Article
Multidisciplinary Sciences
C. F. Lo
Summary: This study explores the spectral collapse in the two-photon Rabi model, finding that the light-matter interaction and spin-flipping play competing roles in influencing the radiation mode. The dominance of the light-matter interaction can lead to spectral collapse when its coupling strength exceeds a critical value, but incomplete collapse may occur at the critical coupling. Additionally, the energy difference between atomic levels also affects the extent of incomplete collapse.
SCIENTIFIC REPORTS
(2021)
Article
Physics, Multidisciplinary
Li-Bao Fan, Chuan-Cun Shu, Daoyi Dong, Jun He, Niels E. Henriksen, Franco Nori
Summary: We present a combined analytical and numerical study for coherent terahertz control of a single molecular polariton. We derive an analytical solution of a pulse-driven quantum Jaynes-Cummings model to achieve complete quantum coherent control of the polariton. This study offers a new strategy to study rotational dynamics in the strong-coupling regime and has direct applications in polariton chemistry and molecular polaritonics.
PHYSICAL REVIEW LETTERS
(2023)
Article
Physics, Multidisciplinary
Jing-Ying Wei, Qing Wang, Jian Jing
Summary: The study reveals the supersymmetric properties of a charged planar Dirac oscillator coupling to a uniform perpendicular magnetic field, demonstrating an N = 2 supersymmetric structure in both commutative and noncommutative cases. Additionally, it shows that the generators of the supersymmetric algebras can be converted to ones containing only left or right-handed chiral phonons through unitary transformations.
Article
Physics, Multidisciplinary
Thomas Allcock, Wolfgang Langbein, Egor A. Muljarov
Summary: In this study, we propose an exact analytical approach to investigate the optical response of a two-level system coupled to a microcavity. By increasing the pulse area of the excitation field, we are able to form a quantum Mollow quadruplet, which quantizes the semiclassical Mollow triplet.
PHYSICAL REVIEW LETTERS
(2022)
Article
Optics
Antti Vaaranta, Marco Cattaneo, Russell E. Lake
Summary: We investigate the dynamics of transmon qubits in the presence of noise from an impedance-matched resistor embedded in the qubit control line. By deriving the circuit Hamiltonian and utilizing the block diagonalization method, we obtain a quantitative description of the qubit decoherence rate and its dependence on the number of thermal photons in the readout resonator. Our findings reveal that increasing the dissipation rate of the resonator beyond the dispersive strong regime can lead to remarkably improved qubit decoherence rates.
Article
Optics
Yi Ren, Shouhui Duan, Wenzhi Xie, Yongkang Shao, Zhenglu Duan
Summary: This study proposes a process to generate antibunched photon pairs in a nondegenerate optical parametric oscillator, where strong antibunching behavior and high correlation between photons are observed when certain system parameters are met. The research also finds that conventional photon blockade contributes to this phenomenon and that fundamental mode photons can blockade subharmonic mode photons, labeled as heterogeneous photon blockade.
Article
Optics
Jia-Hao Lu, Wen Ning, Xin Zhu, Fan Wu, Li-Tuo Shen, Zhen-Biao Yang, Shi-Biao Zheng
Summary: Quantum sensing improves measurement accuracy by utilizing the unique properties of quantum systems. This study explores an alternative approach to construct a quantum Rabi model analog for sensing, by exploiting the criticality appearing in the Jaynes-Cummings model, thus relaxing the implementation requirements to some extent.
Article
Quantum Science & Technology
Christopher Mayero
Summary: A comparison of photon statistics is made between the anti-Jaynes-Cummings interaction and the well-known Jaynes-Cummings interaction. It is found that the field is sub-Poissonian in the anti-Jaynes-Cummings interaction under certain limits of sum frequency parameter and mean photon number. Conversely, the photon statistics in the Jaynes-Cummings interaction is predominantly super-Poissonian within the corresponding limits of frequency detuning.
