5–11 Jun 2022
McMaster University
America/Toronto timezone
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(G*) Channel capacity of relativistic quantum communication with rapid interaction

8 Jun 2022, 11:45
15m
MDCL 1008 (McMaster University)

MDCL 1008

McMaster University

Oral Competition (Graduate Student) / Compétition orale (Étudiant(e) du 2e ou 3e cycle) Theoretical Physics / Physique théorique (DTP-DPT) W1-2 Quantum Theory (DTP) | Théorie quantique (DPT)

Speaker

Kensuke Gallock Yoshimura

Description

We study nonperturbatively the transmission of classical and quantum information in globally hyperbolic spacetimes, where the communication channel is between two qubit detectors interacting with a quantized massless scalar field via delta-coupling interaction. This interaction approximates very rapid detector-field interaction, effectively occurring at a single instant in time for each detector. We show that when both detectors interact via delta-coupling, one can arrange and tune the detectors so that the channel capacity is (at least) as good as the quantum channel constructed nonperturbatively using gapless detectors. Furthermore, we prove that this channel capacity is in fact optimal, i.e., both nonperturbative methods give essentially the same channel capacity, thus there is a sense in which the two methods can be regarded as equivalent as far as relativistic quantum communication is concerned.

Primary author

Erickson Tjoa (University of Waterloo)

Co-author

Kensuke Gallock Yoshimura

Presentation materials

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