C. Senko, J. Mizrahi, W. C. Campbell, K. G. Johnson, C. W. S. Conover, C. Monroe
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.
View original:
http://arxiv.org/abs/1201.6597
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