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25 April 2024 |
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Spin-motion entanglement and state diagnosis with squeezed oscillator wavepackets | H.-Y. Lo
; D. Kienzler
; L. de Clercq
; M. Marinelli
; V. Negnevitsky
; B. Keitch
; J. P. Home
; | Date: |
22 Dec 2014 | Abstract: | Mesoscopic superpositions of distinguishable coherent states provide an
analog to the Schr"odinger’s cat thought experiment. For mechanical
oscillators these have primarily been realised using coherent wavepackets, for
which the distinguishability arises due to the spatial separation of the
superposed states. Here, we demonstrate superpositions composed of squeezed
wavepackets, which we generate by applying an internal-state dependent force to
a single trapped ion initialized in a squeezed vacuum state with 9 dB reduction
in the quadrature variance. This allows us to characterise the initial squeezed
wavepacket by monitoring the onset of spin-motion entanglement, and to verify
the evolution of the number states of the oscillator as a function of the
duration of the force. In both cases, we observe clear differences between
displacements aligned with the squeezed and anti-squeezed axes. We observe
coherent revivals when inverting the state-dependent force after separating the
wavepackets by more than 19 times the ground state root-mean-square extent,
which corresponds to 56 times the r.m.s. extent of the squeezed wavepacket
along the displacement direction. Aside from their fundamental nature, these
states may be useful for quantum metrology or quantum information processing
with continuous variables. | Source: | arXiv, 1412.7100 | Services: | Forum | Review | PDF | Favorites |
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