Article
Quantum Science & Technology
Ronen M. Kroeze, Brendan P. Marsh, Kuan-Yu Lin, Jonathan Keeling, Benjamin L. Lev
Summary: In this work, a confocal-cavity-QED microscope is used to achieve cooperativity exceeding 110, which is comparable to the best single-mode cavities. This is made possible by the dispersive coupling to the atoms of many near-degenerate modes in the cavity, providing important insights for studying quantum many-body physics in the driven-dissipative setting.
Article
Optics
Asha Devi, Sarath D. Gunapala, Malin Premaratne
Summary: A new cavity quantum electrodynamic system is proposed, focusing on the strong coupling between the cavity and atom, and the influence of external drives on higher energy levels. The study shows that intracavity photon numbers can be enhanced even without population inversion under certain conditions.
Article
Materials Science, Multidisciplinary
C. Y. Hu, F. H. Yang
Summary: This study investigates giant optical circular birefringence induced by a single quantum dot confined spin, and presents a method for calculating the n-photon GCB probed with quantum light. By using quantum light instead of classical light, quantum nonlinearity related to multiphoton transitions can be observed more efficiently, facilitating multi-photon operations for quantum gates and transistors.
Article
Astronomy & Astrophysics
Nikhil Kalyanapuram
Summary: The authors reinterpret the soft S matrices as correlation functions of certain two-dimensional models of topological defects and point out the double-copy structure between the soft photon and soft graviton cases. They propose a putative classical double copy between the corresponding topological models and rederive gauge invariance and the equivalence principle as Ward identities of the two-dimensional theories.
Article
Physics, Multidisciplinary
Robert J. Lewis-Swan, Diego Barberena, Julia R. K. Cline, Dylan J. Young, James K. Thompson, Ana Maria Rey
Summary: The proposal suggests simulating dynamical phases of a BCS superconductor using cold atoms trapped in an optical cavity, with effective Cooper pairs encoded via internal states of the atoms and attractive interactions realized through the exchange of virtual photons. By controlling the interaction strength and dispersion relation of the effective Cooper pairs, exploration of the full dynamical phase diagram of the BCS model is enabled. This proposal opens the door for studying the nonequilibrium features of quantum magnetism and superconductivity through atom-light interactions in cold atomic gases.
PHYSICAL REVIEW LETTERS
(2021)
Article
Chemistry, Physical
Beatriz Perez-Gonzalez, Alvaro Gomez-Leon, Gloria Platero
Summary: This study explores the physics of topological lattice models immersed in c-QED architectures with arbitrary coupling strength with the photon field. It proposes the use of cavity transmission as a topological marker and studies its behavior. The specific case of a fermionic Su-Schrieffer-Heeger (SSH) chain coupled to a single-mode cavity is used to illustrate the findings, which confirm that the cavity can act as a quantum sensor for topological phases. The persistence of topological features and the calculation of entanglement entropy are also discussed.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2022)
Article
Multidisciplinary Sciences
Rosario R. Riso, Tor S. Haugland, Enrico Ronca, Henrik Koch
Summary: The authors introduce a fully consistent ab-initio method of molecular orbital theory applicable to material systems in quantum electrodynamics environments. The method can be used to predict and explain modifications of molecular properties due to cavity induced effects.
NATURE COMMUNICATIONS
(2022)
Article
Astronomy & Astrophysics
Lianna A. Akopyan, Dmitrii A. Trunin
Summary: Nonlinear terms in the equations of motion can cause secular growth in loop corrections to correlation functions, affecting particle production by nonuniformly moving ideal mirror and extending to ideal vibrating cavity and single semitransparent mirror. Two-loop correction to the Keldysh propagator quadratically grows with time in both cases, indicating breakdown of semiclassical approximation and importance of nonlinearities in the dynamical Casimir effect for large evolution times.
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
Hong Xie, Le-Wei He, Chang-Geng Liao, Zhi-Hua Chen, Xiu-Min Lin
Summary: We propose a scheme for realizing robust optical entanglement in cavity optomagnonics, where two optical whispering gallery modes couple to a magnon mode in a YIG sphere. The simultaneous realization of beam-splitter-like and two-mode squeezing magnon-photon interactions can be achieved when the optical modes are driven by external fields. The entanglement between the optical modes is generated through their coupling with magnons, and the effects of initial thermal occupations of magnons can be eliminated through destructive quantum interference between the bright modes of the interface. Additionally, the excitation of the Bogoliubov dark mode protects the optical entanglement from thermal heating effects.
Article
Optics
Hong Xie, Le-Wei He, Chang-Geng Liao, Zhi-Hua Chen, Xiu-Min Lin
Summary: We propose a scheme to achieve robust optical entanglement in cavity optomagnonics by coupling two optical whispering gallery modes (WGMs) to a magnon mode in a yttrium iron garnet (YIG) sphere. The simultaneous realization of beam-splitter-like and two-mode squeezing magnon-photon interactions is possible when the two optical WGMs are driven by external fields. The entanglement between the optical modes is generated via their coupling with magnons, and the effects of initial thermal occupations of magnons can be eliminated by exploiting destructive quantum interference between bright modes at the interface. Additionally, the excitation of the Bogoliubov dark mode protects the optical entanglement from thermal heating effects, relaxing the requirement of cooling the magnon mode. Our scheme has potential applications in magnon-based quantum information processing.
