 34.4: Talk

Friday, March 10, 2023, 11:45–12:00, B302

Entanglement Batteries — •Ye-Chao Liu, Otfried Gühne, and Stefan Nimmrichter — Universität Siegen, Siegen, Germany

Quantum entanglement is an essential resource for many kinds of applications like quantum communication over a quantum network, eventually realizing the quantum internet. The unavoidable noise and losses between the links call for additional hardware that can gradually build up and store entanglement for later use -- an entanglement battery.

In this contribution, we introduce the concept of entanglement batteries charged by repeated interactions with a provided stream of Bell pairs. We show that, although perfect SWAP and iSWAP gates can both fully charge entanglement batteries using Bell states, their behaviors differ significantly if the charging interaction strength is restricted to a partial swap or even fluctuates. We compare two exemplary charging protocols: one that repeatedly uses a single Bell state for charging, and another one that uses a fresh Bell state for each charging step. We further assess the performance of entanglement charging under losses.