Article
Optics
Miaodi Guo, Haifeng Li, Ning Li, Yajie Wu
Summary: We propose a scheme for tunable coherent perfect absorption (CPA) and near-perfect reflection (near CPR) in a three-level A-type atom-cavity system. By utilizing electromagnetically-induced-transparency-type interference induced by a coherent coupling laser, tunable near CPR at two-photon resonance can be achieved. Additionally, we demonstrate that CPA can be switched to the near-CPR regime by adjusting the linear absorption or gain using an incoherent pump field. This research provides a theoretical mechanism for manipulation of perfect absorption and reflection, with potential applications in coherent optical computing and communication.
Article
Physics, Multidisciplinary
T. Noh, Z. Xiao, X. Y. Jin, K. Cicak, E. Doucet, J. Aumentado, L. C. G. Govia, L. Ranzani, A. Kamal, R. W. Simmonds
Summary: Efficient control and measurement of qubits can be achieved by using parametric driving to introduce and remove interactions. This study demonstrates a design that couples two transmon qubits to a cavity using a shared SQUID, enabling independent tuning of each qubit's interaction with the cavity. The results show promising potential for various future applications in cavity QED.
Article
Physics, Multidisciplinary
Vincenzo Macri, Alberto Mercurio, Franco Nori, Salvatore Savasta, Carlos Sanchez Munoz
Summary: This paper demonstrates that spontaneous Raman scattering can be observed in cavity-QED systems without external enhancement or coupling to any vibrational degree of freedom. The Raman scattering processes are manifested as resonances in the emission spectrum, which become clearly visible as the cavity-QED system approaches the ultrastrong coupling regime. The paper provides a quantum mechanical description of this effect and shows that ultrastrong light-matter coupling is necessary for observing Raman scattering. This effect, along with its sensitivity to system parameters, opens up new possibilities for characterizing cavity QED setups and generating quantum states of light.
PHYSICAL REVIEW LETTERS
(2022)
Article
Optics
Grigoriy S. Mazhorin, Ilya N. Moskalenko, Ilya S. Besedin, Dmitriy S. Shapiro, Sergey Remizov, Walter Pogosov, Dmitry O. Moskalev, Anastasia A. Pishchimova, Alina A. Dobronosova, I. A. Rodionov, Alexey Ustinov
Summary: In this study, we experimentally explore a quantum metamaterial system consisting of 25 frequency-tunable qubits coupled to a common resonator on a superconducting chip. By measuring the transmission amplitude of an external microwave signal, we investigate the collective bright and dark modes. The results show the scaling of energy gap and the decay of mesoscopic fluctuations in the presence of controlled disorder.
Article
Nanoscience & Nanotechnology
Will Salmon, Chris Gustin, Alessio Settineri, Omar Di Stefano, David Zueco, Salvatore Savasta, Franco Nori, Stephen Hughes
Summary: In this study, we introduce master equations for open systems to compute emission spectra, photon flux rates, and quantum correlation functions by truncating in a manner consistent with the gauge principle. Explicit examples using both the dipole gauge and the Coulomb gauge are shown, which have significant disagreement with previous results obtained using the standard quantum Rabi model.
Article
Optics
Rida Nasir, Muhammad Rizwan Saleem, Asim Nisar, Muhammad Aftab Rafiq
Summary: Two electrically tunable Fabry-Perot microcavities filled with Twisted Nematic Liquid Crystal (TNLC) based on different mirror materials were designed, simulated, and fabricated in the near-infrared (NIR) regime. The Liquid Crystal Tunable Filter (LCTF) demonstrated wavelength-selection and tunable properties independent of polarization state of incoming light beam. Experimental results showed spectral shifts and distinct spectral channels, in agreement with simulated results.
