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AIP conference proceedings

Cavity QED with ion Coulomb crystals

Peter F. Herskind, A. Mortensen, Jens Lykke Sørensen, Michael Drewsen

Published Jan 1, 2006• 1 citation
Publisher

Abstract

We present a proposal for using ion Coulomb crystals in cavity QED experiments. Due to the high degree of spatial confinement of ions in Coulomb crystals, such ion ensembles will have some advantages over systems based on neutral atoms. Simulations of a system with up to 3200 ions coupled to a standing wave cavity with a finesse of about 4000 is presented, and show that our setup can be used for experiments within the strongly coupled regime of cavity QED. Furthermore, the potential of the system as a quantum memory device for light, is considered.

DOI
10.1063/1.2387935

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•May 22, 2017•0 citations
We present a proposal for using ion Coulomb crystals in cavity QED experiments. Due to the high degree of spatial confinement of ions in Coulomb crystals, such ion ensembles will have some advantages over systems based on neutral atoms. Simulations of a system with up to 3200 ions coupled to a standing wave cavity with a finesse of about 4000 is presented, and show that our setup can be used for experiments within the strongly coupled regime of cavity QED. Furthermore, the potential of the system as a quantum memory device for light, is considered.
A detailed description and theoretical analysis of experiments achieving coherent coupling between an ion Coulomb crystal and an optical cavity field are presented. The various methods used to measure the coherent coupling rate between large ion Coulomb crystals in a linear quadrupole radiofrequency ion trap and a single-field mode of a moderately high-finesse cavity are described in detail. Theoretical models based on a semiclassical approach are applied in assessment of the experimental results of P. F. Herskind et al.[Nature Phys. 5, 494 (2009)] and of complementary new measurements. Generally, a very good agreement between theory and experiments is obtained.
Cavity Quantum Electrodynamics (CQED) is an attractive platform for the realization of efficient light-matter quantum interfaces at the single photon level. Such interfaces are key elements for the development of quantum information and communication science due to the need for swapping information between flying and stationary qubits. Here, we report on the first CQED demonstration of collective strong coupling between atomic ions in a solid in the form of an ion Coulomb crystal and an optical field [1].
Entanglement is an established resource in quantum information processing, and there is a clear imperative to study many-body systems both in quantum technology applications and for probing fundamental physical laws. Ion trap cavity quantum electrodynamics is a highly promising platform for research. Prerequisites are the controlled coupling of many ions to the cavity field along with the ability to initialize the quantum states and drive coherent transitions between them. A coaxial ion trap and high finesse cavity system has been shown to couple strings of up to five ions to the cavity mode with nearly optimal coupling strength thanks to precise control over their positions in the standing wave and their mutual Coulomb interaction. The predictive power of the theoretical model demonstrates that the scheme can be extended to more ions or to higher coupling regimes. In a separate experiment it has been demonstrated that a quantum state can be initialized, before coherently transferring the population to a qubit state through the cavity interaction. The emission of polarized photons in the cavity mode has been measured, taking the system closer to the generation of cluster states for quantum information research and fundamental studies in many-body entanglement. Building on the aforementioned work, an infrastructure has been put in place for the direct observation of vacuum Rabi oscillations between a single ion and the cavity. In this scheme, the contribution to the dynamics from the dominant incoherent channel is minimized through post-selection of the data. As a quantum system coupled to a reservoir with memory, it will provide experimental constraints on theoretical work in the field of non-Markovian dynamics.