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
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Cavity magnomechanical storage and retrieval of quantum states
TL;DR: In this article, the authors show how a quantum state in a microwave cavity mode can be transferred to and stored in a phononic mode via an intermediate magnon mode in a magnomechanical system, where the microwave and magnon modes are coupled via a magnetic-dipole interaction and the magnon and phonon modes in the yttrium iron garnet (YIG) sphere are coupled by magnetostrictive forces.
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Single-quadrature quantum magnetometry in cavity electromagnonics
TL;DR: In this article, an ultrasensitive magnetometer in the cavity quantum electromagnonics is proposed, where the intracavity microwave mode is coupled to a magnonic mode via magnetic dipole interaction.
Magnetization dynamics in coupled magnetic systems
TL;DR: In this article, the authors investigated the magnetization dynamics in coupled magnetic systems using broadband ferromagnetic resonance and Brillouin light scattering techniques, and observed and characterized the coupling and relaxation mechanisms between magnons and electrons in semiconductors.
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Magnon-photon coupling in antiferromagnets
Huaiyang Yuan,Xiangrong Wang +1 more
TL;DR: In this paper, it was shown that in the absence of an external field, one of the two degenerated spin wave bands couples with photons while the other does not, and the photon mode anticrosses with the coupled spin waves when their frequencies are close to each other.
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Magnon-mediated nonreciprocal microwave transmission based on quantum interference.
TL;DR: This work derives necessary requirements to create nonreciprocity in a system where a magnon mode and two microwave modes are coupled to each other, highlighting the adjustability of a static magnetic field controlledNonreciprocal transmission based on quantum interference between different transmission paths.
References
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Coherence in Spontaneous Radiation Processes
TL;DR: In this article, the authors considered a radiating gas as a single quantum-mechanical system, and the energy levels corresponding to certain correlations between individual molecules were described, where spontaneous emission of radiation in a transition between two such levels leads to the emission of coherent radiation.
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Strong coupling of a single photon to a superconducting qubit using circuit quantum electrodynamics
Andreas Wallraff,David Schuster,Alexandre Blais,Luigi Frunzio,Ren-Shou Huang,Ren-Shou Huang,Johannes Majer,Sushant Kumar,Steven Girvin,Robert Schoelkopf +9 more
TL;DR: It is shown that the strong coupling regime can be attained in a solid-state system, and the concept of circuit quantum electrodynamics opens many new possibilities for studying the strong interaction of light and matter.
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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.