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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 qudits.Semiconductor 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

共振态Z_(cs)(3985)、Z_(cs)(4003):分属SU(3)_f破缺的2个新型四夸克九重态?

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Science Bulletin 2021年第16期66卷 1616-1619,M0003页

作者： Luciano Maiani Antonio D.Polosa Verónica Riquer dipartimento di Fisica and infn Sapienza Universitàdi RomaPiazzale Aldo Moro 2I-00185 RomaItaly

BESⅢ和LHCb实验上的新实验数据表明了2个显奇异夸克隐粲四夸克态Z_(cs)(3985)和Z_(cs)(4003)的存在.在奇异夸克部分,Z_(cs)(3985)和Z_(cs)(4003)的近简并重现了在X(3872)和Zc(3900)间看到的情形.本文指出,在四夸克态图像下,这些Z_(cs)... 详细信息

BESⅢ和LHCb实验上的新实验数据表明了2个显奇异夸克隐粲四夸克态Z_(cs)(3985)和Z_(cs)(4003)的存在.在奇异夸克部分,Z_(cs)(3985)和Z_(cs)(4003)的近简并重现了在X(3872)和Zc(3900)间看到的情形.本文指出,在四夸克态图像下,这些Z_(cs)共振态与X(3872)、X(4140)以及Zc(3900)等共振态可以被纳入J^(P)=1^(+)的C宇称相反的2个SU(3)_(f)九重态.作者预言了2个九重态中其他未被发现的共振态的质量.这一分类为四夸克态模型提供了关键证据.

关键词：奇异夸克共振态 SU(3) 四夸克态 BESⅢ 九重态宇称简并

Impact of laser chirp on the polarization of terahertz from two-color plasma

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Photonics Research 2023年第6期11卷 978-985页

作者： SEN MOU LUCA TOMARCHIO ANNALISA D’ARCO MARTA di FABRIZIO SALVATORE MACIS ALESSANDRO CURCIO LUIGI PALUMBO STEFANO LUPI MASSIMO PETRARCA infn-roma1 and Physics Department University of Rome“La Sapienza”00185 RomeItaly Physics Department University of Rome“La Sapienza”00185 RomeItaly SBAI Department of Basic and Applied Sciences for EngineeringUniversity of Rome“La Sapienza”00161 RomeItaly Centro de laseres Pulsados(CLPU) 37185 VillamayorSalamancaSpain infn-LNF 00044 FrascatiItaly

Two-color plasma,induced by two lasers of different colors,can radiate ultra-broadband and intense terahertz(THz)pulses,which is desirable in many technological and scientific applications.It was found that the polarization of the emitted THz depends on the phase difference between the fundamental laser wave and its second harmonic.Recent investigation suggests that chirp-induced change of pulse overlap plays an important role in the THz yield from two-color plasma.However,the effect of laser chirp on THz polarization remains unexplored.Hereby,we investigate the impact of laser chirp on THz polarization.It is unveiled that the chirp-induced phase difference affects THz polarization.Besides,positive and negative chirps have opposite effects on the variation of the THz polarization versus the phase difference.The polarization of THz generated by a positively chirped pump laser rotates clockwise with an increasing phase difference,while it rotates anticlockwise when generated by a negatively chirped pump laser.

关键词： polarization laser pump

A Comparison between Abraham and Minkowski Momenta

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Journal of Modern Physics 2016年第3期7卷 320-328页

作者： Massimo Testa dipartimento di Fisica Università degli Studi di Roma “La Sapienza” INFN—Sezione di Roma IPiazzale A. Moro 2 Roma Italy

In this paper I compare the Abraham and the Minkowski forms for the momentum pertaining to an electromagnetic wave inside a dielectric or a magnetic material. The discussion is based on a careful treatment of the surface charges and currents and of the forces acting on them. While in the dielectric case the Abraham momentum is certainly more appealing from the physical point of view, for a magnetic material it suggests an interpretation in terms of magnetic charges and related magnetic currents. The Minkowski momentum for magnetic non conducting materials, on the contrary, has a natural interpretation in terms of an amperian model, in which the dynamics is determined by the Lorentz force acting on bulk and surface electric currents.

关键词： Abraham-Minkowski Controversy Forces on dielectric and Magnetic Materials Snell’s law

Comment on ‘Note on X(3872) production at hadron colliders and its molecular structure’

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Chinese Physics C 2018年第11期42卷 105-106页

作者： A. Esposito B. Grinstein L. Maiani F. Piccinini A. Pilloni A.D. Polosa V. Riquer Center for Theoretical Physics and Dept. of Physics Columbia University New York NY 10027 USA Department of Physics University of California San Diego La Jolla California 92093-0315 USA CERN Theory Department Geneva 1211 Switzerland infn sezione di Pavia Via A. Bassi 6 27100 Pavia Italy Theory Center Thomas Jefferson National Accelerator Facility Newport News VA 23606 USA dipartimento di Fisica and infn Sapienza Universita di Roma P.le Aldo Moro 2 1-00185 Roma Italy

We briefly comment on the paper by Albaladejo et al., Chinese Phys. C 41 121001, rejecting its conclusions.

