Making two particle detectors in flat spacetime communicate quantumly

Abstract

A communication protocol with non-zero quantum capacity is found when the two communicating parts are particle detector models in (3+1)-dimensional spacetime. In particular, as detectors, we consider two harmonic oscillators interacting with a scalar field, whose evolution is generalized for whatever background spacetime and whatever spacetime smearing of the detectors. We then specialize to Minkowski spacetime and an initial Minkowski vacuum, considering a rapid interaction between the field and the two detectors, studying the case where the receiver is static and the sender is moving. The possibility to have a quantum capacity greater than zero stems from a relative acceleration between the detectors. Indeed, no reliable quantum communication is possible when the two detectors are static or moving inertially with respect to each other, but a reliable quantum communication can be achieved between a uniformly accelerated sender and an inertial receiver.

29 pages, 4 figures

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Cited by in corpus (4)

• Preserving quantum information in $f(Q)$ cosmology
• Transmission of quantum information through quantum fields in curved spacetimes
• Gaussian states in quantum field theory: Exact representations of relative phase in superpositions of Gaussian states
• How cosmological expansion affects communication between distant quantum systems