Synthetic Anti-PT Symmetry in a Single Microcavity

Zhang, Fangxing; Feng, Yaming; Chen, Xianfeng; Li, Ge; Wan, Wenjie

doi:10.1103/physrevlett.124.053901

Cited by 129 publications

(90 citation statements)

References 48 publications

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“…The aforementioned EP observations treat the hybrid magnonic systems as effective parity-time (PT) symmetric systems, with EPs representing the onset of the PT symmetry breaking. 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.…”

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.

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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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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.

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“…The first local Lindblad equation that we consider can be microscopically derived for our setup (see Appendix D) using the Born-Markov approximation, the conditions on energy scales in Eqs. (10), (11), (12), along with the following approximation,b…”

Section: Comparison With Local Lindblad Resultsmentioning

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%

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

Purkayastha

Kulkarni

Joglekar

2020

Phys. Rev. Research

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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.

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“…With the intrinsic coupling relation in BIST mechanism, recently, this transparency in a synthetic anti-PT-symmetric microcavity was experimentally illustrated. [142] Figure 8. a) Schematic diagram of BSIT experiment.…”

Section: Brillouin Scattering Induced Transparencymentioning

confidence: 99%

Induced Transparency with Optical Cavities

Qin

Ding

Yin

2020

Advanced Photonics Research

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Induced transparency, an interference effect due to mode coupling, has attracted significant research interest. The first discovered and most striking type of induced transparency plays electromagnetically induced transparency (EIT) in atomic systems. Optical cavities serve as a more ideal and feasible platform for realizing the effects of induced transparency, which leads to considerable demonstrations in theory and experiments. This review provides a run‐through of research findings on different types of induced transparency phenomenon, including, inter alia, EIT, optomechanically induced transparency, plasmon‐induced transparency, Brillouin scattering induced transparency, optically induced transparency, photothermally induced transparency, and dipole‐induced transparency. Their mechanisms, developments, techniques, and applications are discussed in detail. Most importantly, the emerging area of induced transparency at exceptional points is analyzed for its great promise. The last section presents a brief summary and perspective of induced transparency with optical cavities.

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Synthetic Anti-PT Symmetry in a Single Microcavity

Cited by 129 publications

References 48 publications

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

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

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

Induced Transparency with Optical Cavities

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