QUANTUM INFORMATION PROCESSING
(2023)
Article
Optics
G. G. Amosov, A. S. Mokeev, A. N. Pechen
Summary: Quantum error correction is crucial for quantum information transmission and quantum computing. This study utilizes the theory of noncommutative operator graphs to analyze error correction in scenarios where a finite-dimensional quantum system is coupled to an infinite-dimensional system, with a specific focus on a qubit coupled via the Jaynes-Cummings Hamiltonian with a bosonic coherent field. By extending the theory and constructing noncommutative graphs using coherent states, the researchers identify the quantum anticlique and analyze its behavior in relation to the frequencies of the qubit and bosonic field. The proposed scheme can be applied to systems with similar spectrum decompositions as the JC model, providing insights into error-correcting subspaces for experimental parameter values.
Article
Physics, Multidisciplinary
Anas Ahmed Othman
Summary: This study investigates the interaction between Mth coherent state and an atom, revealing a resolution phenomenon and the periodicity and wider range coverage of Mth CS with large M values. Various classical and non-classical features are discussed for the measurements, and potential applications are proposed.
INTERNATIONAL JOURNAL OF THEORETICAL PHYSICS
(2021)
Article
Multidisciplinary Sciences
Marius Bild, Matteo Fadel, Yu Yang, Uwe von Lupke, Phillip Martin, Alessandro Bruno, Yiwen Chu
Summary: According to quantum mechanics, a physical system can exist in a superposition of its possible states. However, it is still unclear why this is not observed in macroscopic objects. This study presents the preparation of a mechanical resonator in Schrodinger cat states of motion, where a large number of atoms are in a superposition of two oscillations. The results offer the potential to explore the boundary between quantum and classical worlds and have applications in quantum information processing and metrology.
Article
Quantum Science & Technology
Mazhar Ali
Summary: The study shows that three uncorrelated atoms cannot be genuinely entangled if they share classical correlations with another cavity. However, atomic states can achieve genuine multipartite entanglement if highly entangled with other cavities. This observation provides another technique for generating multipartite entangled atoms through JC-interactions.
QUANTUM INFORMATION PROCESSING
(2021)
Article
Quantum Science & Technology
Shuangshuang Fu, Shunlong Luo, Yue Zhang
Summary: The study investigates the dynamics of field nonclassicality in the Jaynes-Cummings model, revealing that different initial states have varying effects on the field dynamics and nonclassicality. The results indicate that nonclassical field states can be generated in most cases.
QUANTUM INFORMATION PROCESSING
(2021)
Article
Optics
Nour-Eddine Abouelkhir, Abdallah Slaoui, Hanane El Hadfi, Rachid Ahl Laamara
Summary: Recently, the Hilbert-Schmidt speed has been shown to improve interferometric phase in single-parameter quantum estimation. In this study, the concept was tested in a theoretical model involving a three-level atom and two classical monochromatic fields. The results demonstrate that the Hilbert-Schmidt speed can detect the lower bound on the statistical estimation error and identify the optimal estimation regions.
JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS
(2023)
Article
Physics, Multidisciplinary
B. Mojaveri, A. Dehghani, Z. Ahmadi
Summary: This study investigates the impact of external classical fields on the positive work condition and efficiency of a quantum heat engine, showing that significant work can be extracted from any temperature reservoir under local classical fields and achieving classical Carnot efficiency in the low-temperature regime. Additionally, by adjusting the intensity of local classical fields, the entanglement between thermal atoms can be maintained, acting as a resource for positive work extraction during the cold bath stage.
Article
Multidisciplinary Sciences
V Ardizzone, F. Riminucci, S. Zanotti, A. Gianfrate, M. Efthymiou-Tsironi, D. G. Suarez-Forero, F. Todisco, M. De Giorgi, D. Trypogeorgos, G. Gigli, K. Baldwin, L. Pfeiffer, D. Ballarini, H. S. Nguyen, D. Gerace, D. Sanvitto
Summary: This study discovered bound states in the continuum (BICs) in a planar photonic crystal lattice, which have a long lifetime and are not affected by radiation. The researchers also demonstrated non-equilibrium Bose-Einstein condensation occurring in the BIC. By combining bosonic condensation and symmetry-protected radiation eigenmodes, they showed a way to impart topological properties onto macroscopic quantum states.
