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Path-polarization hyperentangled and cluster states of photons on a chip

Light(Science & Applications) 2016年第1期5卷 836-841页

作者： Mario Arnolfo Ciampini Adeline Orieux Stefano Paesani Fabio Sciarrino Giacomo Corrielli andrea crespi Roberta Ramponi Roberto Osellame Paolo Mataloni Dipartimento di Fisica-Sapienza Universitàdi Roma I-00185 RomaItaly Istituto di Fotonica e Nanotecnologie-Consiglio Nazionale delle Ricerche(IFN-CNR) I-20133 MilanoItaly Dipartimento di Fisica-Politecnico di Milano I-20133 MilanoItaly Télécom ParisTech CNRS-LTCI46 rue BarraultF-75634 Paris CEDEX 13France Centre for Quantum Photonics H H Wills Physics Laboratory and Department of Electrical and Electronic Engineering University of BristolMerchant Ventures BuildingWoodland RoadBristol BS81UBUK.

Encoding many qubits in different degrees of freedom(DOFs)of single photons is one of the routes toward enlarging the Hilbert space spanned by a photonic quantum *** photon states(that is,states showing entanglement in multiple DOFs)have demonstrated significant implications for both fundamental physics tests and quantum communication and *** the number of qubits of photonic experiments requires miniaturization and integration of the basic elements,and functions to guarantee the setup stability,which motivates the development of technologies allowing the precise control of different photonic DOFs on a *** demonstrate the contextual use of path and polarization qubits propagating within an integrated quantum *** tested the properties of four-qubit linear cluster states built on both DOFs,and we exploited them to perform the Grover's search algorithm according to the one-way quantum computation *** results pave the way toward the full integration on a chip of hybrid multi-qubit multiphoton states.

关键词： hyperentanglement integrated photonics quantum information quantum optics

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Optimal photonic indistinguishability tests in multimode networks

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Science Bulletin 2018年第22期63卷 1470-1478页

作者： Niko Viggianiello Fulvio Flamini Marco Bentivegna Nicolò Spagnolo andrea crespi Daniel J.Brod Ernesto F.Galvao Roberto Osellame Fabio Sciarrino Dipartimento di Fisica Sapienza Universitadi RomoPiazzale Aldo Moro 51-00185RomaItaly Istituto di Fotonica e Nanotecnologie Consiglio Nazionale delle Ricerche (IFN-CNR)Piazza Leonardo da Vinci321-20133 MilanoItaly Diportimento di Fisica Politecnico di MilanoPiazza Leonardo da Vinci321-20133 MilanoItaly Perimeter Institute for Theoretical Physics 31 Caroline Street NorthWaterlooON N2L 2Y5Canada Instituto de Pisica Universidade Federal FluminenseAv.Gal.Milton Tavares de Souza s/nNiteroiRJ 24210-340Brazil

Particle indistinguishability is at the heart of quantum statistics that regulates fundamental phenomena such as the electronic band structure of solids, Bose-Einstein condensation and ***, it is necessary in practical applications such as linear optical quantum computation and simulation, in particular for Boson Sampling *** is thus crucial to develop tools to certify genuine multiphoton interference between multiple *** approach employs the total variation distance to find those transformations that minimize the error probability in discriminating the behaviors of distinguishable and indistinguishable *** particular, we show that so-called Sylvester interferometers are near-optimal for this *** using Bayesian tests and inference, we numerically show that Sylvester transformations largely outperform most Haar-random unitaries in terms of sample size ***, we experimentally demonstrate the efficacy of the transformation using an efficient 3 D integrated circuits in the single-and multiple-source *** then discuss the extension of this approach to a larger number of photons and *** results open the way to the application of Sylvester interferometers for optimal assessment of multiphoton interference experiments.

关键词： Particle indistinguishability Quantum statistics Optical quantum computation Quantum simulation Sylvester interferometers Bayesian tests Multiphoton interference experiments

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Thermally reconfigurable quantum photonic circuits at telecom wavelength by femtosecond laser micromachining

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Light(Science & Applications) 2015年第1期4卷 72-78页

作者： Fulvio Flamini Lorenzo Magrini Adil S Rab Nicolo Spagnolo Vincenzo D’Ambrosio Paolo Mataloni Fabio Sciarrino Tommaso Zandrini andrea crespi Roberta Ramponi Roberto Osellame Dipartimento di Fisica-Sapienza Universita di Roma P.le Aldo Moro 5I-00185 RomaItaly Istituto di Fotonica e Nanotecnologie-Consiglio Nazionale delle Ricerche(IFNCNR) P.za Leonardo da Vinci32I-20133 MilanoItaly Dipartimento di Fisica-Politecnico di Milano P.za Leonardo da Vinci32I-20133 MilanoItaly

The importance of integrated quantum photonics in the telecom band is based on the possibility of interfacing with the optical network infrastructure that was developed for classical *** this framework,femtosecond laser-written integrated photonic circuits,which have already been assessed for use in quantum information experiments in the 800-nm wavelength range,have great *** fact,these circuits,being written in glass,can be perfectly mode-matched at telecom wavelength to the in/out coupling fibers,which is a key requirement for a low-loss processing node in future quantum optical *** addition,for several applications,quantum photonic devices must be dynamically ***,we experimentally demonstrate the high performance of femtosecond laser-written photonic circuits for use in quantum experiments in the telecom band,and we demonstrate the use of thermal shifters,which were also fabricated using the same femtosecond laser,to accurately tune such ***-of-the-art manipulation of single-and two-photon states is demonstrated,with fringe visibilities greater than 95%.The results of this work open the way to the realization of reconfigurable quantum photonic circuits based on this technological platform.