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
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
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
Physics, Fluids & Plasmas
I. Ouatu, B. T. Spiers, R. Aboushelbaya, Q. Feng, M. W. von der Leyen, R. W. Paddock, R. Timmis, C. Ticos, K. M. Krushelnick, P. A. Norreys
Summary: A paradigm shift is approaching in the physics of laser-plasma interactions with the commissioning of multipetawatt laser facilities worldwide. This work proposes a way of measuring the focused intensity on target through the ionization of xenon gas.
Article
Astronomy & Astrophysics
Matteo Tamburini, Sebastian Meuren
Summary: The paper discusses the phenomenon of photon emission in the supercritical QED regime during high-energy lepton collisions, emphasizing the need to reduce multiple photon emissions to observe the high-energy peak in the photon spectrum.
Article
Physics, Multidisciplinary
Rocio Saez-Blazquez, Daniele de Bernardis, Johannes Feist, Peter Rabl
Summary: This study addresses the possibility of generating nonperturbative corrections to the ground state of a dipole by coupling it to a strongly confined electromagnetic vacuum. Two simplified cavity QED setups are considered, providing analytic expressions for the total ground-state energy and distinguishing between electrostatic and vacuum-induced contributions. The findings suggest that the presence of high-impedance modes can significantly increase the vacuum-induced effects, opening up the possibility of nonperturbative light-matter interactions.
PHYSICAL REVIEW LETTERS
(2023)
Article
Physics, Multidisciplinary
Shane P. Kelly, Ana Maria Rey, Jamir Marino
Summary: The study investigates the far-from-equilibrium dynamics of a many-body spin-boson model, finding that varying the frequency of photons can significantly alter the system's dynamical responses. When photons evolve at a similar rate as spins, they can induce qualitatively distinct frustrated dynamics, illustrating the resilience of glassylike dynamics in the presence of active photonic degrees of freedom. This suggests that disordered quantum many-body systems with resonant photons or phonons can exhibit a rich diagram of nonequilibrium responses, with potential applications in quantum information science in the near future.
PHYSICAL REVIEW LETTERS
(2021)
Article
Physics, Multidisciplinary
Huai-Hang Song, Wei-Min Wang, Yu-Tong Li
Summary: Polarization of positrons is observed in laser-solid interactions when the laser intensity exceeds a certain threshold. This polarization phenomenon is attributed to the asymmetrical laser fields that positrons undergo near the skin layer of overdense plasmas.
PHYSICAL REVIEW LETTERS
(2022)
Article
Quantum Science & Technology
Agustin Di Paolo, Thomas E. Baker, Alexandre Foley, David Senechal, Alexandre Blais
Summary: The study uses a tensor network method to compute the low-energy excitations of a large-scale fluxonium qubit and estimate its pure-dephasing coherence time, finding agreement with previous experimental results. By developing an accurate single-mode theory and benchmarking the results with circuits spanning a large Hilbert space, the algorithm provides a useful tool for scaling up superconducting quantum technologies.
NPJ QUANTUM INFORMATION
(2021)
Review
Physics, Multidisciplinary
Alexandre Blais, Arne L. Grimsmo, S. M. Girvin, Andreas Wallraffe
Summary: Circuit quantum electrodynamics (QED) is an independent and thriving field of research that allows unprecedented detailed study and control of light-matter interaction at the quantum level. It has become essential in current approaches to gate-based digital quantum information processing with superconducting circuits, and also provides a framework for the study of hybrid quantum systems. The coherent coupling of superconducting qubits to microwave photons, dispersive qubit readout, and different regimes of light-matter interaction are key aspects of circuit QED.
REVIEWS OF MODERN PHYSICS
(2021)
Article
Physics, Applied
Arne L. Grimsmo, Baptiste Royer, John Mark Kreikebaum, Yufeng Ye, Kevin O'Brien, Irfan Siddiqi, Alexandre Blais
Summary: The paper introduces a single-photon detector design operating in the microwave domain, based on weakly nonlinear metamaterial for high-accuracy single-photon detection and large detection bandwidth. This design offers promising possibilities for the development of quantum information processing, quantum optics, and metrology.
