Dipolar exchange induced transparency with Rydberg atoms

Abstract

A three-level atomic medium can be made transparent to a resonant probe field in the presence of a strong control field acting on an adjacent atomic transition to a long-lived state, which can be represented by a highly excited Rydberg state. The long-range interactions between the Rydberg state atoms then translate into strong, non-local, dispersive or absorptive interactions between the probe photons, which can be used to achieve deterministic quantum logic gates and single photon sources.Here we show that long-range dipole-dipole exchange interaction with one or more spins-two-level systems represented by atoms in suitable Rydberg states-can play the role of control field for the optically dense medium of atoms. This induces transparency of the medium for a number of probe photons n p not exceeding the number of spins n s , while all the excess photons are resonantly absorbed upon propagation. In the most practical case of a single spin atom prepared in the Rydberg state, the medium is thus transparent only to a single input probe photon. For larger number of spins n s , all n p n s photon components of the probe field would experience transparency but with an n pdependent group velocity.

Many-body interferometry of magnetic polaron dynamics

“…Here we use the fact that for the spin sector V k = const., and the magnon dispersion relation scales as ω k ∝ k 2 , leading to k * ∝ 1/ √ t. We emphasize that collective excitations satisfying these simple scalings can ubiquitously appear in a variety of systems such as multi-component Bose-Einstein condensates [56,57], fermionic gases [54,55], and Rydberg or dipolar gases [58][59][60].…”

“…Moreover, our scheme can effectively enhance signal amplitudes from the impurity because the impurity creates multiple excitations in the bath that can be directly detected in experiments. This novel protocol can be transferred to a multitude of experimental systems [54][55][56][57][58][59][60] in which interferometric schemes are readily available. Our approach thus implies possibilities for enhancing the detectability of impurity physics in a way different from previous studies, where the impurity itself was probed either by radio-frequency [9,22,23,34,35,[40][41][42] or interferometric measurements [49][50][51]61] and thus the signal amplitudes were intrinsically limited by the number of impurities.…”

“…The unbounded generation of spin waves originates from the quadratic nature of the magnon dispersion relation [64]. Importantly, collective excitations having quadratic lowenergy dispersion ubiquitously appear in many other setups such as fermionic gases [54,55], multi-component Bose-Einstein condensates [56,57], and Rydberg or dipolar gases [58][59][60]. This implies a wide applicability of our protocol because interferometric tools of atomic spectroscopy are readily available in these vastly different systems.…”

The effect of oscillator and dipole-dipole interaction on multiple optomechanically induced transparency in cavity optomechanical system

“…On the other hand, there has been a great interest in studying the phenomenon of EIT in the interacting Rydberg atoms system due to the strongly long range dipole-dipole interactions (DDI) or van der Waals interactions and long radiative lifetimes for many years 3 . Based on the essential blockade effect arising from DDI, some novel behaviors in EIT are revealed, such as the transmission reduction 33 , the nonlocal propagation and enhanced absorption 34 , the nonlocal Rydberg EIT 35 , the nonlinear Rydberg-EIT 36 , and the dipolar exchange induced transparency 37 . Furthermore, optomechanical cavity system assisted by Rydberg atomic ensembles has been proposed to investigate the state transfer, sympathetic cooling and the non-classical state preparation 38 , 39 .…”

“…3 Based on the essential blockade effect arising from DDI, some novel behaviors in EIT are revealed, such as the transmission reduction, 33 the nonlocal propagation and enhanced absorption, 34 the nonlocal Rydberg EIT, 35 the nonlinear Rydberg-EIT, 36 and the dipolar exchange induced transparency. 37 Furthermore, optomechanical cavity system assisted by Rydberg atomic ensembles has been proposed to investigate the state transfer, sympathetic cooling and the non-classical state preparation. 38,39 It can also be found that an all-optical transistor can be manipulated by controlling the Rydberg excitation.…”