BEGIN:VCALENDAR VERSION:2.0 PRODID:researchseminars.org CALSCALE:GREGORIAN X-WR-CALNAME:researchseminars.org BEGIN:VEVENT SUMMARY:E. A. Anashkina DTSTART:20240902T120000Z DTEND:20240902T130000Z DTSTAMP:20260423T005714Z UID:QOART/6 DESCRIPTION:Title: Ph ase-sensitive symmetry breaking in microresonators with Kerr nonlinearity< /a>\nby E. A. Anashkina as part of Quantum Optics and Related Topics\n\n\n Abstract\nSpontaneous symmetry breaking (SSB) is a fundamentally important concept known in many areas of physics: particle physics\, condensed matt er physics\, and optics\, to name a few. In photonics\, there has been an increasing interest in studying symmetry breaking\, chiral and nonreciproc al light propagation in optical macro- and microresonators with cubic nonl inearities. Here\, we demonstrate theoretically and experimentally that li near coupling due to the backscattering between two counterpropagating mod es in a microresonator with Kerr nonlinearity leads to extreme sensitivity of the intensity asymmetry of light states to the relative phase between the bidirectional pumps of equal power. In the absence of linear coupling\ , the relative pump phase does not affect counterpropagating intraresonato r intensities\, and two asymmetric states arise due to spontaneous symmetr y breaking. Contrariwise\, in the presence of weak linear intermode coupli ng\, the asymmetry of the states is deterministically controlled via chang es in phase (for all phases except 0 and π). Spontaneous symmetry breakin g at zero phase is suppressed when the linear intermode coupling is increa sed\, while for the π phase it can be enhanced\, so that the overall thre shold for the spontaneous symmetry breaking can be significantly lower for nonzero linear coupling. These results are important for fundamental unde rstanding of the processes in Kerr resonators and other systems with Kerr- like nonlinearities and linear intermode coupling and have high prospects for the development of photonic devices such as ultrasensitive sensors. Mo reover\, the study of such systems also allows one to obtain fundamental r esults that can be used outside of optics due to quantum-optical analogies (for example\, for studying the well-known Bose-Hubbard dimer).\n\nThe wo rk was supported by the Russian Science Foundation\, grant No.20-72-10188- P.\n\nE.A. Anashkina\, A.V. Andrianov\, “Phase-sensitive symmetry breaki ng in bidirectionally pumped Kerr microresonators\,” arXiv preprint arXi v:2407.07594 (2024).\n LOCATION:https://researchseminars.org/talk/QOART/6/ END:VEVENT END:VCALENDAR