Quantum Information in Relativity: the Challenge of QFT Measurements

Abstract

Proposed quantum experiments in deep space will be able to explore quantum information issues in regimes where relativistic effects are important. In this essay, we argue that a proper extension of Quantum Information theory into the relativistic domain requires the expression of all informational notions in terms of quantum field theoretic (QFT) concepts. This task requires a working and practicable theory of QFT measurements. We present the foundational problems in constructing such a theory, especially in relation to longstanding causality and locality issues in the foundations of QFT. Finally, we present the ongoing Quantum Temporal Probabilities program for constructing a measurement theory that (i) works, in principle, for any QFT, (ii) allows for a first-principles investigation of all relevant issues of causality and locality, and (iii) it can be directly applied to experiments of current interest.

22 pages, prepared for Entropy special issue "Quantum Information in Quantum Gravity"

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Cited by in corpus (6)

• Quantum Field Theory based Quantum Information: Measurements and Correlations
• Gravitational Harmonium: Gravitationally Induced Entanglement in a Harmonic Trap
• Gravity, Quantum Fields and Quantum Information: Problems with classical channel and stochastic theories
• Signatures of Quantum Gravity in the Gravitational Self-Interaction of Photons
• Towards a Field-Theory based Relativistic Quantum Information
• Relativistic time-of-arrival measurements: predictions, post-selection and causality problem