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SJTU Researchers Achieved Synthetic Anti-PT Symmetry in a Single Microcavity

March 16, 2020      Author: Zhang Fangxing

 

Recently, Professor Wan Wenjie’s team from UM-SJTU Joint Institution (JI, SJTU), published their latest findings on non-Hermitian systems in Physical Review Letter, a leading international journal in physics. The corresponding authors of this paper titled “Synthetic Anti-PT Symmetry in a Single Microcavity” are Wan Wenjie and Ge Li, an associate professor in CUNY, and the first author is Zhang Fangxing, a doctoral student from JI.

This research provides a new paradigm towards the investigation of non-Hermitian physics in a synthetic photonic dimension. It also offers a unique perspective on the relationship between non-Hermitian physics and nonlinear optical processes. The related results will be of reference value for the scientific community in studying a wide range of phenomena including second harmonic generation, parametric amplification, and four-wave mixing.

 

Abstract

Non-Hermitian systems based on parity-time (PT) and anti-PT symmetry reveal rich physics beyond the Hermitian regime. So far, realizations of such symmetric systems have been limited to the spatial domain. Here we theoretically and experimentally demonstrate synthetic anti-PT symmetry in a spectral dimension induced by nonlinear Brillouin scattering in a single optical microcavity, where Brillouin scattering induced transparency or absorption in two spectral resonances provides the optical gain and loss to observe a phase transition between two symmetry regimes. This scheme provides a new paradigm towards the investigation of non-Hermitian physics in a synthetic photonic dimension for all-optical signal processing and quantum information science.

 

 

Link: https://doi.org/10.1103/PhysRevLett.124.053901

 

 

Translated by Fu Jin

 

 
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