Martin Weides

University of Glasgow

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Co-Authors

A. V. Ustinov

National Research University Higher School of Economics

Hannes Rotzinger

Karlsruhe Institute of Technology

Andre Schneider

Karlsruhe Institute of Technology

John M. Martinis

Tektronix (United States)

D. Sank

Google (United States)

A. D. O’Connell

University of California, Santa Barbara

Radoslaw C. Bialczak

University of California, Santa Barbara

J. Wenner

University of California, Santa Barbara

M. Neeley

Google (United States)

Erik Lucero

Google (United States)

Cooperative Institutions

Karlsruhe Institute of Technology

University of Glasgow

Forschungszentrum Jülich

National Institute of Standards and Technology

National University of Science and Technology

University of California, Santa Barbara

Centre National de la Recherche Scientifique

Delft University of Technology

Russian Quantum Center

Jülich Aachen Research Alliance

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Observation of Room Temperature Exchange Cavity Magnon‐Polaritons in Metallic Thin Films

Advanced Quantum Technologies (2024)

Mawgan A. Smith Adam L. Lafferty Alban Joseph Matthew McMaster Jade N. Scott

Abstract Cavity magnonics has become an intriguing field due to its potential to enable next‐generation technologies centered around controlling information exchange in hybrid resonant systems. Investigating the tunability of magnon‐photon coupling is key to advancing the field. Here, the observation of coupling between the first order magnon mode in a metallic thin film with a cavity photon mode is reported. An electromagnetic perturbation theory that takes account of perpendicular standing spin waves and their respective dissipation is utilized to estimate the coupling strength. The metallic thin film exhibits notably lower dissipation for the higher‐order magnon mode, which is not observed in a thin film magnetic insulator. As such, and given that metallic Kittel magnons typically exhibit lower coherence times than their insulator counterparts, the excitation and coupling to specific higher order modes could lengthen these times compared to previous observations, which may be useful for future integration into quantum devices.

Magnon

10.1002/qute.202300420

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Advanced Superconducting Circuits and Devices

digital Encyclopedia of Applied Physics (2016)

Martin Weides Hannes Rotzinger

The article contains sections titled: Introduction Field‐Effect Devices Quantum Information Circuits Metamaterials at Microwave Frequencies Quantum Phase Slip Novel Quantum Circuits Quantum‐Limited Measurements: Microwave Parametric Amplifiers

10.1002/3527600434.eap800

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Multiphoton dressing of an anharmonic superconducting many-level quantum circuit

Physical Review B (2015)

Jochen Braumüller Joel Cramer Steffen Schlör Hannes Rotzinger Lucas Radtke

We report on the investigation of a superconducting anharmonic multilevel circuit that is coupled to a harmonic readout resonator. We observe multiphoton transitions via virtual energy levels of our system up to the fifth excited state. The back-action of these higher-order excitations on our readout device is analyzed quantitatively and demonstrated to be in accordance with theoretical expectation. By applying a strong microwave drive we achieve multiphoton dressing within our anharmonic circuit which is dynamically coupled by a weak probe tone. The emerging higher-order Rabi sidebands and associated Autler-Townes splittings involving up to five levels of the investigated anharmonic circuit are observed. Experimental results are in good agreement with master-equation simulations.

10.1103/physrevb.91.054523

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Citations (52)

Efficient and robust analysis of complex scattering data under noise in microwave resonators

Review of Scientific Instruments (2015)

Sebastian Probst Fangfang Song Pavel Bushev A. V. Ustinov Martin Weides

Superconducting microwave resonators are reliable circuits widely used for detection and as test devices for material research. A reliable determination of their external and internal quality factors is crucial for many modern applications, which either require fast measurements or operate in the single photon regime with small signal to noise ratios. Here, we use the circle fit technique with diameter correction and provide a step by step guide for implementing an algorithm for robust fitting and calibration of complex resonator scattering data in the presence of noise. The speedup and robustness of the analysis are achieved by employing an algebraic rather than an iterative fit technique for the resonance circle.

