How cosmological expansion affects communication between distant quantum systems

Lapponi A. Luongo O. Mancini S.
15 February 2025 American Physical Society

Physical Review D
2025 #111 Issue 4

A quantum communication protocol between harmonic oscillator detectors, interacting with a quantum field, is developed in a cosmological expanding background. The aim is to see if the quantum effects arising in an expanding universe, such as the cosmological particle production, could facilitate the communication between two distant parts or if they provide an additive noisy effect. By considering a perfect cosmic fluid, the resulting expansion turns out to increase the classical capacity of the protocol. This increasing occurs for all the cosmological expansions unless the latter is sharpened just before the receivers detector interacts with the field. Moreover, the classical capacity turns out to be sensible to the barotropic parameter w of the perfect fluid and to the coupling between the field and the scalar curvature ζ. As a consequence, by performing this protocol, one can achieve information about the cosmological dynamics and its coupling with a background quantum field.

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Scuola Superiore Meridionale, Largo San Marcellino 10, Napoli, 80138, Italy
Istituto Nazionale di Fisica Nucleare, Sezione di Napoli, Complesso Universitario di Monte SantAngelo, Via Cintia Edificio 6, Napoli, 80126, Italy
Al-Farabi Kazakh National University, Al-Farabi Avenue 71, Almaty, 050040, Kazakhstan
School of Science and Technology, University of Camerino, Via Madonna delle Carceri 9, Camerino, 62032, Italy
SUNY Polytechnic Institute, Utica, 13502, NY, United States
Istituto Nazionale di Fisica Nucleare (INFN), Sezione di Perugia, Via Alessandro Pascoli, Perugia, 06123, Italy
INAF-Osservatorio Astronomico di Brera, Milano, Italy

Scuola Superiore Meridionale
Istituto Nazionale di Fisica Nucleare
Al-Farabi Kazakh National University
School of Science and Technology
SUNY Polytechnic Institute
Istituto Nazionale di Fisica Nucleare (INFN)
INAF-Osservatorio Astronomico di Brera

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