Article
Physics, Multidisciplinary
B. S. Revathy, Victor Mukherjee, Uma Divakaran
Summary: In this study, a bath-engineered quantum engine (BEQE) is proposed to enhance the performance of finite-time quantum engines operating close to quantum phase transitions. By using the Kibble-Zurek mechanism and critical scaling laws, a protocol is formulated. In the case of free fermionic systems, BEQE enables finite-time engines to outperform engines operating in the presence of shortcuts to adiabaticity.
Article
Quantum Science & Technology
Tong Liu, Jin-Guo Liu, Heng Fan
Summary: Simulation of quantum materials is a significant application of quantum computers. Implementing nonunitary operations, which are widely used in classical approaches, on a quantum computer requires special design. By applying Grover's algorithm, a probabilistic method of implementing nonunitary operations can be extended to increase success probability without fidelity decreasing, and this method can be applied to problems such as imaginary time evolution and contraction of tensor networks on a quantum computer.
QUANTUM INFORMATION PROCESSING
(2021)
Article
Physics, Multidisciplinary
Wengang Zhang, Xiaolong Ouyang, Xianzhi Huang, Xin Wang, Huili Zhang, Yefei Yu, Xiuying Chang, Yanqing Liu, Dong-Ling Deng, L. -M. Duan
Summary: This study implements a non-Hermitian topological phase model and investigates it using a solid-state quantum simulator, demonstrating both integer and fractional winding numbers. The non-Hermitian topological phase with a fractional winding number is intrinsic to non-Hermitian systems and cannot be continuously deformed into any Hermitian topological phase.
PHYSICAL REVIEW LETTERS
(2021)
Article
Physics, Multidisciplinary
Dong An, Jin-Peng Liu, Lin Lin
Summary: We propose a simple method for simulating a general class of nonunitary dynamics, which does not rely on converting the problem into a dilated linear system problem or on the spectral mapping theorem. LCHS method achieves optimal cost in state preparation and demonstrates an application for open quantum dynamics simulation.
PHYSICAL REVIEW LETTERS
(2023)
Article
Materials Science, Multidisciplinary
Qinghao Wang, Zhi-Jian Li
Summary: We propose a one-dimensional model of nonunitary quantum walk with chiral symmetry. The vorticity, as a topological invariant, is found to equal the difference of winding numbers within both sides of topological defect. Meanwhile, a pair of vorticities can be derived in two time symmetric frames. Additionally, the appearing or disappearing of edge state at the boundary in an inhomogeneous system is not affected by nonunitary action.
RESULTS IN PHYSICS
(2022)
Review
Physics, Multidisciplinary
Jiang Zhang, Thi Ha Kyaw, Stefan Filipp, Leong-Chuan Kwek, Erik Sjoqvist, Dianmin Tong
Summary: This article introduces geometric and holonomic quantum computation and provides an overview of the theoretical and experimental progress in constructing geometric and holonomic quantum gates and combining them with other error-resistant techniques.
PHYSICS REPORTS-REVIEW SECTION OF PHYSICS LETTERS
(2023)
Article
Physics, Multidisciplinary
Joan A. Austrich-Olivares, Jose David Vergara
Summary: This paper introduces the concept of a quantum geometric tensor in a curved space with a parameter-dependent metric, which includes the quantum metric tensor and the corresponding Berry curvature. The parameter-dependent metric modifies the usual inner product, resulting in changes to the quantum metric tensor and Berry curvature by adding terms proportional to the derivatives of the metric determinant with respect to the parameters.
Article
Quantum Science & Technology
Li-Na Ji, Cheng-Yun Ding, Tao Chen, Zheng-Yuan Xue
Summary: The proposed scheme realizes geometric quantum gates with noncyclic and nonadiabatic evolution, inducing universal quantum gates in one step without path mutation and shortening the gate time significantly. Numerical simulations show that the constructed geometric gates have higher resistance to systematic errors and decoherence effects, with fidelities exceeding 99.97% for single-qubit and 99.84% for two-qubit gates.