关键词： X（3872） hadronic molecules exotic hadrons

Impact of chronic exposure to bevacizumab on EpCAM-based detection of circulating tumor cells

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Chinese Journal of Cancer Research 2015年第5期27卷 491-496页

作者： Chiara Nicolazzo Isabella Massimi lavinia V.Lotti Simone Vespa Cristina Raimondi Fabio Maria Pulcinelli Angela Gradilone Paola Gazzaniga dipartimento di Medicina Molecolare Sapienza Università di Roma dipartimento di Medicina Sperimentale Sapienza Università di Roma

Background： Circulating tumor cells （CTCs） are often undetected through the immunomagnetic epithelial cell adhesion molecule （EpCAM）-based CellSearch~ System in breast and colorectal cancer （CRC） patients treated with bevacizumab （BEV）, where low CTC numbers have been reported even in patients with evidence of progression of disease. To date, the reasons for this discrepancy have not been clarified. This study was carried out to investigate the molecular and phenotypic changes in CRC cells after chronic exposure to BEV in vitro. Methods： The human CRC cell line WiDr was exposed to a clinically relevant dose of BEV for 3 months in vitro. The expression of epithelial and mesenchymal markers and EpCAM isoforms was determined by western blotting and immunofluorescence. To evaluate the impact of EpCAM variant isoforms expression on CTC enumeration by CellSearch, untreated and treated colon cancer cells were spiked into 7.5 mL of blood from a healthy donor and enumerated by CellSearch. Results： Chronic exposure of CRC cell line to BEV induced decreased expression of EpCAM 40 kDa isoform and increased expression EpCAM 42 kDa isoform, together with a decreased expression of cytokeratins （CK）, while no evidence of epithelial to mesenchymal transition （EMT） in treated cells was observed. The recovery rate of cells through CellSearch was gradually reduced in course of treatment with BEV, being 84% , 70% and 40% at l, 2 and 3 months, respectively. Conclusions： We hypothesize that BEV may prevent CellSearch from capturing CTCs through altering EpCAM isoforms.

关键词： Circulating tumor cells （CTCs） epithelial cell adhesion molecule （EpCAM） isoform bevacizumab（BEV） colorectal cancer （CRC）

On the Foundations of Statistical Mechanics: Ergodicity, Many Degrees of Freedom and Inference

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Communications in Theoretical Physics 2014年第10期61卷 469-475页

作者： Sergio Chibbaro lamberto Rondoni Angelo Vulpiani Sorbonne Universités UPMC Univ Paris 06CNRSUMR7190Institut Jean Le Rond d’AlembertF-75005 ParisFrance Kavli Institute for Theoretical Physics China CAS dip.Scienze Matematiche Politecnico di TorinoC.Duca degli Abruzzi 24TorinoItaly infn Sezione di TorinoVia P.Giuria 1TorinoItaly dipartimento di Fisica Università "La Sapienza" RomaItaly ISC-CNR Piazzale A.Moro 2 – 00185 RomaItaly

We review the main aspects of the foundations of statistical mechanics. In particular we explain why many degrees of freedom are necessary, while chaos(in the sense of positive Lyapunov exponents) is only marginally r... 详细信息

关键词： ergodic hypothesis chaos emergent properties statical inference

Morse Index of Multiple Blow-Up Solutions to the Two-dimensional Sinh-Poisson Equation

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Analysis in Theory and Applications 2022年第1期38卷 26-78页

作者： Ruggero Freddi Sbai Universita di Roma"La Sapienza"Via Antonio Scarpa14Palazzina E00161 RomaItaly

In this paper we consider the dirichlet problem■where p is a small parameter andΩis a C^(2)bounded domain in R^(2).In[1],the author proves the existence of a m-point blow-up solution u_(p)jointly with its asymptotic behaviour.We compute the Morse index of up in terms of the Morse index of the associated Hamilton function of this problem.In addition,we give an asymptotic estimate for the first 4m eigenvalues and eigenfunctions.

关键词： Morse index sinh-Poisson equation eigenvalues estimates

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量子计算里程碑式突破

Science Bulletin 2021年第7期66卷 637-639页

作者： Fabio Sciarrino NicolòSpagnolo Quantum Information laboratory Dipartimento di FisicaSapienza Universitàdi Roma

In recent years,much work has been directed to the development of technologies to enable the long-term goal of scalable,universal quantum computers.This effort is motivated by the promise of quantum computational speed-up in tasks such as integer factoring,quantum simulation,and solving systems of linear equations.Despite the tremendous advances in quantum technologies reported in the last few years,the implementation of a large-scale universal quantum computer is still far from our current capabilities.

关键词： equations. 量子计算 quantum