Article
Optics
Nikolai Bolik, Caspar Groiseau, Jerry H. Clark, Alexander Gresch, Siamak Dadras, Gil S. Summy, Yingmei Liu, Sandro Wimberger
Summary: In this study, a theoretical model is proposed to explain the experimental data of a momentum-space quantum walk without invoking the presence of a thermal cloud. The model provides more complete explanations for quantum walks and topological phases in Floquet-driven systems.
Article
Optics
S. Panahiyan, S. Fritzsche
Summary: The study focuses on simulating topological phases in three dimensions using quantum walks, with an emphasis on protocols that can simulate different families of topological phases in various dimensions. The introduction of step-dependent coins in the evolution operators of quantum walks adds dynamism to the simulated topological phenomena, allowing for control over the numbers, types, and occurrences of topological phases and boundary states based on the step number of the quantum walk.
Article
Optics
P. A. Ameen Yasir, C. M. Chandrashekar
Summary: The researchers propose a method to achieve hyperentanglement in the different degrees of freedom of a photon (polarization, OAM, path) using an optical setup. By mapping the photon's degrees of freedom to two dimensions, they generate hyperentangled states. The amount of hyperentanglement is quantified by measuring the entanglement negativity.
Review
Optics
Andrew Forbes, Michael de Oliveira, Mark R. Dennis
Summary: Recent efforts have focused on controlling the structure of light in all its degrees of freedom and dimensions, pushing the limits of structured light and expanding its potential. Beyond traditional orbital angular momentum, two-dimensional fields, qubits and biphotons, and linear optical manipulation.
Article
Optics
Chao He, Yijie Shen, Andrew Forbes
Summary: This article discusses methods, challenges, and opportunities for the creation, detection, and control of multiple degrees of freedom for higher-dimensional structured light, and presents a roadmap for future development.
LIGHT-SCIENCE & APPLICATIONS
(2022)
Article
Multidisciplinary Sciences
Ming Gong, Shiyu Wang, Chen Zha, Ming-Cheng Chen, He-Liang Huang, Yulin Wu, Qingling Zhu, Youwei Zhao, Shaowei Li, Shaojun Guo, Haoran Qian, Yangsen Ye, Fusheng Chen, Chong Ying, Jiale Yu, Daojin Fan, Dachao Wu, Hong Su, Hui Deng, Hao Rong, Kaili Zhang, Sirui Cao, Jin Lin, Yu Xu, Lihua Sun, Cheng Guo, Na Li, Futian Liang, V. M. Bastidas, Kae Nemoto, W. J. Munro, Yong-Heng Huo, Chao-Yang Lu, Cheng-Zhi Peng, Xiaobo Zhu, Jian-Wei Pan
Summary: The study designed and fabricated a high-fidelity two-dimensional superconducting qubit array, demonstrating single- and double-particle quantum walks, realizing a Mach-Zehnder interferometer, and observing interference fringes. This work represents a milestone in bringing larger-scale quantum applications closer to realization on noisy intermediate-scale quantum processors.
Article
Optics
Hai-Jun Wu, Bing-Shi Yu, Zhi-Han Zhu, Wei Gao, Dong-Sheng Ding, Zhi-Yuan Zhou, Xiao-Peng Hu, Carmelo Rosales-Guzman, Yijie Shen, Bao-Sen Shi
Summary: In this work, a conformal frequency conversion scheme is proposed to maintain the full spatial structure of vectorial structured light. The spatial polarization independence of this scheme is systematically examined based on nondegenerate sum-frequency generation with type-0 phase matching. This proof-of-principle demonstration opens up possibilities for various applications.
Article
Materials Science, Multidisciplinary
Paul Wenk, Milena Grifoni, John Schliemann
Summary: The occurrence of a topological phase transition induced by an effective magnetic field in a two-dimensional electron gas with spin-orbit coupling and in proximity to an s-wave superconductor is demonstrated. The effective field, perpendicular to the plane, is generated by an in-plane, off-resonant ac-magnetic field or circularly polarized light. The conditions for entering the topological phase do not rely on fine parameter tuning and can be analytically evaluated. In this phase, chiral edge states generally emerge for a system in stripe geometry unless the Rashba and Dresselhaus couplings have the same magnitude. In the special case, the edge states become Majorana flat bands when driven by a magnetic field, due to the presence of chiral symmetry; the light-irradiated system is a trivial superconductor.