ADVANCED QUANTUM TECHNOLOGIES
(2021)
Article
Physics, Multidisciplinary
Kyrylo Snizhko, Parveen Kumar, Nihal Rao, Yuval Gefen
Summary: The study explores generalized measurement sequences guiding a system along closed trajectories and identifies asymmetries in dephasing that may lead to partial suppression. This asymmetry, a manifestation of intrinsic chirality, leads to divergence in dephasing at certain protocol parameters, marking topological transitions in the phase factor induced by measurements.
PHYSICAL REVIEW LETTERS
(2021)
Article
Quantum Science & Technology
Fernando C. Lombardo, Ricardo S. Decca, Ludmila Viotti, Paula I. Villar
Summary: This article discusses the potential phenomenon of quantum friction between spatially separated bodies in relative motion through vacuum, proposing a novel experimental approach to detect this phenomenon by tracking the degradation of quantum coherence and measuring corrections to the geometric phase.
ADVANCED QUANTUM TECHNOLOGIES
(2021)
Article
Optics
Paula Villar, Alejandro Soba
Summary: In this study, we analyzed the impact of driving on the evolution of an initial maximally entangled state in a structured environment under weak and strong coupling conditions. Our focus was on the changes in maximal concurrence near and away from resonance, as well as the effects of introducing transverse coupling among particles. It was found that driving plays a crucial role in acquiring geometric phase for the maximally entangled state, which can be useful in identifying physical setups that preserve quantum properties in dissipative dynamics.
Article
Optics
Anant V. Varma, Jacob E. Muldoon, Sourav Paul, Yogesh N. Joglekar, Sourin Das
Summary: We study the violation of the Leggett-Garg inequality in a two-level system undergoing coherent dynamics described by a non-Hermitian Hamiltonian. By using postselection, we reproduce the violation of the inequality and connect it to the nonuniform speed of evolution on the Bloch sphere. Furthermore, we consider the effects of competing Lindblad dissipators on the postselected non-Hermitian dynamics and discuss the possibility of observing the violation in current experimental setups.
Article
Optics
R. A. Ribeiro, A. A. Matoso, L. E. Oxman, A. Z. Khoury, S. Padua
Summary: Fractional topological phase (FTP) in twoqudit photonic systems shows robustness to dephasing noise, which is experimentally observed. This robustness is achieved through hyperentangled photon pairs and theoretical description via Kraus maps, implemented experimentally with a spatial light modulator. FTP is a promising candidate for quantum processing and communication applications.
Article
Quantum Science & Technology
Karol Gietka, Lewis Ruks, Thomas Busch
Summary: In this study, we examine critical metrology and propose an improved critical quantum metrology protocol. By quenching a system beyond its critical point exhibiting a superradiant quantum phase transition, this protocol achieves an exponential increase of the quantum Fisher information in time. Using the setting of the Dicke model, we demonstrate the advantages of our protocol and explore a quantum gas coupled to a single-mode cavity field as a potential platform.
Article
Multidisciplinary Sciences
De-Hone Lin
Summary: This study investigates the effects of conformal deformation of physical parameters on the measurement, Berry phase, and resonance of a spin. The evolution path of the Berry phase can be tunable by the conformal index, and the resonance frequency follows a quantization rule based on the Rabi frequency without deformation.
Article
Meteorology & Atmospheric Sciences
Luz Calvo, Isadora Christel, Marta Terrado, Fernando Cucchietti, Mario Perez-Montoro
Summary: The visual communication of climate information is crucial for climate services, and translating multidimensional data to visual channels requires consideration of users' cognitive capacity. Utilizing user-centered design, interaction, and cognitive aspects can improve user experience in climate information visualization.
BULLETIN OF THE AMERICAN METEOROLOGICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
Cesar D. Fosco, Fernando C. Lombardo, Francisco D. Mazzitelli
Summary: By studying the emission probability of an atom in non-relativistic motion and its interaction with a static graphene plate, we found that the emission probability increases when the atom is near the plate and oscillating perpendicular to it, while there is a suppression for parallel oscillations. We also explored the phenomenon of quantum friction on an atom moving parallel to the plate, showing that friction only occurs when the atom's velocity exceeds the Fermi velocity of electrons in graphene.
