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Probing gravity with two-photon interference of frequency-entangled pairs

Roura, Albert (2023) Probing gravity with two-photon interference of frequency-entangled pairs. 2023 NASA Fundamental Physics Workshop, 23.–25. Mai 2023, Santa Barbara, Kalifornien, USA.

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In recent years there has been a growing interest in probing the interplay between quantum mechanics and general relativity with delocalized quantum superpositions where the two components of the superposition experience different relativistic effects [1, 2]. Notably, atom interferometry experiments in Stanford's 10-m atomic fountain have measured the effect of a non-vanishing proper-time difference due to spacetime curvature on the interference signal [3, 4]. However, these experiments can be alternatively described in terms of non-relativistic quantum mechanics and Newtonian gravity. In contrast, quantum interference experiments with relativistic particles such as photons, which require a quantum field theory (QFT) treatment, offer the possibility of exploring a regime where both quantum mechanics and general relativity play an essential role. In this talk I will focus on gravitational-redshift measurements relying on two-photon interference of frequency-entangled pairs. Such interferometry experiments, which have no classical analog, can be realized with optical links to low-Earth-orbit spacecrafts employing quantum states of light, and will allow directly testing, for the first time, aspects of QFT in curved spacetime [5]. [1] M. Zych et al., Nat. Comm. 2, 505 (2011). [2] A. Roura, Phys. Rev. X 10, 021014 (2020). [3] C. Overstreet et al., Science 375, 226 (2022). [4] A. Roura, Science 375, 142 (2022). [5] M. Mohageg et al., EPJ Quant. Tech. 9, 25 (2022).

Item URL in elib:https://elib.dlr.de/195284/
Document Type:Conference or Workshop Item (Speech)
Title:Probing gravity with two-photon interference of frequency-entangled pairs
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Roura, AlbertUNSPECIFIEDhttps://orcid.org/0000-0002-8049-8982UNSPECIFIED
Date:24 May 2023
Refereed publication:No
Open Access:Yes
Gold Open Access:No
In ISI Web of Science:No
Keywords:Gravitation, general relativistic effects, gravitational redshift measurements, two-photon interference, quantum entanglement, space quantum links, quantum field theory in curved spacetime
Event Title:2023 NASA Fundamental Physics Workshop
Event Location:Santa Barbara, Kalifornien, USA
Event Type:international Conference
Event Dates:23.–25. Mai 2023
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Communication, Navigation, Quantum Technology
DLR - Research area:Raumfahrt
DLR - Program:R KNQ - Communication, Navigation, Quantum Technology
DLR - Research theme (Project):R - Project Q-GRAV – Interface quantum and gravitation
Location: Ulm
Institutes and Institutions:Institute of Quantum Technologies > Theoretical Quantum Physics
Deposited By: Roura, Dr. Albert
Deposited On:06 Jun 2023 18:03
Last Modified:06 Jun 2023 18:03

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