Spectroscopy and thermometry of drumhead modes in a mesoscopic trapped-ion crystal using entanglement

Brian C. Sawyer, Joseph W. Britton, Adam C. Keith, C. C.Joseph Wang, James K. Freericks, Hermann Uys, Michael J. Biercuk, John J. Bollinger

Research output: Contribution to journalArticlepeer-review

48 Scopus citations

Abstract

We demonstrate spectroscopy and thermometry of individual motional modes in a mesoscopic 2D ion array using entanglement-induced decoherence as a method of transduction. Our system is a ∼400μm-diameter planar crystal of several hundred Be+9 ions exhibiting complex drumhead modes in the confining potential of a Penning trap. Exploiting precise control over the Be+9 valence electron spins, we apply a homogeneous spin-dependent optical dipole force to excite arbitrary transverse modes with an effective wavelength approaching the interparticle spacing (∼20μm). Center-of-mass displacements below 1 nm are detected via the entanglement of spin and motional degrees of freedom.

Original languageEnglish
Article number213003
JournalPhysical Review Letters
Volume108
Issue number21
DOIs
StatePublished - May 24 2012
Externally publishedYes

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