Article
Physics, Multidisciplinary
Maryam Abbasi, Weijian Chen, Mahdi Naghiloo, Yogesh N. Joglekar, Kater W. Murch
Summary: This study investigates the quantum evolution of a non-Hermitian qubit in a dissipative superconducting transmon circuit. By tuning the system parameters in real-time to encircle an exceptional point, nonreciprocal quantum state transfer is achieved. The accumulation of chiral geometric phases during state transport verifies the quantum coherent nature of the evolution in the complex energy landscape, distinguishing between coherent and incoherent effects associated with encircling exceptional points. This work demonstrates a novel method for controlling quantum state vectors, highlighting the possibilities enabled through dynamical non-Hermitian control in quantum bath engineering.
PHYSICAL REVIEW LETTERS
(2022)
Article
Physics, Multidisciplinary
Junhua Dong, Qingmei Hu, Chang-Yin Ji, Bingsuo Zou, Yongyou Zhang
Summary: This study focuses on exceptional points in a topological waveguide-cavity coupled structure without the need for practical gain or loss, achieved through crystal-symmetry-protected topological photonic insulators. The breaking of parity-time symmetry is reflected by the change in the transmission-dip number in the optical transmission spectra, showcasing potential for robust optical devices with unique properties and functionalities based on exceptional points.
NEW JOURNAL OF PHYSICS
(2021)
Article
Materials Science, Multidisciplinary
Kazuki Sone, Yuto Ashida, Takahiro Sagawa
Summary: In this study, a three-dimensional topological laser that amplifies surface modes is proposed by exploring non-Hermitian topology. The topological surface laser is protected by nontrivial topology around exceptional points, enabling the realization of robust topological boundary modes without the need for judicious gain or symmetry protection.
Article
Optics
Lechen Yang, Guangrui Li, Xiaomei Gao, Ling Lu
Summary: Output power and beam quality are the main limitations for semiconductor lasers. The use of Dirac-vortex topological cavity overcomes the difficulty of single-mode selection and achieves excellent performance. These lasers can be used at important wavelengths for communication and safety, and also have the capability for multiple wavelengths, making them highly versatile.
Article
Multidisciplinary Sciences
Alex Dikopoltsev, Tristan H. Harder, Eran Lustig, Oleg A. Egorov, Johannes Beierlein, Adriana Wolf, Yaakov Lumer, Monika Emmerling, Christian Schneider, Sven Hoefling, Mordechai Segev, Sebastian Klembt
Summary: Topological insulator lasers are semiconductor laser arrays that utilize topology to create a single coherent laser from multiple emitters. The vertical-cavity surface-emitting laser (VCSEL) array demonstrated in this study emits at a single frequency and displays interference, showcasing the mutual coherence of the emitters. This experiment highlights the power of topological transport of light, where even with most of the light oscillating vertically, the small in-plane coupling forces individual emitters to behave as a single laser.
Article
Chemistry, Physical
Shaul Mukamel, Anqi Li, Michael Galperin
Summary: The infrared response of a two-mode vibrational system in a cavity is calculated using an effective non-Hermitian Hamiltonian derived from the nonequilibrium Green's function (NEGF) formalism. The degeneracies of the Hamiltonian (exceptional points, EPs) commonly used in the theoretical analysis of optical cavity spectroscopies are approximated and compared with the full NEGF. The qualitative limitations of the EP treatment are explained by examining the approximations used in the calculation.
JOURNAL OF CHEMICAL PHYSICS
(2023)
Article
Physics, Multidisciplinary
Tie Wang, Wei Zhang, Ji Cao, Hong-Fu Wang
Summary: In this paper, we propose a scheme to engineer a phonon laser in a non-Hermitian cavity magnomechanical system with dissipative magnon-photon coupling. The exceptional point (EP), emerging in the system and changing the properties of photons, magnons, and phonons, can be observed with a tunable dissipative magnon-photon coupling caused by the cavity Lenz's law. Our scheme provides a theoretical basis for phonon lasers in non-Hermitian systems and presents potential applications ranging from preparing coherent phonon sources to operating on-chip functional acoustic devices.
