Loss-induced nonreciprocity

Huang, Xinyao; Lu, Cuicui; Liang, Chao Wen; Tao, Honggeng

doi:10.1038/s41377-021-00464-2

Cited by 60 publications

(25 citation statements)

References 49 publications

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“…These results, shedding light on the marriage of non-Hermitian physics and quantum optics at the single-photon levels, open up the way to reverse the effect of loss for steering quantum effects in various systems, such as plasmonics, metamaterials, and topological photonics. Our scheme no longer relies on destructive interference between different modes [8,52], or additional gain media [90,91], which may enable novel quantum devices assisted by the loss for the applications of quantum engineering or metrology. C 00 (0) = 1.…”

Section: H E P S Le Psmentioning

confidence: 99%

“…Loss is ubiquitous in nature, which is usually regarded as harmful and undesirable in making and operating quantum devices. Very recently, loss has been found to play an unconventional role in non-Hermitian physics [1][2][3][4], such as loss-induced transparency of light [5,6], lossinduced lasing revival [7], and loss-induced nonreciprocity [8,9]. These pioneering works, however, have mainly focused on the classical regime, i.e., studying loss-tuned optical intensity, instead of quantum correlation of light.…”

mentioning

confidence: 99%

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Loss-Induced Quantum Revival

Huang¹,

Kuang²,

Xu³

et al. 2022

Preprint

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Conventional wisdom holds that quantum effects are fragile and can be destroyed by loss. Here, contrary to general belief, we show how to realize quantum revival of optical correlations at the singlephoton level with the help of loss. We find that, accompanying loss-induced transparency of light in a nonlinear optical-molecule system, quantum suppression and revival of photonic correlations can be achieved. Specifically, below critical values, adding loss into the system leads to suppressions of both optical intensity and its non-classical correlations; however, by further increasing the loss beyond the critical values, quantum revival of photon blockade (PB) can emerge, resulting in loss-induced switch between single-PB and two-PB or super-Poissonian light. Our work provides a strategy to reverse the effect of loss in fully quantum regime, opening up a counterintuitive route to explore and utilize loss-tuned single-photon devices for quantum technology.

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Section: H E P S Le Psmentioning

confidence: 99%

mentioning

confidence: 99%

Loss-Induced Quantum Revival

Huang¹,

Kuang²,

Xu³

et al. 2022

Preprint

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“…Non-Hermitian metasurfaces with two unequal losses have been proposed to overcome this challenge [50,51]. Although the losses such as intrinsic loss and radiation loss in photonic devices are usually minimized in optics and photonics to enhance efficiency, EPs in non-Hermitian systems can pave a new way in converting the undesired losses into advantages for expanding the functionalities of photonic devices [52,53]. For example, Dong et al investigated a loss-assisted non-Hermitian metasurface operating at an EP to show unidirectional retro-reflection [54].…”

Section: Unidirectional Propagationmentioning

confidence: 99%

Non-Hermitian Electromagnetic Metasurfaces at Exceptional Points (Invited Review)

Li¹,

Cao²,

Li³

et al. 2021

PIER

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Exceptional points are spectral singularities in non-Hermitian systems at which two or more eigenvalues and their corresponding eigenvectors simultaneously coalesce. Originating from quantum theory, exceptional points have attracted significant attention in optics and photonics because their emergence in systems with nonconservative gain and loss elements can give rise to many counterintuitive phenomena. Metasurfaces -two-dimensional artificial electromagnetic materials structured at the subwavelength scale -can provide a versatile platform for exploring such non-Hermitian phenomena through the addition of dissipation and amplification within their unit cells. These concepts enable a wide range of exotic phenomena, including unidirectional propagation, adiabatic mode conversion, and ultrasensitive measurements, which can be harnessed for technological applications. In this article, we review the recent advances in exceptional-point and non-Hermitian metasurfaces. We introduce the basic theory of exceptional point and non-Hermiticity in metasurfaces, highlight important achievements and applications, and discuss the future opportunities of non-Hermitian metasurfaces from basic science to emerging technologies.

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“…It is also important to take the imaginary parts (indicating loss and gain of the materials) into account [28]. For example, a topological gallery insulator based on a gain medium enables the out-coupling of topological acoustic equivalent lasing (AEL) modes with the desired handedness [28], and nonreciprocity energy transmission can be realized by lossy materials [29][30][31][32].…”

Section: Introductionmentioning

confidence: 99%

Acoustic Equivalent Lasing and Coherent Perfect Absorption Based on a Conjugate Metamaterial Sphere

Wei

Zhu

et al. 2022

Applied Sciences

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Acoustic conjugate metamaterials (ACMs), in which the imaginary parts of the effective complex mass density and bulk compressibility are cancelled out in the refractive index, possess the elements of loss and gain simultaneously. Previous works have focused on panel ACMs for plane wave incidence. In this paper, we explore the extraordinary scattering properties, including the acoustic equivalent lasing (AEL) and coherent perfect absorption (CPA) modes, of a three-dimensional ACM sphere, where incident spherical waves with specific topological orders could be extremely scattered and totally absorbed, respectively. Theoretical analysis and numerical simulations show that the AEL or CPA mode with a single order can be realized with a small monolayer ACM sphere with appropriate parameters. A huge (relative to incident wavelength) ACM sphere with pure imaginary parameters could support the even- (or odd-) order AEL and odd- (or even-) order CPA modes simultaneously. In addition, the AEL and/or CPA with multiple orders could be realized based on a small multilayered ACM sphere. The proposed ACM sphere may provide an alternative method to design acoustic functional devices, such as amplifiers and absorbers.

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Loss-induced nonreciprocity

Cited by 60 publications

References 49 publications

Loss-Induced Quantum Revival

Loss-Induced Quantum Revival

Non-Hermitian Electromagnetic Metasurfaces at Exceptional Points (Invited Review)

Acoustic Equivalent Lasing and Coherent Perfect Absorption Based on a Conjugate Metamaterial Sphere

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