Robustness

Speedup

10.1063/1.4907935

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Citations (98)

Tailoring coupling in artificial superconducting quasi-spins

Verhandlungen der Deutschen Physikalischen Gesellschaft (2017)

Alexander Stehli Jochen Braumueller Andre Schneider Hannes Rotzinger Martin Weides

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Reduced phase error through optimized control of a superconducting qubit

Physical Review A (2010)

Erik Lucero J. Kelly Radoslaw C. Bialczak M. Lenander M. Mariantoni

Minimizing phase and other errors in experimental quantum gates allows higher fidelity quantum processing. To quantify and correct for phase errors, in particular, we have developed an experimental metrology---amplified phase error (APE) pulses---that amplifies and helps identify phase errors in general multilevel qubit architectures. In order to correct for both phase and amplitude errors specific to virtual transitions and leakage outside of the qubit manifold, we implement ``half derivative,'' an experimental simplification of derivative reduction by adiabatic gate (DRAG) control theory. The phase errors are lowered by about a factor of five using this method to $~{1.6}^{\ifmmode^\circ\else\textdegree\fi{}}$ per gate, and can be tuned to zero. Leakage outside the qubit manifold, to the qubit $|2\ensuremath{\rangle}$ state, is also reduced to $~{10}^{\ensuremath{-}4}$ for $20%$ faster gates.

Leakage (economics)

10.1103/physreva.82.042339

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Citations (122)

Steering between Level Repulsion and Attraction: Beyond Single-Tone Driven Cavity Magnon-Polaritons

arXiv (Cornell University) (2019)

Isabella Boventer Mathias Kläui Rair Macêdo Martin Weides

Cavity-magnon polaritons (CMPs) are the associated quasiparticles of a hybridization between cavity photons and magnons in a magnetic sample placed in a microwave resonator. In the strong coupling regime, where the macroscopic coupling strength exceeds the individual dissipation, there is a coherent exchange of information. This renders CMPs as promising candidates for future applications such as in information processing. Recent progress on the study of the CMP allows now not only to obtain CMPs, but also to tune the coupling strength such as enhancing or suppressing the information exchange. Here, we go beyond standard single-tone driven CMPs and employ a two-tone driven CMP. We control the coupling strength by the relative phase $\phi$ and amplitude field ratio $\delta_0$ between both tones. Specifically, we derive a new expression from Input-Output theory for the study of the two-tone driven CMP and discuss the implications on the coupling strength. Furthermore, we examine intermediate cases where the coupling strength is tuned between its maximal and minimal value and, in particular, the high $\delta_0$ regime.

Magnon

Coupling strength

Tone (literature)

Microwave cavity

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Citations (2)

Flux-noise spectroscopy on a superconducting transmon qubit

Tim Wolz Andre Schneider Jochen Braumüller A. V. Ustinov Martin Weides

Transmon

Flux qubit

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Quantum Computation: Principles and Solid‐State Concepts

Nanotechnology (2010)

Martin Weides E. Goldobin

Abstract In this chapter we review the basics of quantum computation and discuss promising physical systems for implementation of a qubit. The advantage of quantum computation over classical computation is shown by presenting the quantum algorithms for searching databases and factorizing numbers. In addition, quantum bits are ideal candidates for secure communication. The operation scheme and error correction of quantum computation are reviewed. First experimental realization of quantum computation by nuclear magnetic resonance is outlined. Several types of scalable solid‐state qubits based on semiconductors and superconducting Josephson junctions (charge, flux and fractional flux qubits) are presented.

Realization (probability)

Flux qubit

10.1002/9783527628155.nanotech048

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PROGRESS IN SUPERCONDUCTING QUBITS

Journal Club for Condensed Matter Physics (2010)

Leo DiCarlo Laura K. Reed Baojun Sun James D. Johnson J. H. Chow

The tremendous progress on qubits and quantum logic circuits made recently with superconducting circuits, as indicated by the four papers above, arises largely from three simple facts:

10.36471/jccm_june_2010_02

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