Physical review. A/Physical review, A, Год журнала: 2025, Номер 111(1)
Опубликована: Янв. 8, 2025
Recently, distributed sensing has been extensively studied using squeezed states. While this is an excellent development, it desirable to investigate the use of other quantum probes, such as entangled states light. In paper, we focus on sensing, i.e., estimating multiple unknown phases at different spatial nodes multiphoton polarization-entangled Greenberger-Horne-Zeilinger across nodes. We utilize tools metrology and calculate Fisher information matrix (QFIM). However, QFIM turns out be singular, hindering determination Cramér-Rao bounds for parameters interest. Recent experiments have contended with a weaker form bound, which does not require inversion QFIM. It understand how relevant these are closely they approach exact bounds. thus analyze reason singularity and, by removing redundant phase, obtain nonsingular QFIM, allowing us derive Using show that arithmetic average Heisenberg limited. demonstrate metrological can saturated projective measurements, enabling determine matrix, also singular. then resolved. Published American Physical Society 2025
Язык: Английский
Процитировано
1Transverse orbital angular momentum and polarization entangled spatiotemporal structured light
Nanophotonics, Год журнала: 2025, Номер 14(6), С. 863 - 871
Опубликована: Фев. 12, 2025
Abstract Intra-system entanglement occurs between non-separable modes within the same system. For optical systems, various degrees of freedom light represent different modes, and potential use to create higher dimensional classical entangle states offers a promising drive new technological developments. In this work, we present experimental results demonstrating orthogonality transverse orbital angular momentum (t-OAM) spatiotemporal topological charges, previously unverified property t-OAM. Based on those results, developed methods characterize novel family t-OAM polarization entangled structured light. We further provide theoretical analysis support our study modes. By feasibility leveraging as for entanglement, work represents advancement towards strategies.
Язык: Английский
Процитировано
1Quantum interferometers: Principles and applications
Progress in Quantum Electronics, Год журнала: 2024, Номер 96, С. 100519 - 100519
Опубликована: Июнь 15, 2024
Язык: Английский
Процитировано
8Quantum correlations via vector soliton interactions
Physical review. A/Physical review, A, Год журнала: 2025, Номер 111(1)
Опубликована: Янв. 9, 2025
Язык: Английский
Процитировано
0Missed Detection of Entanglement in Two-Mode Squeezed States Based on the Inseparability Criterion
Applied Sciences, Год журнала: 2025, Номер 15(3), С. 1013 - 1013
Опубликована: Янв. 21, 2025
The inseparability criterion provides a straightforward and efficient method for identifying quantifying two-mode Gaussian quantum entanglement, making it crucial tool in optics experiments. However, is to recognize that the serves only as sufficient condition entanglement assessment, thereby posing risk of missed detection during evaluation. This paper investigates use assessing squeezed states, with particular focus on examining due asymmetry. results show when decoherence symmetrically affects both modes, effectively detects entanglement. In contrast, this symmetry broken, may fail identify likelihood increasing By comparing these positive partial transpose criterion, which necessary condition, occurrence detections by confirmed. Our research not valuable insights into application information tasks but also deepens understanding its operational principles limitations.
Язык: Английский
Процитировано
0Quantum illumination networks
Communications Physics, Год журнала: 2025, Номер 8(1)
Опубликована: Фев. 4, 2025
Язык: Английский
Процитировано
0Polarization entangled photon pairs from lithium niobate metasurfaces
Optics Letters, Год журнала: 2025, Номер 50(7), С. 2294 - 2294
Опубликована: Март 11, 2025
Flat optics has emerged as a promising platform for ultrathin polarization-entangled sources via spontaneous parametric downconversion in subwavelength-thick nonlinear films or metasurfaces. However, previous schemes typically required multiplexing two meta-structures with different orientations. Here, we propose metasurface composed of single silica grating atop lithium niobate film to generate photon pairs. By engineering the angular dispersion resonances, adjusting pump frequency, and leveraging polarization correlated transverse phase matching, |HH〉 |VV〉 states are simultaneously enhanced by over 2000 times, while |HV〉 |VH〉 remain similar when compared pure film. Therefore, degree entanglement is significantly improved. Furthermore, tuning orientation, applying spatial filtering, concurrence two-photon state optimized near one, meaning maximal entanglement. Such an spatial-separated-entangled photon-pair source will be useful realizing miniaturized quantum photonic systems various applications.
Язык: Английский
Процитировано
0Multiphoton quantum imaging using natural light
Applied Physics Reviews, Год журнала: 2025, Номер 12(1)
Опубликована: Март 1, 2025
It is thought that schemes for quantum imaging are fragile against realistic environments in which the background noise often stronger than nonclassical signal of photons. Unfortunately, it unfeasible to produce brighter light sources alleviate this problem. Here, we overcome paradigmatic limitation by developing a scheme relies on use natural light. This achieved performing conditional detection photon number thermal field scattered remote object. Specifically, measurements our enable us extract features detected photons images with improved signal-to-noise ratios. technique shows an exponential enhancement contrast images. measurement enables possibility producing from vacuum fluctuations field. experimentally demonstrated through implementation single-pixel camera photon-number-resolving capabilities. As such, believe opens new paradigm imaging. also unveils potential combining development robust technologies.
Язык: Английский
Процитировано
0Sample classification using machine learning-assisted entangled two-photon absorption
AVS Quantum Science, Год журнала: 2025, Номер 7(2)
Опубликована: Апрель 4, 2025
Entangled two-photon absorption (eTPA) has been recognized as a potentially powerful tool for the implementation of ultra-sensitive spectroscopy. Unfortunately, there exists general agreement in quantum optics community that experimental eTPA signals, particularly those obtained from molecular solutions, are extremely weak. Consequently, obtaining spectroscopic information about an arbitrary sample via conventional methods rapidly becomes unrealistic endeavor. To address this problem, authors introduce scheme reduces amount data needed to identify and classify unknown samples their electronic structure. Their proposed method makes use machine learning extract number intermediate levels participate excitation absorbing medium. This is achieved by training artificial neural networks (ANNs) with various signals where delay between absorbed photons externally controlled. Inspired multiple studies eTPA, consider model systems comprising one four levels, whose energies randomly chosen different intermediate-level bandgaps, namely, Δλ=10, 20, 30, 40 nm. Within these goal testing efficiency intelligence algorithms, make three wavelength spacing 1, 0.5, 0.1 The find proper entanglement time photons, classification average efficiencies exceed 99% all configurations. results demonstrate potential ANNs facilitating
Язык: Английский
Процитировано
0Spatial-light-mode analogs of generalized quantum coherent states
Physical review. A/Physical review, A, Год журнала: 2024, Номер 110(3)
Опубликована: Сен. 26, 2024
Язык: Английский
Процитировано
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