Article
Public, Environmental & Occupational Health
Isabel Graupera, Maja Thiele, Ann T. Ma, Miquel Serra-Burriel, Judit Pich, Nuria Fabrellas, Llorenc Caballeria, Robert J. de Knegt, Ivica Grgurevic, Mathias Reichert, Dominique Roulot, Joern M. Schattenberg, Juan M. Pericas, Paolo Angeli, Emmanuel A. Tsochatzis, Indra Neil Guha, Montserrat Garcia-Retortillo, Rosa M. Morillas, Rosario Hernandez, Jordi Hoyo, Matilde Fuentes, Anita Madir, Adria Juanola, Anna Soria, Marta Juan, Marta Carol, Alba Diaz, Sonke Detlefsen, Pere Toran, Celine Fournier, Anne Llorca, Phillip N. Newsome, Michael Manns, Harry J. de Koning, Feliu Serra-Burriel, Fernando Cucchietti, Anita Arslanow, Marko Korenjak, Laurens van Kleef, Josep Lluis Falco, Patrick S. Kamath, Tom H. Karlsen, Laurent Castera, Frank Lammert, Aleksander Krag, Pere Gines
Summary: This study aims to investigate the utility of non-invasive tools in identifying individuals with asymptomatic, advanced chronic liver disease in the general population. With 30,000 subjects from eight European countries, the study will assess liver stiffness and bloodwork to evaluate the cost-effectiveness of such screening tools.
Article
Urban Studies
Irene Meta, Fernando M. Cucchietti, Diego Navarro-Mateu, Eduardo Graells-Garrido, Vicente Guallart
Summary: This paper introduces the City Physiology, a new conceptual framework for integrating city layers in designing holistic simulators. Through literature review and extracting interactions between urban systems, the framework not only provides a conceptual tool for holistic simulations, but also enables the discovery of new research lines.
Article
Physics, Multidisciplinary
Nicolas F. Del Grosso, Fernando C. C. Lombardo, Francisco D. D. Mazzitelli, Paula I. I. Villar
Summary: This paper presents a shortcut to adiabaticity (STA) for controlling an optomechanical cavity with two moving mirrors, which provides fast and precise protocols for implementing quantum operations. By providing reference trajectories, analytical expressions for effective trajectories that implement an STA for the quantum field inside the cavity are found. Numerical solutions for different reference protocols confirm the successful implementation of the STA and reveal some general features of the effective trajectories.
Correction
Public, Environmental & Occupational Health
Isabel Graupera, Maja Thiele, Ann T. Ma, Miquel Serra-Burriel, Judit Pich, Nuria Fabrellas, Llorenc Caballeria, Robert J. de Knegt, Ivica Grgurevic, Mathias Reichert, Dominique Roulot, Joern M. Schattenberg, Juan M. Pericas, Paolo Angeli, Emmanuel A. Tsochatzis, Indra Neil Guha, Montserrat Garcia-Retortillo, Rosa M. Morillas, Rosario Hernandez, Jordi Hoyo, Matilde Fuentes, Anita Madir, Adria Juanola, Anna Soria, Marta Juan, Marta Carol, Alba Diaz, Soenke Detlefsen, Pere Toran, Guillem Pera, Celine Fournier, Anne Llorca, Phillip N. Newsome, Michael Manns, Harry J. de Koning, Feliu Serra-Burriel, Fernando Cucchietti, Anita Arslanow, Marko Korenjak, Laurens van Kleef, Josep Lluis Falco, Patrick S. Kamath, Tom H. Karlsen, Laurent Castera, Frank Lammert, Aleksander Krag, Pere Gines
Article
Computer Science, Software Engineering
Luz Calvo, Fernando Cucchietti, Mario Perez-Montoro
Summary: This study aims to measure the efficiency of four static maps in presenting changes over time from a user experience perspective. The results show that certain types of maps work better to show global trends, while other types are more useful when analyzing regional trends or detecting specific patterns. On a qualitative level, familiarity with map representations is often valued more, despite lower measured success rates.