NEW JOURNAL OF PHYSICS
(2023)
Article
Physics, Multidisciplinary
Xi-Xi Bao, Gang-Feng Guo, Xu Yang, Lei Tan
Summary: We propose a scheme to realize high-fidelity topological state transfer in a one-dimensional cavity-magnon system using topological edge states. The cavity-magnon system can be mapped analytically to the tunable Su-Schrieffer-Heeger model with adjustable cavity-magnon coupling. By adjusting the coupling strength between adjacent cavity modes, the edge state can serve as a quantum channel for photonic and magnonic state transfers. Furthermore, our scheme enables quantum state transfers between photonic and magnonic states by changing the cavity-magnon coupling strength. Numerical simulations demonstrate the high-fidelity achievement of photonic, magnonic, and magnon-to-photon state transfers in the cavity-magnon system. Notably, three different types of quantum state transfer schemes can be transformed into each other in a controllable manner. The Su-Schrieffer-Heeger model based on the cavity-magnon system provides a tunable platform for engineering photon and magnon transport, with potential applications in topological quantum processing.
Article
Physics, Multidisciplinary
Jia-Ning Zhang, Jin-Xuan Han, Jin-Lei Wu, Jie Song, Yong-Yuan Jiang
Summary: We propose a fast topological beam splitter based on a generalized SSH model, which accelerates the beam splitting process significantly by accelerating the quantum state transfer. The model exhibits strong robustness against parameter disorders and system losses. Moreover, it can be extended to two-dimensional crossed-chain structures to realize a topological router with variable numbers of output ports.
FRONTIERS OF PHYSICS
(2023)
Article
Optics
Xianglian Liu, Lijiao Zhao, Di Zhang, Shaohua Gao
Summary: Researchers have proposed a topological cavity laser based on valley photonic crystals, utilizing topological edge states to design a cavity with high-quality factors, serving as an ultra-small light source. This laser can suppress backscattering and is immune to defects and disorders.
Article
Multidisciplinary Sciences
Hadiseh Nasari, Gisela Lopez-Galmiche, Helena E. Lopez-Aviles, Alexander Schumer, Absar U. Hassan, Qi Zhong, Stefan Rotter, Patrick LiKamWa, Demetrios N. Christodoulides, Mercedeh Khajavikhan
Summary: The adiabatic theorem in non-Hermitian systems exhibits a different behavior compared to closed quantum systems, resulting in state transfer schemes that have no counterpart in closed systems. Recent studies have shown that this behavior is not solely a result of winding around a non-Hermitian degeneracy, but is mostly attributed to the non-trivial landscape of the Riemann surfaces. In order to confirm this hypothesis, experiments were conducted to observe the field evolution and chiral state conversion in a slowly varying non-Hermitian system.
Article
Physics, Multidisciplinary
Tian Tian, Yichuan Zhang, Liang Zhang, Longhao Wu, Shaochun Lin, Jingwei Zhou, Chang-Kui Duan, Jian-Hua Jiang, Jiangfeng Du
Summary: In this study, robust unidirectional adiabatic pumping of phonons was achieved in a parametrically coupled nanomechanical system. By utilizing nearly degenerate local modes and their dynamic modulation, nonreciprocal transfer of phononic excitations from one edge to the other was achieved with near unit fidelity. This experiment paves the way for nonreciprocal phonon dynamics via adiabatic pumping and has significant implications for phononic quantum information processing.
PHYSICAL REVIEW LETTERS
(2022)
Article
Quantum Science & Technology
He Hao, Lingxiao Shan, Qi Zhang, Xiao-Chong Yu, Qihuang Gong, Ying Gu
Summary: This paper proposes a protocol for quantum state transfer using a diamond optomechanical cavity to achieve seamless frequency connection between solid spins and phonons, as well as between arbitrary frequencies and telecom photons. The scheme allows for the construction of universal scalable quantum networks and serves as a paradigm for optical quantum communications.