Article
Nanoscience & Nanotechnology
Jiaxin Zhao, Antonio Fieramosca, Ruiqi Bao, Wei Du, Kevin Dini, Rui Su, Jiangang Feng, Yuan Luo, Daniele Sanvitto, Timothy C. H. Liew, Qihua Xiong
Summary: Researchers have observed nonlinear optical parametric polaritons in a WS2 monolayer microcavity, which opens up new possibilities for the development of all-optical valley polariton nonlinear devices.
NATURE NANOTECHNOLOGY
(2022)
Article
Physics, Applied
A. Opala, R. Panico, V. Ardizzone, B. Pieta, J. Szczytko, D. Sanvitto, M. Matuszewski, D. Ballarini
Summary: This paper proposes and realizes an optical system where highly efficient backpropagation training can be applied through a set of highly nonlinear, nontunable nodes, demonstrating high classification accuracy.
PHYSICAL REVIEW APPLIED
(2022)
News Item
Optics
Fabrice P. Laussy
Summary: The study of a light-matter fluid of exciton-polaritons verifies the presence of an inverse energy cascade in two-dimensional quantum turbulence.
Article
Optics
R. Panico, P. Comaron, M. Matuszewski, A. S. Lanotte, D. Trypogeorgos, G. Gigli, M. De Giorgi, V. Ardizzone, D. Sanvitto, D. Ballarini
Summary: Turbulent phenomena are observed in both classical and quantum fluids, with the latter requiring precise manipulation of quantum fluids. In this study, we measured the turbulent dynamics of a two-dimensional quantum fluid of exciton-polaritons, a hybrid light-matter quasiparticle. The formation of clusters of quantum vortices was triggered by the increase of the incompressible kinetic energy per vortex, demonstrating the tendency of the vortex-gas towards highly excited configurations despite the dissipative nature of the system. These findings provide a foundation for investigating quantum turbulence in two-dimensional fluids of light.
Article
Physics, Multidisciplinary
Eduardo Zubizarreta Casalengua, Elena del Valle, Fabrice P. Laussy
Summary: In this paper, we discuss the two-photon correlations from side peaks formed when a two-level system emitter is coherently driven with a detuning between the driving source and the emitter. We combine the theories of frequency-resolved photon correlations and homodyning to provide a neat picture compatible with perturbative two-photon scattering. This has implications for controlling, enhancing, and exploring new regimes of multiphoton emission. We also propose a way to demonstrate the quantum coherent nature of the process solely through photoluminescence observations.
Editorial Material
Multidisciplinary Sciences
Alejandro Gonzalez-Tudela
Article
Multidisciplinary Sciences
Inaki Garcia-Elcano, Jaime Merino, Jorge Bravo-Abad, Alejandro Gonzalez-Tudela
Summary: Fermi arcs are surface states connecting topologically distinct Weyl points, which showcase the topological aspects of Weyl physics. We investigate the photonic counterpart of these states and demonstrate unique phenomena. We show how to image the Fermi arcs through the spontaneous decay of emitters coupled to the system's border. We also demonstrate the potential of Fermi arc surface states as a robust quantum link, enabling perfect quantum state transfer and the formation of highly entangled states.
Article
Multidisciplinary Sciences
Anna Grudinina, Maria Efthymiou-Tsironi, Vincenzo Ardizzone, Fabrizio Riminucci, Milena De Giorgi, Dimitris Trypogeorgos, Kirk Baldwin, Loren Pfeiffer, Dario Ballarini, Daniele Sanvitto, Nina Voronova
Summary: Characterizing the spectra of low-lying elementary excitations is crucial for studying bosonic quantum fluids, but the low occupancy of non-condensate states makes them difficult to observe. However, recent advancements in coupling electromagnetic resonance to semiconductor excitons have allowed the realization of low-threshold Bose-Einstein condensation in symmetry-protected bound states in the continuum. In this study, the authors investigate the peculiarities of the Bogoliubov excitation spectrum in this system, revealing interesting features such as energy-flat parts, linearization at non-zero momenta, and anisotropic sound velocity.
