title: Ultrafast spin-motion entanglement and interferometry with a single atom.
abstract: We report entanglement of a single atom's hyperfine spin state with its motional state in a time scale of less than 3 ns. We engineer a short train of intense laser pulses to impart a spin-dependent momentum transfer of ± 2 ħk. Using pairs of momentum kicks, we create an atomic interferometer and demonstrate collapse and revival of spin coherence as the motional wave packet is split and recombined. The revival after a pair of kicks occurs only when the second kick is delayed by an integer multiple of the harmonic trap period, a signature of entanglement and disentanglement of the spin with the motion. Such quantum control opens a new regime of ultrafast entanglement in atomic qubits.
authors.affiliation: Joint Quantum Institute, University of Maryland Department of Physics and National Institute of Standards and Technology, College Park, Maryland 20742, USA.
authors.forename: J
authors.initials: J
authors.lastname: Mizrahi
authors.affiliation: Joint Quantum Institute, University of Maryland Department of Physics and National Institute of Standards and Technology, College Park, Maryland 20742, USA.
authors.forename: C
authors.initials: C
authors.lastname: Senko
authors.affiliation: Joint Quantum Institute, University of Maryland Department of Physics and National Institute of Standards and Technology, College Park, Maryland 20742, USA.
authors.forename: B
authors.initials: B
authors.lastname: Neyenhuis
authors.affiliation: Joint Quantum Institute, University of Maryland Department of Physics and National Institute of Standards and Technology, College Park, Maryland 20742, USA.
authors.forename: K G
authors.initials: KG
authors.lastname: Johnson
authors.affiliation: Department of Physics and Astronomy, University of California Los Angeles, Los Angeles, California 90095, USA.
authors.forename: W C
authors.initials: WC
authors.lastname: Campbell
authors.affiliation: Physics Department, Colby College, Waterville, Maine 04901, USA.
authors.forename: C W S
authors.initials: CW
authors.lastname: Conover
authors.affiliation: Joint Quantum Institute, University of Maryland Department of Physics and National Institute of Standards and Technology, College Park, Maryland 20742, USA.
authors.forename: C
authors.initials: C
authors.lastname: Monroe