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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Nonreciprocity and Unidirectional Invisibility in Cavity Magnonics.
Yi-Pu Wang,J. W. Rao,Y. Yang,Peng-Chao Xu,Peng-Chao Xu,Yongsheng Gui,B. M. Yao,J. Q. You,Can-Ming Hu +8 more
TL;DR: The cooperative effect of coherent and dissipative magnon-photon couplings in an open cavity magnonic system is revealed, which leads to nonreciprocity with a considerably large isolation ratio and flexible controllability.
Journal ArticleDOI
Coherent coupling of a single spin to microwave cavity photons
TL;DR: In this article, a nanoscale spin valve was used to coherently hybridize the individual spin and charge states of a double quantum dot while preserving spin coherence, which allowed the single-spin-photon coupling up to the megahertz range at the single spin level.
Journal ArticleDOI
Observation of the exceptional point in cavity magnon-polaritons
TL;DR: By tuning the magnon–photon coupling strength, an exceptional point and spontaneous symmetry breaking in a cavity magnon-polariton system are observed and the polaritonic coherent perfect absorption is observed and demonstrated at the exceptional point.
Journal ArticleDOI
Cavity quantum electrodynamics with ferromagnetic magnons in a small yttrium-iron-garnet sphere
TL;DR: Li et al. as discussed by the authors reported an experimental study of cavity quantum electrodynamics with ferromagnetic magnons in a small yttrium-iron-garnet (YIG) sphere at both cryogenic and room temperatures.
Journal ArticleDOI
Entanglement-based single-shot detection of a single magnon with a superconducting qubit.
Dany Lachance-Quirion,Samuel Wolski,Yutaka Tabuchi,Shingo Kono,Koji Usami,Yasunobu Nakamura,Yasunobu Nakamura +6 more
TL;DR: Using a superconducting qubit as a quantum sensor, a single magnon is detected in a millimeter-sized ferrimagnetic crystal with a quantum efficiency of up to 0.71, establishing the single-photon detector counterpart for magnonics.
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.