Observation of Anti-
<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline" overflow="scroll"><mml:mrow><mml:mi mathvariant="script">P</mml:mi><mml:mi mathvariant="script">T</mml:mi></mml:mrow></mml:math>
-Symmetry Phase Transition in the Magnon-Cavity-Magnon Coupled System

Jie, Zhao; Liu, Yulong; Wu, Longhao; Duan, Chang‐Kui; Liu, Yuxi; Du, Jiangfeng

doi:10.1103/physrevapplied.13.014053

Cited by 100 publications

(54 citation statements)

References 42 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Interestingly, anti-PTsymmetry [188][189][190][191] -the counterpart of PT symmetry-has also been demonstrated in hybrid magnonics. 192,193 In these demonstrations, purely imaginary coupling between two interacting modes can be obtained through dissipative coupling, resulting in properties that are conjugate to PT-symmetric systems. In anti-PT-symmetric hybrid magnonic systems, EPs are also observed at the transition from the anti-PT-symmetric phase to the anti-PT-symmetry-broken phase.…”

Section: E Non-hermitian Physics and Exceptional Pointsmentioning

confidence: 99%

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

Awschalom

et al. 2021

IEEE Trans. Quantum Eng.

105

View full text Add to dashboard Cite

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.

show abstract

Section: E Non-hermitian Physics and Exceptional Pointsmentioning

confidence: 99%

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

Awschalom

et al. 2021

IEEE Trans. Quantum Eng.

105

View full text Add to dashboard Cite

show abstract

“…While the traveling wave is the key ingredient of the open cavity magnonic systems that leads to the observation of LA, it is not the only way for inducing dissipative coupling. A few theories have proposed an alternative mechanism for realizing dissipative couplings by utilizing an auxiliary cavity mode 58,59,67 , which is very different from the mechanism of the traveling wave. This auxiliary mode, with a large intrinsic damping rate, can be seen as a common reservoir for inducing indirect coupling between two principle modes.…”

Section: Dissipative Coupling Mediated By a Damped Auxiliary Cavitmentioning

confidence: 99%

Dissipative couplings in cavity magnonics

Wang

2020

Journal of Applied Physics

109

View full text Add to dashboard Cite

Cavity Magnonics is an emerging field that studies the strong coupling between cavity photons and collective spin excitations such as magnons. This rapidly developing field connects some of the most exciting branches of modern physics, such as quantum information and quantum optics, with one of the oldest science on the earth, the magnetism. The past few years have seen a steady stream of exciting experiments that demonstrate novel magnon-based transducers and memories. Most of such cavity magnonic devices rely on coherent coupling that stems from direct dipole-dipole interaction. Recently, a distinct dissipative magnon-photon coupling was discovered. In contrast to coherent coupling that leads to level repulsion between hybridized modes, dissipative coupling results in level attraction. It opens an avenue for engineering and harnessing losses in hybrid systems. This article gives a brief review of this new frontier. Experimental observations of level attraction are reviewed. Different microscopic mechanisms are compared. Based on such experimental and theoretical reviews, we present an outlook for developing open cavity systems by engineering and harnessing dissipative couplings.

show abstract

“…Equation (21) ensures that the eigenvalues of H eff are either purely real or occur in complex conjugate pairs, and thus endows H eff with some antilinear symmetry. With this constraint, the eigenvalues ± of the effective, non-Hermitian Hamiltonian, Eq.…”

Section: Effective Hamiltonian and Emergent Pt Symmetrymentioning

confidence: 99%

“…In the previous section, we have seen the dynamics of the cavities, including the effects of quantum fluctuations, when the gain from the DQD unit is balanced by the losses of the cavities, Eq. (21). In this section, we look at dissipative cavities, where the combined loss from the two cavities exceeds the DQD gain in the first cavity, i.e.,…”

Section: Signatures Of Exceptional Points For Dissipative Cavitiesmentioning

confidence: 99%

“…The subject of non-Hermitian, PT -symmetric Hamiltonians and their exceptional point degeneracies has evolved into a rich and active field. In the classical domain, effective non-Hermitian systems have been theoretically and experimentally studied in waveguides [6,7], fiber loops [8], resonators [9,10], electrical circuits [11][12][13][14][15], mechanical oscillators [16,17], viscous fluids [18], magnonics [19][20][21], acoustics [22][23][24], optomechanics [25,26], and optical lattices [27]. Occurrence of exceptional points has been used in device applications like sensing [23,24,[28][29][30], single-mode lasing [31], unidirectional invisibility [32], loss-induced transparency [33], loss-induced lasing [34], etc.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Emergent PT symmetry in a double-quantum-dot circuit QED setup

Purkayastha

Kulkarni

Joglekar

2020

Phys. Rev. Research

View full text Add to dashboard Cite

Open classical and quantum systems with effective parity-time (PT) symmetry, over the past five years, have shown tremendous promise for advances in lasers, sensing, and nonreciprocal devices. And yet, how such effective PT-symmetric non-Hermitian models emerge out of Hermitian quantum mechanics is not well understood. Here, starting from a fully Hermitian microscopic Hamiltonian description, we show that a non-Hermitian Hamiltonian emerges naturally in a double-quantum-dot (DQD) circuit-QED setup, which can be controllably tuned to the PT-symmetric point. This effective Hamiltonian governs the dynamics of two coupled circuit-QED cavities with a voltage-biased DQD in one of them. Our analysis also reveals the effect of quantum fluctuations on the PT-symmetric system. The PT transition is, then, observed both in the dynamics of cavity observables as well as via an input-output experiment. As a simple application of the PT transition in this setup, we show that loss-induced enhancement of amplification and lasing can be observed in the coupled cavities. By comparing our results with two conventional local Lindblad equations, we demonstrate the utility and limitations of the latter. Our results pave the way for an on-chip realization of a potentially scalable non-Hermitian system with a gain medium in the quantum regime, as well as its potential applications for quantum technology.

show abstract

Observation of Anti- PT -Symmetry Phase Transition in the Magnon-Cavity-Magnon Coupled System

Cited by 100 publications

References 42 publications

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

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

Dissipative couplings in cavity magnonics

Emergent PT symmetry in a double-quantum-dot circuit QED setup

Contact Info

Product

Resources

About