PHYSICAL REVIEW APPLIED
(2021)
Article
Education, Scientific Disciplines
Abraham Asfaw, Alexandre Blais, Kenneth R. Brown, Jonathan Candelaria, Christopher Cantwell, Lincoln D. Carr, Joshua Combes, Dripto M. Debroy, John M. Donohue, Sophia E. Economou, Emily Edwards, Michael F. J. Fox, Steven M. Girvin, Alan Ho, Hilary M. Hurst, Zubin Jacob, Blake R. Johnson, Ezekiel Johnston-Halperin, Robert Joynt, Eliot Kapit, Judith Klein-Seetharaman, Martin Laforest, H. J. Lewandowski, Theresa W. Lynn, Corey Rae H. McRae, Celia Merzbacher, Spyridon Michalakis, Prineha Narang, William D. Oliver, Jens Palsberg, David P. Pappas, Michael G. Raymer, David J. Reilly, Mark Saffman, Thomas A. Searles, Jeffrey H. Shapiro, Chandralekha Singh
Summary: The paper provides a roadmap for constructing a quantum engineering education program to meet the workforce needs of the United States and international community. Through a workshop and drawing on best practices, the researchers make specific findings and recommendations, including the design of a first quantum engineering course accessible to all STEM students and the education and training methods for producing quantum-proficient engineers.
IEEE TRANSACTIONS ON EDUCATION
(2022)
Article
Physics, Applied
Catherine Leroux, Agustin Di Paolo, Alexandre Blais
Summary: The study introduces a superconducting coupler that suppresses all two-qubit interactions with an exponentially large on:off ratio without the need for fine tuning, effectively reducing errors in multiqubit superconducting quantum processors.
PHYSICAL REVIEW APPLIED
(2021)
Article
Multidisciplinary Sciences
Sebastian Krinner, Nathan Lacroix, Ants Remm, Agustin Di Paolo, Elie Genois, Catherine Leroux, Christoph Hellings, Stefania Lazar, Francois Swiadek, Johannes Herrmann, Graham J. Norris, Christian Kraglund Andersen, Markus Mueller, Alexandre Blais, Christopher Eichler, Andreas Wallraff
Summary: This study demonstrates quantum error correction using the surface code and implements protection of logical qubits using 17 physical qubits in a superconducting circuit. By repeatedly executing error-correction cycles, measuring and decoding error syndromes, and applying post-processing corrections, repeated, fast, and high-performance quantum error correction is achieved.
Article
Physics, Applied
Ross Shillito, Alexandru Petrescu, Joachim Cohen, Jackson Beall, Markus Hauru, Martin Ganahl, Adam G. M. Lewis, Guifre Vidal, Alexandre Blais
Summary: This study explores the dynamics of a driven transmon-resonator system under strong and nearly resonant measurement drives, finding clear signatures of transmon ionization. The research interprets this ionization as resulting from resonances occurring at specific resonator-photon populations, which can occur at low resonator-photon population and may explain the experimentally observed degradation in measurement fidelity.
PHYSICAL REVIEW APPLIED
(2022)
Article
Physics, Applied
Alexandru Petrescu, Camille Le Calonnec, Catherine Leroux, Agustin Di, Pranav Mundada, Sara Sussman, Andrei Vrajitoarea, Andrew A. Houck, Alexandre Blais
Summary: The ability to perform fast, high-fidelity entangling gates is crucial for a viable quantum processor. In this study, we demonstrate an efficient method for extracting gate parameters by directly solving a Floquet eigenproblem using exact numerics and perturbative analytical techniques. Our approach allows us to identify optimal operation regimes for different types of gates including iSWAP, controlled-Z, and CNOT.
