Abstract
We study electromagnetically induced transparency in a three-level ladder type configuration in ultracold atomic gases, where the upper level is an electronically highly excited Rydberg state. An effective distance dependent two-body dephasing can be induced in a regime where dipole-dipoles interaction couple nearly degenerate Rydberg pair states. We show that strong two-body dephasing can enhance the excitation blockade of neighboring Rydberg atoms. Due to the dissipative blockade, transmission of the probe light is reduced drastically by the two-body dephasing in the transparent window. The reduction of transmission is accompanied by a strong photon-photon anti-bunching. Around the Autler-Townes doublets, the photon bunching is amplified by the two-body dephasing, while transmission is largely unaffected. Besides relevant to the ongoing Rydberg atom studies, our study moreover provides a setting to explore and understand two-body dephasing dynamics in many-body systems.
Highlights
Induced transparency (EIT) [1,2,3] plays a pivotal role in quantum and nonlinear optics [4,5,6,7,8] and has been investigated intensively in the past two decades [9,10,11,12]
We study Rydberg-Electromagnetically induced transparency (EIT) in a setting where both van der Waals interactions and two-body dephasing are present
We consider a cold gas of N Rb atoms, which are described by a three-level ladder type configuration with a long-lived ground state |g, a low-lying excited state |e with decay rate γe, and a highly excited Rydberg state |d
Summary
Induced transparency (EIT) [1,2,3] plays a pivotal role in quantum and nonlinear optics [4,5,6,7,8] and has been investigated intensively in the past two decades [9,10,11,12]. We study Rydberg-EIT in a setting where both van der Waals interactions and two-body dephasing are present The latter could be induced by dipolar couplings between different Rydberg pair states when they are nearly degenerate [31,39,40,41,42,43,44,45,46,47,48,49,50,51,52]. We derive a master equation in which van der Waals (vdW) interactions and two-body dephasing (TBD) are both present in a target Rydberg state. We achieve this by numerically solving the master equation for two atoms, and analyze an effective Hamiltonian.
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