Contact Info
Department of Applied Mathematics
University of Waterloo
Waterloo, Ontario
Canada N2L 3G1
Phone: 519-888-4567, ext. 32700
Fax: 519-746-4319
PDF files require Adobe Acrobat Reader
MC 5136
Robert Jonsson, Department of Applied Mathematics, University of Waterloo
Relativistic Quantum Communications
Since their discovery, General Relativity and Quantum Theory revolutionized not only our view of the world but by means of the digital revolution, in fact, our everyday life as well. However the problem of unifying these two successful theories remains unsolved for over half a century by now.
In recent years an approach called Relativistic Quantum Information has produced many interesting results by connecting quantum and relativistic effects through Information Theory. Following this idea, we study the communication between simple quantum systems that are connected via quantum fields, so called Unruh-DeWitt detectors, in relativistic settings. This model may serve as a general toy model, e.g., for signalling between atoms via the exchange of photons in curved spacetimes.
In this talk, we discuss the general structure of the quantum channel between two Unruh-DeWitt detectors. We show why Alice should not try to encode messages to Bob using energy eigenstates of her detector, but why she should use superposition states instead. Furthermore, we discuss recent work, where the quantum channel was applied to quantum field in cavities. Using causality arguments the fidelity of approximative methods, that only use a finite number of modes, was investigated in relativistic scenarios.
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Contact Info
Department of Applied Mathematics
University of Waterloo
Waterloo, Ontario
Canada N2L 3G1
Phone: 519-888-4567, ext. 32700
Fax: 519-746-4319
PDF files require Adobe Acrobat Reader
The University of Waterloo acknowledges that much of our work takes place on the traditional territory of the Neutral, Anishinaabeg and Haudenosaunee peoples. Our main campus is situated on the Haldimand Tract, the land granted to the Six Nations that includes six miles on each side of the Grand River. Our active work toward reconciliation takes place across our campuses through research, learning, teaching, and community building, and is co-ordinated within the Office of Indigenous Relations.