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Harmonic Oscillator State Synthesis by Reservoir

Event Details

Event Dates: 

Friday, June 12, 2015 - 12:00pm

Seminar Location: 

  • JILA X590

Speaker Name(s): 

Daniel Kienzler

Speaker Affiliation(s): 

ETH Zurich, Institute for Quantum Electronics
Seminar Type/Subject

Scientific Seminar Type: 

  • Other

Seminar Type Other: 

JILA Internal Meeting

Event Details & Abstract: 

I will describe recent experiments in which we have generated a range of Gaussian states of motion of a single trapped ion using reservoir engineering [1]. We make use of multi-frequency laser fields to couple the motional oscillator to a zero temperature reservoir realized through optical pumping of the ion's spin. The engineered spin-motion couplings lead to cooling in a rotated state basis, producing as the ground state the desired state of interest. We use similar couplings to demonstrate novel measurement techniques for oscillator states, providing a direct measure of state fidelity, and also show a sqrt{n} scaling in the engineered basis which is analogous to the Jaynes-Cummings result. These oscillator state measurements have been verified independently first by a Fock state decomposition, and using a second technique involving the use of state-dependent forces to entangle the spin and motion. The latter generates squeezed-wavepacket analogues to the well known Schrodinger's cat states. We observe re-coherence after separating the entangled wavepackets by up 19 times the ground state r.m.s. extent which corresponds to 56 times the width of the squeezed wavepacket  [2].

[1] D. Kienzler et al. Science 347, 6217 (2014) [2] H-Y. Lo et al., Nature
521, 336–339 (2015) 

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