Article
Physics, Applied
Ramachandrarao Yalla, K. Muhammed Shafi, Kali P. Nayak, Kohzo Hakuta
Summary: In this study, we demonstrate the creation of a one-sided cavity on an optical nanofiber using a composite method. The one-sided composite cavity is designed to enhance channeling efficiency and its coupling characteristics are validated through numerical simulations and experiments.
APPLIED PHYSICS LETTERS
(2022)
Article
Optics
Xian-Li Yin, Wen -Bin Luo, Jie-Qiao Liao
Summary: We study the disentanglement dynamics of two giant atoms coupled to a one-dimensional waveguide, focusing on the non-Markovian effect due to the retardation. By considering the photon transmission time, we solve the time-delayed equations to obtain the evolution of entanglement between the two giant atoms. We find that the retardation-induced non-Markovianity leads to nonexponential decay and revivals of entanglement. We also investigate the dependence of disentanglement on different coupling configurations, detuning effect, initial-state phase effect, and initial state composition.
Article
Physics, Multidisciplinary
Juan Roman-Roche, Fernando Luis, David Zueco
Summary: A system of magnetic molecules coupled to microwave cavities undergoes the equilibrium superradiant phase transition, which is experimentally observable. The coupling effect is illustrated by the vacuum-induced ferromagnetic order in a quantum Ising model and the modification of the magnetic phase diagram of Fe-8 dipolar crystals, showcasing the cooperation between intrinsic and photon-induced spin-spin interactions. Finally, a transmission experiment demonstrates the quantum electrodynamical control of magnetism in resolving the transition.
PHYSICAL REVIEW LETTERS
(2021)
Article
Optics
Xinyu LI, Wei Zhao, Zhihai Wang
Summary: We investigate the scattering of a single photon in a phonon-photon hybrid system in the waveguide quantum electrodynamics (QED) scheme. An artificial giant atom dressed by phonons in a surface acoustic wave resonator interacts with a coupled resonator waveguide (CRW) nonlocally via two connecting sites. The phonon, along with the interference effect by nonlocal coupling, acts as a controller for photon transport in the waveguide. The study explores the modulation of transmission valley or window width in the near resonant regime and the effective dispersive coupling in the presence of a large detuned giant atom and a surface acoustic resonator.
Article
Engineering, Electrical & Electronic
Shane Kelly, Xuehui Zhang, Mohammed Tehranipoor, Andrew Ferraiuolo
JOURNAL OF ELECTRONIC TESTING-THEORY AND APPLICATIONS
(2015)
Article
Physics, Particles & Fields
Shane P. Kelly, Rahul Nandkishore, Jamir Marino
Article
Mechanics
Abhijit P. Chaudhari, Shane P. Kelly, Riccardo J. Valencia-Tortora, Jamir Marino
Summary: We investigate the dynamics of entanglement entropy in a quantum spin chain driven by a noisy signal with finite correlation time. The spreading speed of entanglement entropy decreases at strong dissipation, exhibiting the Zeno effect. We demonstrate that the noise averaged entanglement entropy can serve as a proxy for the heating and Zeno regimes.
JOURNAL OF STATISTICAL MECHANICS-THEORY AND EXPERIMENT
(2022)
Article
Optics
M. R. Lambert, Shan-Wen Tsai, Shane P. Kelly
Summary: We study the resonant coupling of a fully connected quantum spin model with a small environment of noninteracting spins and investigate the memory of initial state properties at long times. We find that certain properties of the initial state, in addition to total energy, can be remembered during the dynamics, even if they are not conserved. This memory effect occurs in a specific energy range, where an eigenstate quantum phase transition (ESQPT) takes place. The memory effect at that energy is robust to system-environment coupling until the coupling changes the energy of the ESQPT. This work reveals the independence of ESQPT memory on integrability and suggests that this mechanism may have a wider generality in preventing thermalization at ESQPTs.
Article
Optics
B. Danaci, I Yalcinkaya, B. Cakmak, G. Karpat, S. P. Kelly, A. L. Subasi
Summary: Researchers have found that, even in the delocalized regime, entanglement growth and relaxation occur slowly unlike most other models exhibiting a localization transition.
Article
Optics
Shane P. Kelly, Eddy Timmermans, S-W Tsai
Article
Materials Science, Multidisciplinary
Alexis Chacon, Dasol Kim, Wei Zhu, Shane P. Kelly, Alexandre Dauphin, Emilio Pisanty, Andrew S. Maxwell, Antonio Picon, Marcelo F. Ciappina, Dong Eon Kim, Christopher Ticknor, Avadh Saxena, Maciej Lewenstein
Article
Optics
Shane P. Kelly, Eddy Timmermans, S-W Tsai
Article
Materials Science, Multidisciplinary
Shane Kelly, S. -W. Tsai