Article
Physics, Multidisciplinary
Tianqi Luo, Xin Guan, Jingtao Fan, Gang Chen, Suo-Tang Jia
Summary: In this study, we demonstrate the coupling of two Su-Schreiffer-Heeger (SSH) chains with opposite dimerizations and staggered interleg hoppings in the momentum-space lattice. The coupled SSH chain is a four-band model with sublattice symmetry similar to SSH4. Interestingly, the topological edge states occupy two sublattices simultaneously, analogous to a one-dimensional version of the type-II corner state. Analytical expressions for the edge states are obtained by solving the eigenequations. Finally, a possible experimental scheme is proposed to detect the topological winding number and corresponding edge states.
Editorial Material
Optics
Fu Feng, Xiaocong Yuan
Summary: The study of optical spatiotemporal vortices is crucial for advancing innovative physical mechanisms and applications in photonics, as this subset of structured light offers unique characteristics and a wide range of applications.
LIGHT-SCIENCE & APPLICATIONS
(2023)
Article
Physics, Multidisciplinary
Daniel Malz, Adam Smith
Summary: The study demonstrates the implementation of time-dependent experiments on a single qubit using IBM Quantum Experience, achieving high fidelities of around 97%. The results suggest the possibility of realizing a wide class of Floquet Hamiltonians, providing new directions for theoretical and experimental research on many-body systems.
PHYSICAL REVIEW LETTERS
(2021)
Article
Quantum Science & Technology
Tomoki Yamagami, Etsuo Segawa, Norio Konno
Summary: The study extends the scheme of quantum teleportation by quantum walks and introduces the mathematical definition and necessary conditions for achieving quantum teleportation rigorously. The results classify the parameters necessary for the successful accomplishment of quantum teleportation.
QUANTUM INFORMATION PROCESSING
(2021)
Article
Physics, Multidisciplinary
Jacob W. Turner, Jacob Biamonte
Summary: This article investigates the symmetry of physical processes under time inversion and explores a range of models and experimental implementations related to time symmetry breaking in quantum physics, providing a topological classification of Hamiltonian operators and characterizing gauge potentials on combinatorial graphs. These studies fill an important gap in our understanding of the role this effect plays in quantum information and computation.
JOURNAL OF PHYSICS A-MATHEMATICAL AND THEORETICAL
(2021)
Article
Optics
Isaac Nape, Bereneice Sephton, Pedro Ornelas, Chane Moodley, Andrew Forbes
Summary: Structured light has emerged as a hot topic, offering new states of light, enhanced functionality, and a modern toolbox for fundamental science. By structuring light as single photons and entangled states, high dimensional quantum states can be encoded using spatial modes, enabling tests of quantum mechanics and improved information processing. This tutorial outlines the basics of high dimensional quantum states expressed in spatial modes and explains how to create, control, and detect such states, focusing on transverse spatial modes like orbital angular momentum and pixel modes. Examples of applications, from communications to imaging, are also highlighted.
Article
Chemistry, Multidisciplinary
Simon Munyan, Arman Rashidi, Alexander C. Lygo, Robert Kealhofer, Susanne Stemmer
Summary: In this study, edge modes in the 2D TI phase of Cd3As2 are characterized using a quantum point contact device, and their controllable transmission is investigated, which is crucial for future applications in quantum interference devices.
Editorial Material
Physics, Multidisciplinary
Carlo Manzo, Gorka Munoz-Gil, Giovanni Volpe, Miguel Angel Garcia-March, Maciej Lewenstein, Ralf Metzler
JOURNAL OF PHYSICS A-MATHEMATICAL AND THEORETICAL
(2023)
News Item
Optics
Bruno Piccirillo, Veronica Vicuna-Hernandez
Summary: The resonance wavelengths of optical Mobius strip microcavities can be continuously tuned by changing the thickness-to-width ratio of the strip through geometric phase manipulation.