PHYSICAL REVIEW APPLIED
(2023)
Article
Quantum Science & Technology
Joachim Cohen, Alexandru Petrescu, Ross Shillito, Alexandre Blais
Summary: In this study, we demonstrate that even off-resonant drives, commonly used in experiments, can significantly affect the structure of the transmon spectrum, leading to chaos. Accounting for the full nonlinear dynamics of the transmon, we find that these chaotic states strongly impact the lifetime of the transmon's computational states. Additionally, chaos-assisted quantum phase slips are observed to greatly enhance band dispersions.
Article
Quantum Science & Technology
Marie Lu, Jean -Loup Ville, Joachim Cohen, Alexandru Petrescu, Sydney Schreppler, Larry Chen, Christian Junger, Chiara Pelletti, Alexei Marchenkov, Archan Banerjee, William P. Livingston, John Mark Kreikebaum, David I. Santiago, Alexandre Blais, Irfan Siddiqi
Summary: Exploring highly connected networks of qubits is crucial for implementing various quantum algorithms and simulations. In this study, we demonstrate the first implementation of a Molmer-Sorensen-like interaction in circuit quantum electrodynamics using a shared photonic mode and Rabi-driven qubits. Our results show high fidelity two-qubit and three-qubit gates, as well as a four-qubit gate with limited fidelity due to shared resonator losses and the spread of qubit-resonator couplings. Addressing these limitations is necessary for achieving high-fidelity operations.
Article
Quantum Science & Technology
Elie Genois, Jonathan A. Gross, Agustin Di Paolo, Noah J. Stevenson, Gerwin Koolstra, Akel Hashim, Irfan Siddiqi, Alexandre Blais
Summary: By incorporating features of quantum mechanics, the ML approach in this study outperformed generic models in characterizing the dynamics of a quantum device and learning device parameters. Leveraging domain knowledge improved the accuracy and efficiency of the characterization task significantly.
Article
Physics, Multidisciplinary
Ross Shillito, Jonathan A. Gross, Agustin Di Paolo, Elie Genois, Alexandre Blais
Summary: This paper introduces a semianalytic method called Dysolve, based on the Dyson expansion, for faster time evolution of driven quantum systems. The method efficiently captures the effects of highly oscillatory terms in the system Hamiltonian, significantly reducing simulation run time and providing exact derivatives of the time-evolution operator with respect to drive amplitudes.
PHYSICAL REVIEW RESEARCH
(2021)
Article
Quantum Science & Technology
Andras Gyenis, Agustin Di Paolo, Jens Koch, Alexandre Blais, Andrew A. Houck, David Schuster
Summary: Artificial atoms realized by superconducting circuits offer unique opportunities to store and process quantum information with high fidelity. Implementations of circuits that harness intrinsic noise protection have been rapidly developed in recent years, constituting a new class of qubits.
Article
Quantum Science & Technology
Andras Gyenis, Pranav S. Mundada, Agustin Di Paolo, Thomas M. Hazard, Xinyuan You, David Schuster, Jens Koch, Alexandre Blais, Andrew A. Houck
Summary: The study demonstrates the realization of a fully protected superconducting qubit using the 0-π circuit structure, where the logical states have disjoint support and are exponentially protected against relaxation and dephasing. Energy level structure of the system was revealed through multitone spectroscopy measurements, and coherent population transfer and logical operations were achieved using a Raman-type protocol. The measurements showed relaxation and dephasing times, indicating a significant step towards quantum computing with inherently protected superconducting qubits.
Article
Physics, Multidisciplinary
Alexandre Choquette, Agustin Di Paolo, Panagiotis Kl Barkoutsos, David Senechal, Ivano Tavernelli, Alexandre Blais
Summary: This article introduces a new quantum algorithm ansatz design method that improves the convergence rate for some problems by incorporating symmetry-breaking unitary operations. Experimental results show that this method performs well in the ground state search tasks for the Fermi-Hubbard model and the water molecule, presenting a new approach for physics and chemistry problems.
PHYSICAL REVIEW RESEARCH
(2021)
