Gravitational Redshift Induces Quantum Interference

Bruschi, David Edward; Schell, Andreas W.

doi:10.1002/andp.202200468

Cited by 6 publications

(10 citation statements)

References 46 publications

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“…In this work we also use the nonnegative parameter 𝜒 for consistency with recent literature [58,59]. Gravitational redshift is a particular instance of change of frequency as measured by an emitter and an observer.…”

Section: Gravitational Redshiftmentioning

confidence: 99%

“…A physical (realistic) photon is characterized by a finite spatial extension and frequency bandwidth instead of an (infinitely) sharp momentum [58,59]. Photons with only one frequency do not exist, and what is usually meant by this characterization is that the frequency distribution of the photon is sharply peaked around the red or blue wavelengths.…”

Section: Modelling Realistic Photonsmentioning

confidence: 99%

“…A recent trend of work has initiated the study of the effects of gravity on the propagation of photons between different users located at different heights in the gravitational potential of the Earth [43,44,57,105,58,138,59]. The core idea is to model photons and excitations of a quantum field in (weakly) curved spacetime.…”

Section: Quantum Key Distributionmentioning

confidence: 99%

“…Therefore, probing the validity of the transformation (39) for a few modes of light and for different redshifts 𝜒 (i.e., different configurations of the Alice-Bob positioning) can be used to test the theory. Multimode mixing can induce quantum interference [60], and it has even been shown that it can induce Hong-Ou-Mandel-like quantum interference [59]. The conditions necessary for such phenomena to manifest can be obtained, for example, by engineering the input modes Â𝜔 𝑛 to have multiple peaks that alternate.…”

Section: Testing Fundamental Theories Of Naturementioning

confidence: 99%

“…In this work we review an approach recently developed to answer the question of gravitational redshift affecting the quantum state of light [43,44,57,58,59]. So far, the idea has been to model the photon as a wavepacket of a quantum field that propagates in curved spacetime and to obtain a relation between the wavepacket generated by the sender, usually called Alice, and the one detected by the receiver, usually called Bob.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Introduction to gravitational redshift of quantum photons propagating in curved spacetime

Rodríguez

Schell

Bruschi

2023

J. Phys.: Conf. Ser.

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Gravitational redshift is discussed in the context of quantum photons propagating in curved spacetime. A brief introduction to modelling realistic photons is first presented and the effect of gravity on the spectrum computed for photons largely confined along the direction of propagation. It is then shown that redshift-induced transformations on photon operators with sharp momenta are not unitary, while a unitary transformation can be constructed for realistic photons with finite bandwidth. The unitary transformation obtained is then characterized as a multimode mixing operation, which is a generalized rotation of the Hilbert-space basis. Finally, applications of these results are discussed with focus on performance of quantum communication protocols, exploitation of the effects for quantum metrology and sensing, as well as potential for tests of fundamental science.

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Section: Gravitational Redshiftmentioning

confidence: 99%

Section: Modelling Realistic Photonsmentioning

confidence: 99%

Section: Quantum Key Distributionmentioning

confidence: 99%

Section: Testing Fundamental Theories Of Naturementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Introduction to gravitational redshift of quantum photons propagating in curved spacetime

Rodríguez

Schell

Bruschi

2023

J. Phys.: Conf. Ser.

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Entanglement‐Enhanced Quantum Ranging in Near‐Earth Spacetime

Liu,

Wen,

Jing

et al. 2023

Adv Quantum Tech

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A quantum ranging protocol to determine the distance between an observer and a target in the near‐Earth curved spacetime is proposed. Unlike quantum illumination, the quantum ranging scheme utilizes multiple quantum hypothesis testing to simultaneously determine the presence and location of the target. The interest is in how the Earth's spacetime curvature influences photon propagation as well as the performance of the quantum ranging. It is found that the maximum potential advantage of the quantum ranging strategy in the curved spacetime outperforms its flat spacetime counterpart. It is shown that the number of transmitted modes can enhance the maximum potential advantage of the quantum ranging tasks. In contrast, the maximum potential advantage of quantum ranging cannot be significantly increased by dividing the range into multiple slices in the curved spacetime.

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