High cooperativity in coupled microwave resonator ferrimagnetic insulator hybrids.
Hans Huebl,Christoph W. Zollitsch,Johannes Lotze,Fredrik Hocke,Moritz Greifenstein,Achim Marx,Rudolf Gross,Sebastian T. B. Goennenwein +7 more
TLDR
The observation of strong coupling between the exchange-coupled spins in a gallium-doped yttrium iron garnet and a superconducting coplanar microwave resonator made from Nb demonstrates that exchange-Coupled systems are suitable for cavity quantum electrodynamics experiments, while allowing high integration densities due to their spin densities of the order of one Bohr magneton per atom.Abstract:
We report the observation of strong coupling between the exchange-coupled spins in a gallium-doped yttrium iron garnet and a superconducting coplanar microwave resonator made from Nb. The measured coupling rate of 450 MHz is proportional to the square root of the number of exchange-coupled spins and well exceeds the loss rate of 50 MHz of the spin system. This demonstrates that exchange-coupled systems are suitable for cavity quantum electrodynamics experiments, while allowing high integration densities due to their spin densities of the order of one Bohr magneton per atom. Our results furthermore show, that experiments with multiple exchange-coupled spin systems interacting via a single resonator are within reach.read more
Citations
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Hybrid states of a cavity-photon–vortex coupled system in a superconductive cavity
TL;DR: In this article , a cavity-photon-vortex coupling in a superconductive cavity was proposed to construct a new hybrid quantum system, and the corresponding hybrid states therein, including the exceptional lines (ELs) in the parameter space.
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Significant suppression of two-magnon scattering in ultrathin Co by controlling the surface magnetic anisotropy at the Co/nonmagnet interfaces
Shugo Yoshii,Keisuke Kato,Ei Shigematsu,Ryo Ohshima,Yuichiro Ando,Koji Usami,Masashi Shiraishi +6 more
TL;DR: In this article , the authors verify the significantly weak magnon damping realized by varying the seeding layer species used, which is attributed to suppression of the surface magnetic anisotropy (SMA) at the interface between Co and Ti.
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Interactive entanglement in hybrid opto-magno-mechanics system
TL;DR: In this article , the authors present a cavity opto-magno-mechanical hybrid system to generate entanglement among multiple quantum carriers, such as magnons, mechanical resonators, and cavity photons in both the optical and microwave domains.
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Enhanced the Bi-(Tri-)partite entanglement between three magnons in a cavity magnomechanics system
TL;DR: In this article , the authors proposed a scheme to generate steady-state bipartite and tripartite entanglement in the cavity magnomechanical system, which consists of a microwave (MW) cavity field, three magnons, and a phonon mode.
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Measuring the Magnon-Photon Coupling in Shaped Ferromagnets: Tuning of the Resonance Frequency
Sergio Martínez-Losa del Rincón,Ignacio Gimeno,J. Perez-Bailon,V. Rollano,Fernando Luis,David Zueco,M. J. Martínez-Pérez +6 more
TL;DR: In this article , the fundamental frequency of the magnonic resonator was determined by using focused ion beam patterning, and the aspect ratio of different Permalloy samples reaching operation frequencies above 10 GHz while working at low external magnetic field.
References
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Strong coupling of a single photon to a superconducting qubit using circuit quantum electrodynamics
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Introduction to quantum noise, measurement, and amplification
TL;DR: In this paper, a pedagogical introduction to the physics of quantum noise and its connections to quantum measurement and quantum amplification is given, and the basics of weak continuous measurements are described.
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Circuit quantum electrodynamics in the ultrastrong-coupling regime
T. Niemczyk,Frank Deppe,Hans Huebl,Edwin P. Menzel,Fredrik Hocke,M. J. Schwarz,Juan José García-Ripoll,David Zueco,Thomas Hümmer,Enrique Solano,Enrique Solano,Achim Marx,Rudolf Gross +12 more
TL;DR: In this article, it was shown that the Jaynes-cummings model breaks down in the regime of ultrastrong coupling between light and matter, and that higher-order processes are possible.
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Demonstration of two-qubit algorithms with a superconducting quantum processor
Leonardo DiCarlo,Jerry M. Chow,Jay M. Gambetta,Lev S. Bishop,Blake R. Johnson,David Schuster,Johannes Majer,Alexandre Blais,Luigi Frunzio,Steven Girvin,Robert Schoelkopf +10 more
TL;DR: A two-qubit superconducting processor and the implementation of the Grover search and Deutsch–Jozsa quantum algorithms are demonstrated and the generation of highly entangled states with concurrence up to 94 per cent is allowed.