Entanglement Detection with Rotationally Covariant Measurements - From Compton Scattering to Lemonade

• URL: http://arxiv.org/abs/2512.03984v1
• Date: Wed, 03 Dec 2025 17:14:51 GMT
• Title: Entanglement Detection with Rotationally Covariant Measurements - From Compton Scattering to Lemonade
• Authors: Marlene Funck, Ilija Funk, Tizian Schmidt, René Schwonnek,
• Abstract summary: We study the detection of entanglement of polarized photons for measurement devices that are solely specified by rotational symmetry.<n>Our results suggest that lemonade-based detectors are suitable for entanglement detection.
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: The accurate and efficient detection of quantum entanglement remains a central challenge in quantum information science. In this work, we study the detection of entanglement of polarized photons for measurement devices that are solely specified by rotational symmetry. We derive explicit positive operator valued measures (POVMs) showing that from a quantum information perspective any such setting is classified by one real measurable parameter r. In Particular, we give a POVM formulation of the Klein--Nishina formula for Compton scattering of polarized photons. We provide an SDP-based entanglement certification method that operates on the full measured statistics and gives tight bounds, also considering semi-device independent scenarios. Furthermore, we show that, while Bell violations are impossible with rotationally covariant measurements, EPR steering can still be certified under one-sided symmetry constraints. Finally, we present a rotationally covariant showcase experiment, analyzing the scattering of polarized optical light in a selection of soft drinks. Our results suggest that lemonade-based detectors are suitable for entanglement detection.

Related papers

• Achieving quantum-limited sub-Rayleigh identification of incoherent sources with arbitrary intensities [0.0]
  We develop a model for incoherent light with arbitrary intensity collected by passive, linear optical systems.<n>We show that collective measurements may actually be needed to achieve the ultimate quantum Chernoff bound for the discrimination of specific incoherent sources.
  arXiv  Detail & Related papers  (2025-09-03T17:52:01Z)
• Quantum Interference of Distinguishable Photons Based on Spatially-Resolved Measurements [67.410870290301]
  We present experimental results demonstrating the quantum interference of two photons distinguishable in their transverse momenta.<n>We contrast our results with a non-spatially resolved measurement where averaging over the photons' positions washes out the quantum interference observed in spatially resolved measurements.
  arXiv  Detail & Related papers  (2025-08-20T16:56:59Z)
• Automated Polarization Basis Adjustment and Security Monitoring in Quantum Communication via Coincidence Entropies [0.0]
  Polarization-sensitive receivers for single photons are of crucial importance in various applications within the fields of quantum communication and quantum sensing.<n>We present a method for birefringence compensation in an all-fiber detection setup that relies solely on coincidence measurements of a polarization-entangled state.
  arXiv  Detail & Related papers  (2025-05-29T23:28:13Z)
• Avoided-crossings, degeneracies and Berry phases in the spectrum of quantum noise through analytic Bloch-Messiah decomposition [49.1574468325115]
  "analytic Bloch-Messiah decomposition" provides approach for characterizing dynamics of quantum optical systems.<n>We show that avoided crossings arise naturally when a single parameter is varied, leading to hypersensitivity of the singular vectors.<n>We highlight the possibility of programming the spectral response of photonic systems through the deliberate design of avoided crossings.
  arXiv  Detail & Related papers  (2025-04-29T13:14:15Z)
• Quantum-enabled Rydberg atomic polarimetry of radio-frequency fields [37.69303106863453]
  Rydberg atoms efficiently link photons between the radio-frequency (RF) and optical domains.<n>We investigate spectroscopic signatures owing to the angular momentum quantization of the atomic states.<n>Our study adds important insights into the prospects of Rydberg atomic gases for quantum metrological electric field characterization.
  arXiv  Detail & Related papers  (2025-03-23T09:13:36Z)
• A Hybrid Measurement Scheme for Generating nonGaussian Spin States [0.0]
  We present a protocol for generating nonclassical states of atomic spin ensembles.<n>We create a spin squeezed state by measuring the light's polarization rotation.<n>We detect single photons scattered into the signal mode.
  arXiv  Detail & Related papers  (2025-02-26T19:59:39Z)
• Impact of polarization mode dispersion on entangled photon distribution [34.82692226532414]
  Polarization mode dispersion (PMD) in optical fibers poses a major challenge for maintaining the fidelity of quantum states for quantum communications.<n>Our research proposes effective methods to mitigate PMD effects for broadband entangled photons and evaluates the impact of higher-order PMD effects.
  arXiv  Detail & Related papers  (2024-08-03T11:29:45Z)
• Universal quantum frequency comb measurements by spectral mode-matching [39.58317527488534]
  We present the first general approach to make arbitrary, one-shot measurements of a multimode quantum optical source. This approach uses spectral mode-matching, which can be understood as interferometry with a memory effect.
  arXiv  Detail & Related papers  (2024-05-28T15:17:21Z)
• Witnessing Quantum Entanglement Using Resonant Inelastic X-ray Scattering [3.2509613040125878]
  entanglement is a central ingredient in our understanding of quantum many-body systems and an essential resource for quantum technologies. We devise a method to extract the quantum Fisher information (QFI) from non-Hermitian operators and formulate an entanglement witness for resonant inelastic x-ray scattering (RIXS) We find that entanglement is challenging to detect under standard conditions, but that it could be achieved by analyzing the outgoing x-ray polarization or via specific choices of momentum and energy.
  arXiv  Detail & Related papers  (2024-04-08T20:31:41Z)
• Theory of free fermions dynamics under partial post-selected monitoring [49.1574468325115]
  We derive a partial post-selected Schrdinger"o equation based on a microscopic description of continuous weak measurement. We show that the passage to the monitored universality occurs abruptly at finite partial post-selection. Our approach establishes a way to study MiPTs for arbitrary subsets of quantum trajectories.
  arXiv  Detail & Related papers  (2023-12-21T16:53:42Z)
• Enhanced Entanglement in the Measurement-Altered Quantum Ising Chain [43.80709028066351]
  Local quantum measurements do not simply disentangle degrees of freedom, but may actually strengthen the entanglement in the system.<n>This paper explores how a finite density of local measurement modifies a given state's entanglement structure.
  arXiv  Detail & Related papers  (2023-10-04T09:51:00Z)
• Unbounded randomness from uncharacterized sources [0.0]
  In Device-Independent and Semi-Device-Independent scenarios, randomness is certified using projective measurements. We propose a new Source-Device-Independent protocol, based on Positive Operator Valued Measurement (POVM) We experimentally demonstrate our method with a compact and simple photonic setup that employs polarization-encoded qubits and POVM up to 6 outcomes.
  arXiv  Detail & Related papers  (2020-10-12T15:54:22Z)

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.