Article
Multidisciplinary Sciences
Bruno Piccirillo, Domenico Paparo, Andrea Rubano, Antonello Andreone, Marcello Rossetti Conti, Dario Giove, Veronica Vicuna-Hernandez, Can Koral, Maria Rosaria Masullo, Giovanni Mettivier, Michele Opromolla, Gianpaolo Papari, Andrea Passarelli, Giuseppe Pesce, Vittoria Petrillo, Ester Piedipalumbo, Marcel Ruijter, Paolo Russo, Luca Serafini
Summary: In this work, a liquid crystal-based modular and extendable platform is proposed for studying materials by analyzing polarization and wavefront of light. This platform will be driven by the future THz-FEL source TerRa@BriXSinO, which produces high power radiation in the THz-range. Liquid crystal-based geometric phase components have been fabricated to optimize the source's potential for accurately determining polarization- and wavefront-sensitive properties of materials. This platform allows characterizing various properties of materials and can add orbital angular momentum for investigating chiral agents' properties using nonlinear optics techniques.
Article
Optics
Francesco Di Colandrea, Amin Babazadeh, Alexandre Dauphin, Pietro Massignan, Lorenzo Marrucci, Filippo Cardano
Summary: In this work, a method of photonic quantum walks using liquid-crystal meta-surfaces is reported, enabling ultra-long distance walks between hundreds of optical modes. By exploiting spin-orbit effects, this method allows for space-dependent polarization transformations and mixing of circularly polarized optical modes with quantized transverse momentum. By using only a few meta-surfaces, quantum walks up to 320 discrete steps are simulated without optical amplification, surpassing current state-of-the-art experiments. Rating: 9 points.
Article
Quantum Science & Technology
Lin Zhang, Utso Bhattacharya, Adrian Bachtold, Stefan Forstner, Maciej Lewenstein, Fabio Pistolesi, Tobias Grass
Summary: Quantum dots placed on a vibrating nanotube provide a platform for studying electron-phonon interactions, which has promising prospects for discovering new quantum materials and understanding strong correlation effects. By coupling the dots to an electronic reservoir, the state of the system can be easily prepared. Our study shows that for certain coupling strengths, the system undergoes a Peierls transition into an insulating regime with charge-density wave order in the steady state, resulting from the competition between electronic Coulomb repulsive interactions and phonon-induced attractive interactions. The transport phenomena observed can serve as fingerprints of electronic correlations. We also present powerful numerical methods to capture the physics of this open electron-phonon system with a large number of phonons. Our work paves the way for studying and detecting correlated electron-phonon physics with current experimental techniques in nanotube quantum simulators.
NPJ QUANTUM INFORMATION
(2023)
Article
Chemistry, Multidisciplinary
Stefano Marni, Giovanni Nava, Raouf Barboza, Tommaso Giovanni Bellini, Liana Lucchetti
Summary: The motion of ferroelectric liquid sessile droplets deposited on a ferroelectric lithium niobate substrate can be controlled by a light beam of moderate intensity. The droplets are attracted or repelled depending on the side of the substrate exposed to light irradiation. Furthermore, moving the beam allows for long-distance movement of the droplets on the substrate, indicating the coupling between the droplet polarization and the polarization induced in the substrate.
ADVANCED MATERIALS
(2023)
Article
Physics, Multidisciplinary
Hugo Cayla, Pietro Massignan, Thierry Giamarchi, Alain Aspect, Christoph I. Westbrook, David Clement
Summary: We measured the momentum density in a Bose-Einstein condensate (BEC) with dilute spin impurities and observed algebraic tails decaying as 1/k4 at large momentum k, which originated from impurity-BEC interactions. The amplitudes of these tails exceeded those expected from two-body contact interactions at equilibrium in the trap. These unexpected algebraic tails were found to originate from the nontrivial dynamics of the expansion in the presence of impurity-bath interactions.
PHYSICAL REVIEW LETTERS
(2023)
Article
Optics
Veronica Vicuna-Hernandez, Filippo Cardano, Pegah Darvehi, Lorenzo Marrucci, Andrea Rubano, Bruno Piccirillo
Summary: Asymmetric polarization disclinations, namely monstars, can be created either by superimposing three spatial modes with circular polarization states or by using a modulated Poincare beam. The latter consists of an inseparable superposition of a circularly-polarized fundamental Gaussian beam TEM00 and a second beam with an opposite circular polarization and an azimuthally-modulated vortex. By analyzing the spatial modes involved in the superposition, the latter method allows for the generation of multiple disclinations and effective predictions of the resulting patterns at the design stage.
