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Controlling the potential landscape and normal modes of ion Coulomb crystals by a standing wave optical potential
Thomas Lauprêtre, Rasmus B. Linnet, Ian D. Leroux +3
Light-induced control of ions within small Coulomb crystals is investigated. By intense intracavity optical standing wave fields, subwavelength localization of individual ions is a…
Multi-mode double-bright EIT cooling
Nils Scharnhorst, Javier Cerrillo, Johannes Kramer +4
We developed a multi-mode ground state cooling technique based on electromagnetically-induced transparency (EIT). By involving an additional ground and excited state, two individua…
Experimental and theoretical investigation of a multi-mode cooling scheme using multiple EIT resonances
Nils Scharnhorst, Javier Cerrillo, Johannes Kramer +4
We introduce and demonstrate double-bright electromagnetically induced transparency (D-EIT) cooling as a novel approach to EIT cooling. By involving an additional ground state, two…
Localization of ions within one-, two- and three-dimensional Coulomb crystals by a standing wave optical potential
Thomas Lauprêtre, Rasmus B. Linnet, Ian D. Leroux +2
We demonstrate light-induced localization of Coulomb-interacting particles in multi-dimensional structures. Subwavelength localization of ions within small multi-dimensional Coulom…
The quantum Allan variance
Krzysztof Chabuda, Ian Leroux, Rafal Demkowicz-Dobrzanski
The instability of an atomic clock is characterized by the Allan variance, a measure widely used to describe the noise of frequency standards. We provide an explicit method to find…
Unitary Cavity Spin Squeezing by Quantum Erasure
Ian D. Leroux, Monika H. Schleier-Smith, Hao Zhang +1
Deterministic light-induced spin squeezing in an atomic gas is limited by photon shot noise or, equivalently, by atomic state information escaping with the light field mediating th…
Microchip-Based Trapped-Atom Clocks
Vladan Vuletic, Ian D. Leroux, Monika H. Schleier-Smith
This is a chapter of a recently published book entitled Atom Chips, edited by Jakob Reichel and Vladan Vuletic. The contents of this chapter include: Basic Principles; Atomic-Fount…
Optomechanical Cavity Cooling of an Atomic Ensemble
Monika H. Schleier-Smith, Ian D. Leroux, Hao Zhang +2
We demonstrate cavity sideband cooling of a single collective motional mode of an atomic ensemble down to a mean phonon occupation number of 2.0(-0.3/+0.9). Both this minimum occup…
Interaction between Atomic Ensembles and Optical Resonators: Classical Description
Haruka Tanji-Suzuki, Ian D. Leroux, Monika H. Schleier-Smith +4
Many effects in the interaction between atoms and a cavity that are usually de-scribed in quantum mechanical terms (cavity quantum electrodynamics, cavity QED) can be understood an…
Orientation-Dependent Entanglement Lifetime in a Squeezed Atomic Clock
Ian D. Leroux, Monika H. Schleier-Smith, Vladan Vuletić
We study experimentally the lifetime of a special class of entangled states in an atomic clock, squeezed spin states. In the presence of anisotropic noise, their lifetime is strong…
Implementation of Cavity Squeezing of a Collective Atomic Spin
Ian D. Leroux, Monika H. Schleier-Smith, Vladan Vuletić
We squeeze unconditionally the collective spin of a dilute ensemble of laser-cooled rubidium-87 atoms using their interaction with a driven optical resonator. The shape and size of…
Squeezing the Collective Spin of a Dilute Atomic Ensemble by Cavity Feedback
Monika H. Schleier-Smith, Ian D. Leroux, Vladan Vuletić
We propose and analyze a simple method to squeeze dynamically and unconditionally the collective spin of a dilute atomic ensemble by interaction with a driven mode of an optical re…
States of an Ensemble of Two-Level Atoms with Reduced Quantum Uncertainty
Monika H. Schleier-Smith, Ian D. Leroux, Vladan Vuletić
We generate entangled states of an ensemble of 5*10^4 rubidium-87 atoms by optical quantum nondemolition measurement. The resonator-enhanced measurement leaves the atomic ensemble,…