ADVANCED QUANTUM TECHNOLOGIES
(2021)
Article
Physics, Applied
Jose A. Medina-Vazquez, Jose G. Murillo-Ramirez, Evelyn Y. Y. Gonzalez-Ramirez, Sion F. F. Olive-Mendez
Summary: This theoretical study presents a topological photonic crystal based on the 2D Su-Schrieffer-Heeger model, with corner states induced by a rotational operation. The crystal exhibits inversion symmetry, allowing the simultaneous existence of two non-degenerated corner states in both weak and strong coupling regimes. The study explores the origin and evolution of these corner states and the emergence of distinctive effects such as the Purcell effect and Rabi splitting.
JOURNAL OF APPLIED PHYSICS
(2022)
Article
Chemistry, Multidisciplinary
Jonathan Jurkat, Sebastian Klembt, Marco De Gregorio, Moritz Meinecke, Quirin Buchinger, Tristan H. Harder, Johannes Beierlein, Oleg A. Egorov, Monika Emmerling, Constantin Krause, Christian Schneider, Tobias Huber-Loyola, Sven Hoefling
Summary: The introduction of topological physics to photonics has resulted in the development of robust photonic devices. While classical topological protection of light has been achieved, the utilization of quantum light sources in devices with topologically nontrivial resonances remains largely unexplored.
Editorial Material
Physics, Applied
Filippo Capolino, Mercedeh Khajavikhan, Andrea Alu
APPLIED PHYSICS LETTERS
(2022)
Article
Optics
Chi Xu, William E. Hayenga, Demetrios N. Christodoulides, Mercedeh Khajavikhan, Patrick LiKamWa
Summary: We demonstrate how the gain-loss contrast between two coupled identical resonators can be utilized to enhance the modulation frequency response of laser diodes. By adjusting the ratio of injection current levels, significant bandwidth improvement is achieved, up to 1.63 times the fundamental resonant frequency of individual devices.
Article
Optics
Sylvain Gigan, Ori Katz, Hilton B. de Aguiar, Esben Ravn Andresen, Alexandre Aubry, Jacopo Bertolotti, Emmanuel Bossy, Dorian Bouchet, Joshua Brake, Sophie Brasselet, Yaron Bromberg, Hui Cao, Thomas Chaigne, Zhongtao Cheng, Wonshik Choi, Tomas Cizmar, Meng Cui, Vincent R. Curtis, Hugo Defienne, Matthias Hofer, Ryoichi Horisaki, Roarke Horstmeyer, Na Ji, Aaron K. LaViolette, Jerome Mertz, Christophe Moser, Allard P. Mosk, Nicolas C. Pegard, Rafael Piestun, Sebastien Popoff, David B. Phillips, Demetri Psaltis, Babak Rahmani, Herve Rigneault, Stefan Rotter, Lei Tian, Ivo M. Vellekoop, Laura Waller, Lihong Wang, Timothy Weber, Sheng Xiao, Chris Xu, Alexey Yamilov, Changhuei Yang, Hasan Yilmaz
Summary: In the last decade, various tools such as wavefront shaping and computational methods have been developed to understand and control the propagation of light in complex mediums. This field has revolutionized the possibility of diffraction-limited imaging at depth in tissues, and a vibrant community is actively working on it.
JOURNAL OF PHYSICS-PHOTONICS
(2022)
Review
Physics, Multidisciplinary
Hui Cao, Allard Pieter Mosk, Stefan Rotter
Summary: This article summarizes the theoretical framework and experimental techniques for understanding and controlling multiple scattering of light in turbid media. Recent advancements in optical wavefront shaping and phase recording have allowed for the control of coherent light transport in complex media. These developments have resulted in significant progress in focusing and controlling light transmission and have practical applications in areas such as optical micro-manipulation.
