Non-Hermitian ring laser gyroscopes with enhanced Sagnac sensitivity

Hokmabadi, Mohammad P.; Schumer, Alexander; Christodoulides, Demetrios N.; Khajavikhan, Mercedeh

doi:10.1038/s41586-019-1780-4

Cited by 266 publications

(130 citation statements)

References 31 publications

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“…The enhanced Sagnac resonance splitting between two counterpropagating modes has been shown to be independent of the dimensions of the device, leading to the possibility of realizing integrated optical gyroscopes with increased sensitivity with respect to classical Sagnac ones. The effect has been recently experimentally demonstrated in a Brillouin-based integrated optical gyroscope [36] working near its exceptional point and in an RLG-based single-cavity parity-time symmetric gyroscope [37].…”

Section: Quantum Photonics For Rotation Sensingmentioning

confidence: 95%

On-Chip Group-IV Heisenberg-Limited Sagnac Interferometric Gyroscope at Room Temperature

Leonardis

Soref

Carlo

et al. 2020

Sensors

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A room-temperature strip-guided “manufacturable” Silicon-on-Insulator (SOI)/GeSn integrated-photonics quantum-gyroscope chip operating at 1550 nm is proposed and analysed. We demonstrate how the entangled photons generated in Si Spontaneous Four Wave Mixing (SFWM) can be used to improve the resolution of a Sagnac interferometric gyroscope. We propose different integrated architectures based on degenerate and non-degenerate SFWM. The chip comprises several beam splitters, two SFWM entangled photon sources, a pump filter, integrated Mach–Zehnder interferometric gyro, and an array of waveguide coupled GeSn/Ge/Si single-photon avalanche detectors. The laser pumped SWFM sources generate the signal-idler pairs, which, in turn, are used to measure the two-photon, four-photon, and higher order coincidences, resulting in an increasing of the gyro resolution by a factor of two and four, with respect to the classical approach.

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Section: Quantum Photonics For Rotation Sensingmentioning

confidence: 95%

On-Chip Group-IV Heisenberg-Limited Sagnac Interferometric Gyroscope at Room Temperature

Leonardis

Soref

Carlo

et al. 2020

Sensors

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“…From a practical perspective, the augmented response enabled via NH degeneracies has found direct applications in Sagnac-based gyroscopes [120], which can be realized by retrofitting a helium-neon ring laser gyroscope (He-Ne RLG) with a Faraday rotator and a half-wave plate (see Figure 3C) [121]. Combined with Brewster windows surrounding the gain tube, these components can then introduce a differential gain/loss contrast in the system, necessary for establishing an EP.…”

Section: Enhancement Effects Around Epsmentioning

confidence: 99%

“…(B) A coupled microtoroid phonon laser operating at an exceptional point[53]. (C, D) Enhanced Sagnac effect in EP-based gyroscopes implemented in a ring laser gyroscope[121] and a Brillouin laser cavity[122], respectively.…”

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confidence: 99%

Non-Hermitian and topological photonics: optics at an exceptional point

et al. 2020

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In the past few years, concepts from non-Hermitian (NH) physics, originally developed within the context of quantum field theories, have been successfully deployed over a wide range of physical settings where wave dynamics are known to play a key role. In optics, a special class of NH Hamiltonians – which respects parity-time symmetry – has been intensely pursued along several fronts. What makes this family of systems so intriguing is the prospect of phase transitions and NH singularities that can in turn lead to a plethora of counterintuitive phenomena. Quite recently, these ideas have permeated several other fields of science and technology in a quest to achieve new behaviors and functionalities in nonconservative environments that would have otherwise been impossible in standard Hermitian arrangements. Here, we provide an overview of recent advancements in these emerging fields, with emphasis on photonic NH platforms, exceptional point dynamics, and the very promising interplay between non-Hermiticity and topological physics.

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“…Over the past years, this effect has attracted considerable attention and has been demonstrated in various optical [6][7][8], electrical [9] and mechanical [10] settings. Apart from purely fundamental interest, this mechanism also has many important practical consequences, for example, for the operation of multi-mode lasers [11,12], enhanced measurements [13][14][15][16][17][18], the bandstructure of dissipative lattice systems [19][20][21][22] or energy transport at macroscopic [23] and microscopic [24,25] scales.…”

Section: Introductionmentioning

confidence: 99%

Report on scipost_202008_00009v1

2020

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The effect of PT-symmetry breaking in coupled systems with balanced gain and loss has recently attracted considerable attention and has been demonstrated in various photonic, electrical and mechanical systems in the classical regime. However, it is still an unsolved problem how to generalize the concept of PT symmetry to the quantum domain, where the conventional definition in terms of non-Hermitian Hamiltonians is not applicable. Here we introduce a symmetry relation for Liouville operators that describe the dissipative evolution of arbitrary open quantum systems. Specifically, we show that the invariance of the Liouvillian under this symmetry transformation implies the existence of stationary states with preserved and broken parity symmetry. As the dimension of the Hilbert space grows, the transition between these two limiting phases becomes increasingly sharp and the classically expected PTsymmetry breaking transition is recovered. This quantum-to-classical correspondence allows us to establish a common theoretical framework to identify and accurately describe PT-symmetry breaking effects in a large variety of physical systems, operated both in the classical and quantum regimes. B Fully symmetric steady state 11 C Random jump operators 12 References 13

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Non-Hermitian ring laser gyroscopes with enhanced Sagnac sensitivity

Cited by 266 publications

References 31 publications

On-Chip Group-IV Heisenberg-Limited Sagnac Interferometric Gyroscope at Room Temperature

On-Chip Group-IV Heisenberg-Limited Sagnac Interferometric Gyroscope at Room Temperature

Non-Hermitian and topological photonics: optics at an exceptional point

Report on scipost_202008_00009v1

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