Ultrafast Spin-Motion Entanglement and Interferometry with a Single Atom

Details Ultrafast Spin-Motion Entanglement and Interferometry with a Single Atom Ultrafast Spin-Motion Entanglement and Interferometry with a Single Atom

2012-01-31

arxiv.org/abs/1201.6597v1

Physics

Quantum Physics

4 pages, 5 pdf figures

Scientific paper

We report entanglement of a single atom's hyperfine spin state with its motional state on a timescale of order 15 ns. We engineer a short train of intense laser pulses to impart a spin-dependent momentum transfer of +/- 2 hbar k. We further create an atomic interferometer using pairs of momentum kicks and demonstrate collapse and revival of spin coherence as the motional wavepacket 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 period of the harmonic trap, a signature of entanglement and disentanglement of the spin with the motion. Such quantum control may allow a new regime of ultrafast entanglement between atomic qubits.

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