Article
Multidisciplinary Sciences
Yevgeny Slobodkin, Gil Weinberg, Helmut Hoerner, Kevin Pichler, Stefan Rotter, Ori Katz
Summary: One of the key insights of non-Hermitian photonics is the concept of coherent perfect absorber (CPA), which can be achieved by reversing the operation of well-established concepts like lasers. This study demonstrates the possibility of overcoming the limitation of CPA by time-reversing a degenerate cavity laser based on a unique cavity that self-images any incident light field onto itself. The results show that placing a weak, critically coupled absorber into this cavity allows for nearly perfect absorption of any incoming wavefront, even complex and dynamically varying speckle patterns. This opens up new possibilities for applications in light harvesting, energy delivery, light control, and imaging.
Article
Engineering, Electrical & Electronic
Martin Belitsch, Dmitry N. Dirin, Maksym V. Kovalenko, Kevin Pichler, Stefan Rotter, Ahmed Ghalgaoui, Harald Ditlbacher, Andreas Hohenau, Joachim R. Krenn
Summary: The study demonstrates the feasibility of using geometrically simple monolithic microscale CdSe/CdS nanoplatelet lasers as a promising option for various photonic applications. The CdSe/CdS nanoplatelets show high gain factor and emission pulse shortening.
MICRO AND NANO ENGINEERING
(2022)
Article
Physics, Multidisciplinary
Jakob Huepfl, Nicolas Bachelard, Markus Kaczvinszki, Michael Horodynski, Matthias Kuehmayer, Stefan Rotter
Summary: The ability to levitate and cool mesoscopic objects using light forces is promising. However, scaling up from single to multiple particles in close proximity presents challenges in monitoring particle positions and engineering reactive light fields. This study presents a solution by utilizing a time-dependent scattering matrix to identify spatially modulated wavefronts, enabling the simultaneous cooling of multiple objects of arbitrary shapes. An experimental implementation is proposed involving stroboscopic scattering-matrix measurements and time-adaptive injections of modulated light fields.
PHYSICAL REVIEW LETTERS
(2023)
Review
Optics
Hui Cao, Tomas Cizmar, Sergey Turtaev, Tomas Tyc, Stefan Rotter
Summary: Light transport in a highly multimode fiber is complex and can be controlled using spatial wavefront shaping techniques. These techniques enable precise characterization of field propagation and tailor the transmitted light's spatial pattern, temporal profile, and polarization state. Multimode fibers find applications in imaging, endoscopy, optical trapping, and microfabrication. The output speckle pattern from a multimode fiber encodes information about the input light, allowing it to be retrieved from spatial measurements only. This article provides an overview of recent advances and breakthroughs in controlling light propagation in multimode fibers and discusses emerging applications.
ADVANCES IN OPTICS AND PHOTONICS
(2023)
Article
Optics
Xiyue sissi Wang, Romolo Savo, Andreas Maeder, Fabian Kaufmann, Jost Kellner, Andrea Morandi, Stefan Rotter, Riccardo Sapienza, Rachel Grange
Summary: We propose a graph-based model to study the multiple scattering of light in integrated LNOI networks, which can describe the tunable scattering behavior in an open network of single-mode integrated waveguides. The model is validated with experimental data from LNOI resonator devices and then used to demonstrate a novel platform for on-chip multiple scattering in large optical networks. By combining our simple graph-based model with LNOI's material properties, this platform enables control over randomness in large optical networks.
Article
Physics, Multidisciplinary
Wenzel Kersten, Nikolaus de Zordo, Oliver Diekmann, Tobias Reiter, Matthias Zens, Andrew N. Kanagin, Stefan Rotter, Joerg Schmiedmayer, Andreas Angerer
Summary: We investigate the superradiant emission of an inverted spin ensemble strongly coupled to a superconducting cavity. By rapidly inverting the spins and detuning them from the cavity, we can store the inversion for tens of milliseconds and observe the disappearance of the remaining transverse spin components. Triggering the resonance allows us to study the onset of superradiance, with a weak pulse shifting the superradiant burst to earlier times and imprinting its phase onto the emitted radiation. For long hold times, the inversion decreases below the threshold for spontaneous superradiance, enabling the amplification of microwave pulses using the stored energy in the ensemble passing through the cavity.