IEEE TRANSACTIONS ON VISUALIZATION AND COMPUTER GRAPHICS
(2023)
Article
Astronomy & Astrophysics
Cesar D. Fosco, Fernando C. Lombardo, Francisco D. Mazzitelli
Summary: In this study, we evaluate the probability of (de)excitation and photon emission from a neutral, moving, nonrelativistic atom coupled to the quantum electromagnetic field in the presence of a thin, perfectly conducting plane (mirror). These results extend the previous findings from a scalar model to a more realistic scenario.
Article
Computer Science, Artificial Intelligence
Carlos Garcia Calatrava, Yolanda Becerra Fontal, Fernando M. Cucchietti
Summary: Time series databases are designed to handle large amounts of data efficiently, while also reducing the requested resources. This research proposes a holistic approach for databases following Cascading Polyglot Persistence to further improve resource utilization. The approach effectively reduces the cluster size and offers efficient cluster growth compared to theoretical perfect scaling, all while ensuring data safety.
BIG DATA AND COGNITIVE COMPUTING
(2022)
Article
Computer Science, Information Systems
Carlos Garcia Calatrava, Yolanda Becerra, Fernando M. Cucchietti
Summary: This paper proposes a comprehensive approach to improve the performance and efficiency of time-series databases, utilizing a polyglot-based approximation to optimize data storage while considering the characteristics of the data flow. Experimental results show that this approach outperforms mainstream time-series databases in terms of speed and performance.
Article
Optics
Nicolas F. Del Grosso, Fernando C. Lombardo, Francisco D. Mazzitelli, Paula I. Villar
Summary: This paper describes a method to implement shortcuts to adiabaticity for a massless scalar field inside a cavity with a moving wall. The approach is based on the known solution to the problem that exploits the conformal symmetry, and the shortcuts occur only when there is no dynamical Casimir effect. Possible experimental realizations using superconducting circuits are discussed.
Article
Astronomy & Astrophysics
Cesar D. Fosco, Fernando C. Lombardo, Francisco D. Mazzitelli
Summary: In this study, quantum dissipative effects due to the nonrelativistic, bounded, accelerated motion of a single neutral atom in the presence of a planar perfect mirror were investigated. A simplified model, in which a moving scalar atom is coupled to a quantum real scalar field under either Dirichlet or Neumann boundary conditions, was considered. The vacuum persistence amplitude and the resulting vacuum decay probability were computed using an expansion in powers of the departure of the atom with respect to a static average position. Transition amplitudes corresponding to the excitation of the atom plus the emission of a particle were evaluated, and it was shown that the vacuum decay probabilities matched the results obtained by integrating the transition amplitudes over the directions of the emitted particle. The spontaneous emission rate of an oscillating atom initially in an excited state was also computed.
Article
Optics
Ludmila Viotti, Fernando C. Lombardo, Paula Villar
Summary: We apply a generalized kinematic approach to calculate the geometric phases acquired in two types of Jaynes-Cummings models, providing a comprehensive quantum description for the interaction between a two-level system and a single mode of the electromagnetic field in a perfect or dissipative cavity. Our method allows for a comparison of the geometric phases obtained in these models, enabling a thorough characterization of the corrections introduced by the presence of the environment. We also offer geometric interpretations for the observed behaviors, demonstrating the robustness of the geometric phase under nonunitary evolution when the resonance condition is satisfied.
Article
Optics
Nicolas F. Del Grosso, Fernando C. Lombardo, Francisco D. Mazzitelli, Paula Villar
Summary: Efficiency of the quantum Otto cycle applied to a superconducting cavity is analyzed. It is found that in a nonadiabatic regime, the efficiency of the quantum cycle is affected by the dynamical Casimir effect, which induces quantum friction and lowers the efficiency. However, this effect can be avoided by specific temporal evolutions of the boundary conditions, leading to improved efficiency.
Article
Optics
Ludmila Viotti, Fernando C. Lombardo, Paula Villar
Summary: The concept of quantum friction and the challenges of experimental detection are introduced, with a proposed indirect method of demonstrating quantum friction through measuring coherence in atoms. The study shows that noncontact friction enhances decoherence in moving atoms, and this effect can be intensified by selecting specific particle and material parameters.
