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Deep reinforcement learning for quantum multiparameter estimation

Advanced Photonics 2023年第1期5卷 58-70页

作者： valeria Cimini mauro valeri Emanuele Polino Simone Piacentini Francesco Ceccarelli Giacomo Corrielli NicolòSpagnolo Roberto Osellame Fabio Sciarrino Sapienza Universitàdi Roma Dipartimento di FisicaRomaItaly Istituto di Fotonica e Nanotecnologie Consiglio Nazionale delle RicercheMilanoItaly

Estimation of physical quantities is at the core of most scientific research,and the use of quantum devices promises to enhance its *** real scenarios,it is fundamental to consider that resources are limited,and Bayesian adaptive estimation represents a powerful approach to efficiently allocate,during the estimation process,all the available ***,this framework relies on the precise knowledge of the system model,retrieved with a fine calibration,with results that are often computationally and experimentally *** introduce a model-free and deep-learning-based approach to efficiently implement realistic Bayesian quantum metrology tasks accomplishing all the relevant challenges,without relying on any a priori knowledge of the *** overcome this need,a neural network is trained directly on experimental data to learn the multiparameter Bayesian *** the system is set at its optimal working point through feedback provided by a reinforcement learning algorithm trained to reconstruct and enhance experiment heuristics of the investigated quantum ***,we prove experimentally the achievement of higher estimation performances than standard methods,demonstrating the strength of the combination of these two black-box algorithms on an integrated photonic *** work represents an important step toward fully artificial intelligence-based quantum metrology.

关键词： quantum sensing integrated photonics machine learning for metrology

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Orbital angular momentum based intra- and interparticle entangled states generated via a quantum dot source

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先进光子学(英文) 2023年第4期5卷 74-84页

作者： Alessia Suprano Danilo Zia Mathias Pont Taira Giordani Giovanni Rodari mauro valeri Bruno Piccirillo Gonzalo Carvacho Nicolo Spagnolo Pascale Senellart Lorenzo Marrucci Fabio Sciarrino Sapienza Universitàdi Roma Dipartimento di FisicaRomaItaly Universite Paris-Saclay UMR 9001Centre for Nanosciences and NanotechnologyCNRSPalaiseauFrance Universitàdi Napoli Federico II Complesso Universitario di Monte Sant’AngeloDipartimento di Fisica“Ettore Pancini”NapoliItaly INFN-Sezione di Napoli NapoliItaly

Engineering single-photon states endowed with orbital angular momentum (OAM) is a powerful toolfor quantum information photonic implementations. Indeed, due to its unbounded nature, OAM is suitable forencoding qudits, allowing a single carrier to transport a large amount of information. Most of the experimentalplatforms employ spontaneous parametric down-conversion processes to generate single photons, evenif this approach is intrinsically probabilistic, leading to scalability issues for an increasing number of *** quantum dots (QDs) have been used to get over these limitations by producing on-demand pure and indistinguishable single-photon states, although only recently they have been exploitedto create OAM modes. Our work employs a bright QD single-photon source to generate a complete set ofquantum states for information processing with OAM-endowed photons. We first study hybrid intraparticleentanglement between OAM and polarization degrees of freedom of a single photon whose preparationwas certified by means of Hong–Ou–Mandel visibility. Then, we investigate hybrid interparticle OAM-based entanglement by exploiting a probabilistic entangling gate. The performance of our approach isassessed by performing quantum state tomography and violating Bell inequalities. Our results pave theway for the use of deterministic sources for the on-demand generation of photonic high-dimensionalquantum states.

关键词： orbital angular momentum quantum dot intraparticle entanglement interparticle entanglement Bell violation

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Air-core fiber distribution of hybrid vector vortex-polarization entangled states

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Advanced Photonics 2019年第4期1卷 42-50页

作者： Daniele Cozzolino Emanuele Polino mauro valeri Gonzalo Carvacho Davide Bacco NicoloSpagnolo Leif K.Oxenløwe Fabio Sciarrino Technical University of Denmark CoE SPOCDepartment of Photonics EngineeringLyngbyDenmark Sapienza Universitàdi Roma Dipartimento di FisicaRomaItaly Consiglio Nazionale delle Ricerche Istituto dei Sistemi ComplessiRomaItaly

Entanglement distribution between distant parties is one of the most important and challenging tasks in quantum *** of photonic entangled states using optical fiber links is a fundamental building block toward quantum *** the different degrees of freedom,orbital angular momentum(OAM)is one of the most promising due to its natural capability to encode high dimensional quantum *** experimentally demonstrate fiber distribution of hybrid polarization-vector vortex entangled photon *** this end,we exploit a recently developed air-core fiber that supports OAM *** fidelity distribution of the entangled states is demonstrated by performing quantum state tomography in the polarization-OAM Hilbert space after fiber propagation and by violations of Bell inequalities and multipartite entanglement *** results open new scenarios for quantum applications where correlated complex states can be transmitted by exploiting the vectorial nature of light.

关键词： orbital angular momentum quantum communication structured light multimode fiber multipartite entanglement

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