Coherence and Dimensionality Witnesses for Fractional OAM Modes
- URL: http://arxiv.org/abs/2509.13275v1
- Date: Tue, 16 Sep 2025 17:29:57 GMT
- Title: Coherence and Dimensionality Witnesses for Fractional OAM Modes
- Authors: A. L. S. Santos Junior, I. Prego, M. Gil de Oliveira, A. C. Barbosa, B. P. da Silva, D. J. Brod, E. F. Galvão, A. Z. Khoury,
- Abstract summary: We characterize sets of fractional orbital angular momentum (OAM) modes of a light beam using unitary-invariant properties encoded by two-mode overlaps.<n>We experimentally certify, on a triple of fractional modes, both the presence of coherence and that the states necessarily span a space of dimension 3.
- Score: 0.0
- License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
- Abstract: We characterize sets of fractional orbital angular momentum (OAM) modes of a light beam using unitary-invariant properties encoded by two-mode overlaps. Using basis-independent coherence and dimension witnesses, we experimentally certify, on a triple of fractional modes, both the presence of coherence and that the states necessarily span a space of dimension 3. We propose and implement a practical, fast experimental method to extract two-mode overlaps requiring only a single intensity image per interference pair. These results lay the groundwork for using fractional OAM states in high-dimensional quantum information protocols.
Related papers
- Multiparameter estimation for the superresolution of two incoherent sources [36.94429692322632]
We experimentally demonstrate the simultaneous estimation of the three parameters characterizing a pair of incoherent optical sources in the sub-Rayleigh regime.<n>We benchmark our performance using Fisher-information-based Cramér-Rao bounds, and discuss the corresponding quantum limits.
arXiv Detail & Related papers (2026-01-21T11:05:44Z) - High-dimensional autocompensating discrete modulation CV-QKD protocol in optical fibers [41.94295877935867]
We use N-dimensional product states of weak coherent states that undergo perturbations along optical fibers.<n>We analyze the security of this high-dimensional protocol when an intercept and resend attack is implemented.
arXiv Detail & Related papers (2025-08-14T08:29:24Z) - Bipartite entanglement extracted from multimode squeezed light generated in lossy waveguides [0.0]
Entangled two-mode Gaussian states constitute an important building block for continuous variable quantum computing and communication protocols.<n>We demonstrate that the squeezing quantifies entanglement and we construct a measurement basis which results in the maximal bipartite entanglement.
arXiv Detail & Related papers (2025-06-11T10:36:00Z) - Estimation of multiple parameters encoded in the modal structure of light [39.58317527488534]
We investigate the problem of estimating simultaneously multiple parameters encoded in the shape of the modes on which the light is expanded.<n>We find that each parameter can be associated with a mode that is proportional to the derivative of either a single non-vacuum mode or the mean-field mode.
arXiv Detail & Related papers (2025-05-22T09:20:02Z) - Spectroscopy of collective modes in a Bose-Einstein condensate: From single to double excitation periods [0.0]
Collective modes are coherent excitations in Bose-Einstein condensates (BECs)<n>They can be used to probe the properties of BECs, such as the trap geometry, the interatomic interactions, and the presence of defects.<n>We propose a method to achieve a better resolution than the Rabi-like protocol, which consists of two oscillating fields separated in time.
arXiv Detail & Related papers (2024-11-06T14:17:21Z) - Asymptotically-deterministic robust preparation of maximally entangled
bosonic states [1.7188280334580195]
We introduce a theoretical scheme to prepare a pure Bell singlet state of two bosonic qubits, in a way that is robust under the action of arbitrary local noise.
We employ a polarization-insensitive, non-absorbing, parity check detector in an iterative process which achieves determinismally with the number of repetitions.
We conclude that the proposed protocol can be employed to prepare any pure state of two bosons which are maximally entangled in either the internal degree of freedom (Bell states) or the spatial mode (NOON states)
arXiv Detail & Related papers (2023-03-20T22:40:57Z) - Regression of high dimensional angular momentum states of light [47.187609203210705]
We present an approach to reconstruct input OAM states from measurements of the spatial intensity distributions they produce.
We showcase our approach in a real photonic setup, generating up-to-four-dimensional OAM states through a quantum walk dynamics.
arXiv Detail & Related papers (2022-06-20T16:16:48Z) - K-Space Transformer for Fast MRIReconstruction with Implicit
Representation [39.04792898427536]
We propose a Transformer-based framework for processing sparsely sampled MRI signals in k-space.
We adopt an implicit representation of spectrogram, treating spatial coordinates as inputs, and dynamically query the partially observed measurements.
To strive a balance between computational cost and reconstruction quality, we build a hierarchical structure with low-resolution and high-resolution decoders respectively.
arXiv Detail & Related papers (2022-06-14T16:06:15Z) - Superposition of two-mode squeezed states for quantum information
processing and quantum sensing [55.41644538483948]
We investigate superpositions of two-mode squeezed states (TMSSs)
TMSSs have potential applications to quantum information processing and quantum sensing.
arXiv Detail & Related papers (2021-02-01T18:09:01Z) - Entangling macroscopic light states by delocalized photon addition [41.94295877935867]
We show that one can preserve a high degree of entanglement even between macroscopically populated modes.<n>Discorrelation, a new joint statistical property of multimode quantum states, is also experimentally demonstrated here for the first time.
arXiv Detail & Related papers (2018-11-26T15:58:16Z)
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.