Verification of continuous variable entanglement with undetected photons
- URL: http://arxiv.org/abs/2601.08364v1
- Date: Tue, 13 Jan 2026 09:22:47 GMT
- Title: Verification of continuous variable entanglement with undetected photons
- Authors: Sanjukta Kundu, Balakrishnan Viswanathan, Pawel Szczypkowski, Gabriela Barreto Lemos, Mayukh Lahiri, Radek Lapkiewicz,
- Abstract summary: We verify transverse spatial entanglement of photon-pairs generated in spontaneous parametric down conversion.<n>We experimentally demonstrate the violation of the Einstein-Podolsky-Rosen criterion and of the Mancini-Giovannetti-Vitali-Tombesi criterion.
- Score: 0.0
- License: http://creativecommons.org/licenses/by/4.0/
- Abstract: We verify transverse spatial entanglement of photon-pairs generated in spontaneous parametric down conversion using a nonlinear interferometric technique without relying on any coincidence detection. We experimentally demonstrate the violation of the Einstein-Podolsky-Rosen criterion and of the Mancini-Giovannetti-Vitali-Tombesi criterion using single photon interference of one of the photons of the pairs. We also provide a comprehensive theoretical analysis. The experimental results that we have obtained show good agreement with the theoretical values. Our method performs well under experimental losses and can be applied to highly non-degenerate sources, where there are no suitable detectors for one of the photons in the quantum state and our method could also be extended to the discrete degrees of freedom to certify high-dimensional (OAM) entanglement.
Related papers
- Extracting the photon indistinguishability error from measurable quantum observables [0.0]
We present a method to extract the photon indistinguishability error from Hong-Ou-Mandel interference measurements.<n>The reported method applies to a wide range of single-photon sources, including quantum dots.
arXiv Detail & Related papers (2025-10-02T07:15:43Z) - Momentum-resolved Hong-Ou-Mandel interference of weak coherent states [0.0]
We demonstrate an experimental scheme for high-precision position measurements based on two-photon interferometry with independent photons and SPAD arrays.<n>Our scheme extends the operative range of Hong-Ou-Mandel interferometry beyond its intrinsic constraints due to photons indistinguishability.<n>We show that partial photon distinguishability and entanglement impurity are not necessarily a nuisance in a technique that relies on two-photon interference.
arXiv Detail & Related papers (2025-08-27T15:37:20Z) - 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) - Demonstration of Lossy Linear Transformations and Two-Photon Interference on a Photonic Chip [78.1768579844556]
We show that engineered loss, using an auxiliary waveguide, allows one to invert the spatial statistics from bunching to antibunching.
We study the photon statistics within the loss-emulating channel and observe photon coincidences, which may provide insights into the design of quantum photonic integrated chips.
arXiv Detail & Related papers (2024-04-09T06:45:46Z) - Entanglement of annihilation photons [141.5628276096321]
We present the results of a new experimental study of the quantum entanglement of photon pairs produced in positron-electron annihilation at rest.
Despite numerous measurements, there is still no experimental proof of the entanglement of photons.
arXiv Detail & Related papers (2022-10-14T08:21:55Z) - Probing the symmetry breaking of a light--matter system by an ancillary
qubit [50.591267188664666]
Hybrid quantum systems in the ultrastrong, and even more in the deep-strong, coupling regimes can exhibit exotic physical phenomena.
We experimentally observe the parity symmetry breaking of an ancillary Xmon artificial atom induced by the field of a lumped-element superconducting resonator.
This result opens a way to experimentally explore the novel quantum-vacuum effects emerging in the deep-strong coupling regime.
arXiv Detail & Related papers (2022-09-13T06:14:08Z) - Bell-inequality in path-entangled single photon and purity of single
photon state [1.5924410290166868]
We present a simple scheme to perform Bell's test and show the violation of CHSH inequality in a path-entangled single photon state.
We demonstrate this experimentally by generating and controlling path-entangled state using both, heralded and un-heralded single photons.
arXiv Detail & Related papers (2021-12-09T17:03:20Z) - Augmenting the Sensing Performance of Entangled Photon Pairs through
Asymmetry [0.0]
We analyze theoretically and experimentally cases of asymmetric detection, stimulation, and loss within a quantum nonlinear interferometer of entangled pairs.
Our findings can improve the performance of setups that rely on direct detection of entangled pairs.
arXiv Detail & Related papers (2021-06-16T17:23:27Z) - Symmetry allows for distinguishability in totally destructive
many-particle interference [52.77024349608834]
We investigate, in a four photon interference experiment in a laser-written waveguide structure, how symmetries control the suppression of many-body output events of a $J_x$ unitary.
We show that totally destructive interference does not require mutual indistinguishability between all, but only between symmetrically paired particles.
arXiv Detail & Related papers (2021-02-19T16:37:19Z) - Light-matter interactions near photonic Weyl points [68.8204255655161]
Weyl photons appear when two three-dimensional photonic bands with linear dispersion are degenerated at a single momentum point, labeled as Weyl point.
We analyze the dynamics of a single quantum emitter coupled to a Weyl photonic bath as a function of its detuning with respect to the Weyl point.
arXiv Detail & Related papers (2020-12-23T18:51:13Z)
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.