关键词： femtosecond laser micromachining integrated quantum photonics thermal shifters tunable optical circuits

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Photonic implementation of boson sampling:a review

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Advanced Photonics 2019年第3期1卷 6-19页

作者： Daniel J.Brod Ernesto F.Galvão andrea crespi Roberto Osellame NicolòSpagnolo Fabio Sciarrino Universidade Federal Fluminense Instituto de FísicaNiteróiBrazil Consiglio Nazionale delle Ricerche Istituto di Fotonica e NanotecnologieMilanoItaly Politecnico di Milano Dipartimento di FisicaMilanoItaly Sapienza Universitàdi Roma Dipartimento di FisicaRomaItaly

Boson sampling is a computational problem that has recently been proposed as a candidate to obtain an unequivocal quantum computational *** problem consists in sampling from the output distribution of indistinguishable bosons in a linear *** is strong evidence that such an experiment is hard to classically simulate,but it is naturally solved by dedicated photonic quantum hardware,comprising single photons,linear evolution,and *** prospect has stimulated much effort resulting in the experimental implementation of progressively larger *** review recent advances in photonic boson sampling,describing both the technological improvements achieved and the future *** also discuss recent proposals and implementations of variants of the original problem,theoretical issues occurring when imperfections are considered,and advances in the development of suitable techniques for validation of boson sampling *** conclude by discussing the future application of photonic boson sampling devices beyond the original theoretical scope.

关键词： boson sampling multiphoton interference quantum supremacy quantum simulation integrated photonics

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High-speed integrated QKD system

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Photonics Research 2023年第6期11卷 1007-1014页

作者： REBECKA SAX ALBERTO BOARON GIANLUCA BOSO SIMONE ATZENI andrea crespi FADRI GRÜNENFELDER DAVIDE RUSCA AWS AL-SAADI DANILO BRONZI SEBASTIAN KUPIJAI HANJO RHEE ROBERTO OSELLAME HUGO ZBINDEN Group of Applied Physics University of Geneva1205 GenèveSwitzerland ID Quantique SA 1227 GenèveSwitzerland Institute for Photonics and Nanotechnologies and NO-IFN CNR-IFN20133 MilanoItaly Dipartimento di Fisica Politecnico di Milano20133 MilanoItaly Sicoya GmbH 12489 BerlinGermany

Quantum key distribution(QKD)is nowadays a well-established method for generating secret keys at a distance in an information-theoretically secure way,as the secrecy of QKD relies on the laws of quantum physics and not on computational *** order to industrialize QKD,low-cost,mass-manufactured,and practical QKD setups are ***,photonic and electronic integration of the sender's and receiver's respective components is currently in the *** we present a high-speed(2.5 GHz)integrated QKD setup featuring a transmitter chip in silicon photonics allowing for high-speed modulation and accurate state preparation,as well as a polarization-independent low-loss receiver chip in aluminum borosilicate glass fabricated by the femtosecond laser micromachining *** system achieves raw bit error rates,quantum bit error rates,and secret key rates equivalent to a much more complex state-of-the-art setup based on discrete components[*** et al.,***.121,190502(2018)].

关键词： technique QKD polarization

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Characterization of multimode linear optical networks

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Advanced Photonics Nexus 2023年第1期2卷 61-69页

作者： Francesco Hoch Taira Giordani Nicolò Spagnolo andrea crespi Roberto Osellame Fabio Sciarrino Sapienza Universitàdi Roma Dipartimento di FisicaRomaItaly Politecnico di Milano Dipartimento di FisicaMilanoItaly Istituto di Fotonica e Nanotecnologie Consiglio Nazionale delle RicercheMilanoItaly

Multimode optical interferometers represent the most viable platforms for the successful implementation of several quantum information schemes that take advantage of optical *** range from quantum communication and sensing,to computation,including optical neural networks,optical reservoir computing,or simulation of complex physical *** realization of such routines requires high levels of control and tunability of the parameters that define the operations carried out by the *** requirement becomes particularly crucial in light of recent technological improvements in integrated photonic technologies,which enable the implementation of progressively larger circuits embedding a considerable amount of tunable *** formulate efficient procedures for the characterization of optical circuits in the presence of imperfections that typically occur in physical experiments,such as unbalanced losses and phase instabilities in the input and output collection *** algorithm aims at reconstructing the transfer matrix that represents the optical interferometer without making any strong assumptions about its internal structure and *** show the viability of this approach in an experimentally relevant scenario,defined by a tunable integrated photonic circuit,and we demonstrate the effectiveness and robustness of our *** findings can find application in a wide range of optical setups,based on both bulk and integrated configurations.

关键词： integrated photonics device characterization quantum networks

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