Gravitational redshift induces quantum interference
- URL: http://arxiv.org/abs/2109.00728v2
- Date: Fri, 16 Dec 2022 13:16:29 GMT
- Title: Gravitational redshift induces quantum interference
- Authors: David Edward Bruschi and Andreas W. Schell
- Abstract summary: We show that gravitational redshift induces a unitary transformation on the quantum state of propagating photons.
We devise a protocol that exploits gravity to induce a Hong-Ou-Mandel-like interference effect on the state of two photons.
- Score: 0.0
- License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
- Abstract: We use quantum field theory in curved spacetime to show that gravitational
redshift induces a unitary transformation on the quantum state of propagating
photons. This occurs for realistic photons characterized by a finite bandwidth,
while ideal photons with sharp frequencies do not transform unitarily. We find
that the transformation is a mode-mixing operation, and we devise a protocol
that exploits gravity to induce a Hong-Ou-Mandel-like interference effect on
the state of two photons. Testing the results of this work can provide a
demonstration of quantum field theory in curved spacetime.
Related papers
- Nonlinear dynamical Casimir effect and Unruh entanglement in waveguide QED with parametrically modulated coupling [83.88591755871734]
We study theoretically an array of two-level qubits moving relative to a one-dimensional waveguide.
When the frequency of this motion approaches twice the qubit resonance frequency, it induces parametric generation of photons and excitation of the qubits.
We develop a comprehensive general theoretical framework that incorporates both perturbative diagrammatic techniques and a rigorous master-equation approach.
arXiv Detail & Related papers (2024-08-30T15:54:33Z) - Imaging-based Quantum Optomechanics [0.6025438902954768]
In active imaging protocols, information about a landscape is encoded into the spatial mode of a scattered photon.
We show that backaction in this setting arises from spatial photon shot noise, an effect that cannot be observed in single-mode optomechanics.
In conjunction with high-$Q$ nanomechanics, our findings point to new opportunities at the interface of quantum imaging and optomechanics.
arXiv Detail & Related papers (2024-07-09T17:31:50Z) - Photon-Gravity Coupling in Schwarzschild Spacetime [0.0]
A canonical formalism for quantum electrodynamics in curved spacetime is developed.
The claim that "the gravitational redshift is a shift in the sharp frequencies of the photons for all of the spectrum" is proved.
It is shown the gravitational decoherence is due to photon-gravity coupling and observer-dependent quantum electrodynamics in curved spacetime phenomena.
arXiv Detail & Related papers (2024-02-12T17:48:14Z) - Introduction to gravitational redshift of quantum photons propagating in
curved spacetime [0.0]
The effect of gravity on the spectrum computed for photons largely confined along the direction of propagation is discussed.
A unitary transformation can be constructed for realistic photons with finite bandwidth.
arXiv Detail & Related papers (2023-03-30T14:28:11Z) - Quantum vortices of strongly interacting photons [52.131490211964014]
Vortices are hallmark of nontrivial dynamics in nonlinear physics.
We report on the realization of quantum vortices resulting from a strong photon-photon interaction in a quantum nonlinear optical medium.
For three photons, the formation of vortex lines and a central vortex ring attests to a genuine three-photon interaction.
arXiv Detail & Related papers (2023-02-12T18:11:04Z) - Ultra-long photonic quantum walks via spin-orbit metasurfaces [52.77024349608834]
We report ultra-long photonic quantum walks across several hundred optical modes, obtained by propagating a light beam through very few closely-stacked liquid-crystal metasurfaces.
With this setup we engineer quantum walks up to 320 discrete steps, far beyond state-of-the-art experiments.
arXiv Detail & Related papers (2022-03-28T19:37:08Z) - Spacetime effects on wavepackets of coherent light [24.587462517914865]
We introduce an operational way to distinguish between the overall shift in the pulse wavepacket and its genuine deformation after propagation.
We then apply our technique to quantum states of photons that are coherent in the frequency degree of freedom.
We find that the quantum coherence initially present can enhance the deformation induced by propagation in a curved background.
arXiv Detail & Related papers (2021-06-23T14:20:19Z) - Hyperentanglement in structured quantum light [50.591267188664666]
Entanglement in high-dimensional quantum systems, where one or more degrees of freedom of light are involved, offers increased information capacities and enables new quantum protocols.
Here, we demonstrate a functional source of high-dimensional, noise-resilient hyperentangled states encoded in time-frequency and vector-vortex structured modes.
We generate highly entangled photon pairs at telecom wavelength that we characterise via two-photon interference and quantum state tomography, achieving near-unity visibilities and fidelities.
arXiv Detail & Related papers (2020-06-02T18:00:04Z) - Theory of waveguide-QED with moving emitters [68.8204255655161]
We study a system composed by a waveguide and a moving quantum emitter in the single excitation subspace.
We first characterize single-photon scattering off a single moving quantum emitter, showing both nonreciprocal transmission and recoil-induced reduction of the quantum emitter motional energy.
arXiv Detail & Related papers (2020-03-20T12:14:10Z) - Quantum-Clustered Two-Photon Walks [68.8204255655161]
We demonstrate a previously unknown two-photon effect in a discrete-time quantum walk.
Two identical bosons with no mutual interactions can remain clustered together.
The two photons move in the same direction at each step due to a two-photon quantum interference phenomenon.
arXiv Detail & Related papers (2020-03-12T17:02:35Z) - The influence of spacetime curvature on quantum emission in optical
analogues to gravity [0.0]
Quantum fluctuations on curved spacetimes cause the emission of pairs of particles from the quantum vacuum.
We analytically calculate for all the particle flux, correlations and entanglement frequencies.
The quantum state is a diagnostic for the mode conversion in laboratory tests of quantum field theory on curved spacetimes.
arXiv Detail & Related papers (2020-01-16T14:09:37Z)
This list is automatically generated from the titles and abstracts of the papers in this site.
This site does not guarantee the quality of this site (including all information) and is not responsible for any consequences.