PHYSICAL REVIEW LETTERS
(2023)
Article
Optics
Konstantin Y. Bliokh, Ebrahim Karimi, Miles J. Padgett, Miguel A. Alonso, Mark R. Dennis, Angela Dudley, Andrew Forbes, Sina Zahedpour, Scott W. Hancock, Howard M. Milchberg, Stefan Rotter, Franco Nori, Sahin K. Ozdemir, Nicholas Bender, Hui Cao, Paul B. Corkum, Carlos Hernandez-Garcia, Haoran Ren, Yuri Kivshar, Mario G. Silveirinha, Nader Engheta, Arno Rauschenbeutel, Philipp Schneeweiss, Juergen Volz, Daniel Leykam, Daria A. Smirnova, Kexiu Rong, Bo Wang, Erez Hasman, Michela F. Picardi, Anatoly Zayats, Francisco J. Rodriguez-Fortuno, Chenwen Yang, Jie Ren, Alexander B. Khanikaev, Andrea Alu, Etienne Brasselet, Michael Shats, Jo Verbeeck, Peter Schattschneider, Dusan Sarenac, David G. Cory, Dmitry A. Pushin, Michael Birk, Alexey Gorlach, Ido Kaminer, Filippo Cardano, Lorenzo Marrucci, Mario Krenn, Florian Marquardt
Summary: Structured waves are found in all areas of wave physics, both classical and quantum, where the wavefields are inhomogeneous and cannot be approximated by a single plane wave. These complex wavefields with inhomogeneities are crucial in various fields such as nanooptics, photonics, quantum matter waves, acoustics, water waves, etc. This Roadmap surveys the role of structured waves in wave physics, providing background, current research, and anticipating future developments.
Article
Optics
Jakob Huepfl, Nicolas Bachelard, Markus Kaczvinszki, Michael Horodynski, Matthias Kuehmayer, Stefan Rotter
Summary: The opportunity to manipulate small-scale objects pushes our understanding of physics to its limits. Levitation, an interdisciplinary field utilizing light fields to optically levitate nanoparticles, holds great promise in this regard. By cooling levitated systems towards their quantum ground state, mesoscopic quantum properties can potentially be observed. While the focus of levitation has mainly been on manipulating individual objects with simple shapes, the field is now moving towards the control of more complex structures. However, current cooling techniques are not readily applicable to coupled many-body systems, requiring new approaches. This article presents a method based on light modulation in the far field to cool multiple nano-objects simultaneously, providing a theoretical and numerical study of the cooling performance and method's robustness against environmental parameters.
Article
Optics
Michael Horodynski, Tobias Reiter, Matthias Kuhmayer, Stefan Rotter
Summary: This study introduces a protocol that determines the wave states producing the optimal tractor force by solving a simple eigenvalue problem. Numerical simulations demonstrate the efficacy of this method for various targets, and the diffractive nature of waves enables the tractor beam to work even for targets that cannot be explained by geometric optics.
Article
Optics
Pawel S. Jung, Midya Parto, Georgios G. Pyrialakos, Hadiseh Nasari, Katarzyna Rutkowska, Marek Trippenbach, Mercedeh Khajavikhan, Wieslaw Krolikowski, Demetrios N. Christodoulides
Summary: We theoretically investigate a Thouless pumping scheme in the one-dimensional topological Su-Schrieffer-Heeger (SSH) model when implemented in a discrete nematic liquid crystal arrangement. Numerical results show that for an electrically controlled SSH waveguide array, edge-to-edge light transport can be achieved at low power levels. However, at higher powers, the transport is frustrated by light-induced nonlinear defect states, leading to robust all-optical switching.
Article
Optics
Mahmoud A. Selim, Fan O. Wu, Huizhong Ren, Mercedeh Khajavikhan, Demetrios Christodoulides
Summary: This work investigates the emission intensity patterns in nonlinear waveguide arrays using concepts from optical thermodynamics. The researchers derived an exact equation describing the response of a nonlinear array and found that the patterns and brightness are governed by the optical temperature and chemical potential. The results obtained from thermodynamics were in good agreement with numerical simulations.