Article
Crystallography
Raouf Barboza, Sameh Bahwi, Stefano Marni, Liana Lucchetti
Summary: We studied the behavior of sessile ferroelectric liquid droplets near a pyroelectrically charged ferroelectric crystal without direct contact. The results showed that the polarizations of the fluid and solid materials are coupled, leading to two distinct effects: electromechanical instability of the droplets, resulting in the ejection of interfacial fluid jets, and slow motion of the droplets towards the ferroelectric solid due to dielectrophoretic force. These effects can potentially be separated based on the droplet size.
Article
Quantum Science & Technology
Valeria Cimini, Emanuele Polino, Federico Belliardo, Francesco Hoch, Bruno Piccirillo, Nicolo Spagnolo, Vittorio Giovannetti, Fabio Sciarrino
Summary: Adopting quantum resources for parameter estimation enables quantum sensors to achieve sensitivity beyond the standard quantum limit. We propose a method that allows the resources to reach the same power law of Heisenberg scaling without prior knowledge of the parameter. Experimental results show sub-standard quantum limit performances in measuring a rotation angle using high-order orbital angular momentum of single-photon states, achieving an error reduction >10 dB below the standard quantum limit. These results have implications for resource optimization in quantum sensing.
NPJ QUANTUM INFORMATION
(2023)
Article
Quantum Science & Technology
Lorenzo Cardarelli, Sergi Julia-Farre, Maciej Lewenstein, Alexandre Dauphin, Markus Mueller
Summary: This work investigates a realistic scenario for the quantum simulation of interaction-induced topological phases using cold Rydberg-dressed atoms in optical lattices. The phase diagram of spinless fermions on a checkerboard lattice is analyzed in the mean-field approximation, and the stability of the phases with respect to temperature and quantum fluctuations is studied. An implementation protocol is proposed to access the topological properties of the model in state-of-the-art cold atom quantum simulators.
QUANTUM SCIENCE AND TECHNOLOGY
(2023)
Review
Physics, Multidisciplinary
Irenee Frerot, Matteo Fadel, Maciej Lewenstein
Summary: This review discusses methods for detecting and characterizing quantum correlations in many-body systems, with a focus on scalable approaches. It introduces concepts such as quantum entanglement, Einstein-Podolsky-Rosen steering, and Bell nonlocality, both in the bipartite scenario and their generalizations to multipartite cases. The review also covers recent progress in characterizing quantum correlations, experimental techniques for preparing and measuring highly-entangled many-body systems, and the challenges associated with each platform. It concludes with a list of open problems in the field.
REPORTS ON PROGRESS IN PHYSICS
(2023)
Article
Physics, Multidisciplinary
Matteo Caldara, Andrea Richaud, Massimo Capone, Pietro Massignan
Summary: We have studied a superfluid in a planar annulus with vortices having massive cores. The analytical point-vortex model reveals that these massive vortices can have radial oscillations on top of their uniform precession. However, when the vortex mass exceeds a critical value, the oscillatory motion becomes unstable and the vortices are driven towards the edges of the annulus. By considering an analogy with the motion of a charged particle in a static electromagnetic field, we have developed a plasma orbit theory that accurately describes the trajectories even beyond the regime of small radial oscillations. These findings are supported by numerical solutions of coupled two-component Gross-Pitaevskii equations. We have also extended the analysis to a necklace of vortices symmetrically arranged within the annulus.
Article
Materials Science, Multidisciplinary
Piotr Sierant, Titas Chanda, Maciej Lewenstein, Jakub Zakrzewski
Summary: We investigate the dynamics of a single mobile impurity in a bath of Anderson localized particles in the regime of relatively strong disorder and interactions. We find that at short times, there is evidence of many-body localization, but at longer timescales, the impurity spreads subdiffusively and gradually delocalizes the Anderson insulator. The observed phenomenology includes subdiffusive growth of mean square displacement, power-law decay of density correlation functions, and power-law growth of entanglement entropy.