NATURE COMMUNICATIONS
(2023)
Article
Quantum Science & Technology
Alvaro Gomez-Leon, Tomas Ramos, Alejandro Gonzalez-Tudela, Diego Porras
Summary: In this study, we investigate the phenomenon of topological amplification in arrays of parametric oscillators. We identify two phases of topological amplification, both having directional transport and exponential gain with the number of sites, with one phase also featuring squeezing. We also discover a topologically trivial phase with zero-energy modes that produces amplification but lacks the robust topological protection of the other phases. We characterize the resilience to disorder of the different phases as well as their stability, gain, and noise-to-signal ratio, and discuss their experimental implementation using state-of-the-art techniques.
Article
Materials Science, Multidisciplinary
F. P. M. Mendez-Cordoba, F. J. Rodriguez, C. Tejedor, L. Quiroga
Summary: We study the ability to modify the connectivity of Majorana fermions through selective cavity coupling. By selectively accessing light-matter interactions with specific physical sites, we demonstrate the displacement of topological qubits (TQs) associated with nonlocal Majorana fermion pairing from the edges to the bulk of a topological chain. Our comprehensive study using density matrix renormalization group method confirms analytical insights and reveals emergent cavity photon features. Furthermore, we show that the development of high nontrivial matter correlations leaves measurable nonclassical photon imprints in the cavity, providing innovative ways to dynamically generate TQ nonlocal correlations in hybrid photonic solid-state systems.
Article
Physics, Multidisciplinary
C. Vega, D. Porras, A. Gonzalez-Tudela
Summary: Topological insulators have topologically protected boundary modes linked to their bulk invariant. In two-dimensional topological insulators, these boundary modes are chiral, one-dimensional propagating modes along the edges. We demonstrate how to interface these topologically protected modes with quantum emitters, resulting in quasiquantized decay rates and spatial separation of spontaneous emission. Furthermore, we show how to generate single-photon time-bin entangled states and selectively interact with different channels using nonlocal light-matter couplings.
PHYSICAL REVIEW RESEARCH
(2023)
Article
Optics
Maria Blanco de Paz, Alejandro Gonzalez-Tudela, Paloma A. Huidobro
Summary: In this study, we discuss the emergence and manipulation of generalized Dirac cones in the subradiant collective modes of a subwavelength dipolar array. By introducing uniaxial anisotropy in the lattice, the dispersion relations of the Dirac cones can be modified, including the tilting of the cones, changes in the local density of states, the emergence of semi-Dirac points, and the anisotropic movement of the cones. These energy dispersions have significant effects on the dynamics of local probes.
Article
Optics
Cristian Tabares, Erez Zohar, Alejandro Gonzalez-Tudela
Summary: This study demonstrates how to utilize multilevel emitters to design photon-mediated interactions between effective spin-1 systems and provides specific implementations based on the atomic level structure of alkali atoms. These results expand the application of the quantum simulation toolbox and enable the design of entangling gates among qutrits in cavity QED and quantum nanophotonic setups.
Article
Optics
Alejandro Vivas-Viana, Alejandro Gonzalez-Tudela, Carlos Sanchez Munoz
Summary: This article reports a phenomenon occurring in open quantum systems where virtual states can acquire a sizable population in the long-time limit, even if they are not directly coupled to any dissipative channel. The authors describe this effect by introducing a hierarchical adiabatic elimination method and obtain analytical expressions of the timescale of metastability in general open quantum systems. These results are relevant for practical questions such as the generation of stable and metastable entangled states in dissipative systems of interacting qubits.
