Microwave magnon damping in YIG films at millikelvin temperatures

Kosen, Sandoko; Loo, Arjan F. van; Bozhko, Dmytro A.; Mihalceanu, Laura; Karenowska, A. D.

doi:10.1063/1.5115266

Cited by 64 publications

(41 citation statements)

References 51 publications

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“…Note added in proof -Recently, a manuscript studying losses in thin film YIG that independently observed comparable results and reached similar conclusions was published by Kosen et al [51].…”

supporting

confidence: 59%

Magnons at low excitations: Observation of incoherent coupling to a bath of two-level systems

Pfirrmann

Boventer

Schneider

et al. 2019

Phys. Rev. Research

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Collective magnetic excitation modes, magnons, can be coherently coupled to microwave photons in the single excitation limit. This allows for access to quantum properties of magnons and opens up a range of applications in quantum information processing, with the intrinsic magnon linewidth representing the coherence time of a quantum resonator. Our measurement system consists of a yttrium iron garnet sphere and a three-dimensional microwave cavity at temperatures and excitation powers typical for superconducting quantum circuit experiments. We perform spectroscopic measurements to determine the limiting factor of magnon coherence at these experimental conditions. Using the input-output formalism, we extract the magnon linewidth κm. We attribute the limitations of the coherence time at lowest temperatures and excitation powers to incoherent losses into a bath of near-resonance two-level systems (TLSs), a generic loss mechanism known from superconducting circuits under these experimental conditions. We find that the TLSs saturate when increasing the excitation power from quantum excitation to multiphoton excitation and their contribution to the linewidth vanishes. At higher temperatures, the TLSs saturate thermally and the magnon linewidth decreases as well.

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supporting

confidence: 59%

Magnons at low excitations: Observation of incoherent coupling to a bath of two-level systems

Pfirrmann

Boventer

Schneider

et al. 2019

Phys. Rev. Research

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“…While Py is a classical ferromagnet with convenient deposition and fabrication, its relatively large Gilbert damping is not optimal for long-coherence magnon-photon interaction. For low-damping YIG thin films, one issue is that they are typically grown on gadolinium gallium garnet (GGG) substrates, which possess a complex magnetic behavior at cryogenic temperature 30,31 and will increase the loss of excitations if the superconducting circuits are fabricated on GGG substrate. To address this issue, freestanding YIG thin films 32,33 or YIG films grown on Si substrate 34 may provide a solution.…”

Section: A Magnon-photon Coupling and Superconducting Resonatorsmentioning

confidence: 99%

Quantum Engineering With Hybrid Magnonic Systems and Materials (Invited Paper)

Awschalom

et al. 2021

IEEE Trans. Quantum Eng.

105

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Quantum technology has made tremendous strides over the past two decades with remarkable advances in materials engineering, circuit design and dynamic operation. In particular, the integration of different quantum modules has benefited from hybrid quantum systems, which provide an important pathway for harnessing the different natural advantages of complementary quantum systems and for engineering new functionalities. This review focuses on the current frontiers with respect to utilizing magnetic excitatons or magnons for novel quantum functionality. Magnons are the fundamental excitations of magnetically ordered solid-state materials and provide great tunability and flexibility for interacting with various quantum modules for integration in diverse quantum systems. The concomitant rich variety of physics and material selections enable exploration of novel quantum phenomena in materials science and engineering. In addition, the relative ease of generating strong coupling and forming hybrid dynamic systems with other excitations makes hybrid magnonics a unique platform for quantum engineering. We start our discussion with circuit-based hybrid magnonic systems, which are coupled with microwave photons and acoustic phonons. Subsequently, we are focusing on the recent progress of magnon-magnon coupling within confined magnetic systems. Next we highlight new opportunities for understanding the interactions between magnons and nitrogen-vacancy centers for quantum sensing and implementing quantum interconnects. Lastly, we focus on the spin excitations and magnon spectra of novel quantum materials investigated with advanced optical characterization.

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“…Since the recent emergence of this hybrid particle, three different models, in particular, have helped to unravel the physics of CMPs over the last years: first, the picture of two coupled oscillators, which is the most intuitive one; the underlying physics, however, is only revealed from an electromagnetic viewpoint, which is the second model and shows a phase correlation between cavity and magnon excitation [9]; and finally, the quantum description of the CMP, which has, for instance, given the theoretical framework for a coupling of magnons to a superconducting qubit [10,11]. Many spectroscopic experiments have led to new insights about loss channels [3,12,13], their temperature dependence [14][15][16], and to the observation of level attraction [17][18][19]. These spectroscopic measurements, however, are performed under continuous driving, and while they have yielded great physical insight into these hybrid systems, flexible and universal information processing requires the manipulation of such physical * tim.wolz@kit.edu † martin.weides@glasgow.ac.uk states on demand and on nanosecond timescales.…”

Section: Introductionmentioning

confidence: 99%

Introducing coherent time control to cavity magnon-polariton modes

et al. 2020

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By connecting light to magnetism, cavity-magnon-polaritons (CMPs) can build links from quantum computation to spintronics. As a consequence, CMP-based information processing devices have thrived over the last five years, but almost exclusively been investigated with single-tone spectroscopy. However, universal computing applications will require a dynamic control of the CMP on demand and within nanoseconds. In this work, we perform fast manipulations of the different CMP modes with independent but coherent pulses to the cavity and magnon system. We change the state of the CMP from the energy exchanging beat mode to its normal modes and further demonstrate two fundamental examples of coherent manipulation: First, a dynamic control over the appearance of magnon-Rabi oscillations, i.e., energy exchange, and second, a complete energy extraction by applying an anti-phase drive to the magnon. Our results show a promising approach to control different building blocks for a quantum internet and pave the way for further magnon-based quantum computing research.

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Microwave magnon damping in YIG films at millikelvin temperatures

Cited by 64 publications

References 51 publications

Magnons at low excitations: Observation of incoherent coupling to a bath of two-level systems

Magnons at low excitations: Observation of incoherent coupling to a bath of two-level systems

Quantum Engineering With Hybrid Magnonic Systems and Materials (Invited Paper)

Introducing coherent time control to cavity magnon-polariton modes

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