»ã±¨±êÌâ (Title)£º»ùÓÚÂý¹â¹Â×ӵĹâÓëÔ×Ó×ÔÐýµÄÁ¿×ÓѹËõ£¨Quantum Squeezing of Light and Atomic Spins Based on Slow-Light Solitons£©
»ã±¨ÈË (Speaker)£º»Æ¹úÏè ½ÌÊÚ£¨»ª¶«Ê¦·¶´óѧ£©
»ã±¨¹¦·ò (Time)£º2024Äê11ÔÂ26ÈÕ£¨Öܶþ£©10:00-11:30
»ã±¨µØÖ· (Place)£ºÐ£±¾²¿G601
Ô¼ÇëÈË(Inviter)£ºÖÓ½¨ÐÂ
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»ã±¨ÌáÒª£ºIn this talk, I shall give a presentation of our recent investigations on the quantum squeezing of slow-light solitons in coherent atomic systems working under the condition of electromagnetically induced transparency (EIT). Starting from Heisenberg-Langevin-Maxwell equations governing the quantum dynamics of atoms and probe laser field in a three-level atomic system, we derive a quantum nonlinear Schr?dinger equation controlling the evolution of the probe-field envelope. By diagonalizing effective Hamiltonian via Bogoliubov transformation, we carry out detailed calculations on the quantum fluctuations of slow-light solitons, and show that the eigenmodes of the quantum fluctuations constitute a complete and biorthonormal set, obtained by solving Bogoliubov-de Gennes equations analytically. Based on these results, we show that, due to the giant Kerr nonlinearity induced by the EIT, significant quantum squeezing of both bright and dark solitons can be realized within a very short propagation distance. We also show that it is possible to realize simultaneous quantum squeezing of light polarizations and atomic spins in a four-level atomic gas via a double EIT. The results reported here are beneficial for understanding the quantum property of slow-light solitons and for realizing quantum squeezing of light and atomic spins via EIT.
