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Observation of Quantum Interference between Separated Mechanical Oscillator Wave Packets

PHYSICAL REVIEW LETTERS (2016)

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PHYSICAL REVIEW LETTERS
卷 116, 期 14, 页码 -

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AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.116.140402

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Physics, Multidisciplinary

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  1. Swiss National Science Foundation through the National Centre of Competence in Research for Quantum Science and Technology (QSIT) [200020_153430]
  2. ETH Research Grant [ETH-18 12-2]
  3. Swiss National Science Foundation (SNF) [200020_153430] Funding Source: Swiss National Science Foundation (SNF)

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We directly observe the quantum interference between two well-separated trapped-ion mechanical oscillator wave packets. The superposed state is created from a spin-motion entangled state using a heralded measurement. Wave packet interference is observed through the energy eigenstate populations. We reconstruct the Wigner function of these states by introducing probe Hamiltonians which measure Fock state populations in displaced and squeezed bases. Squeezed-basis measurements with 8 dB squeezing allow the measurement of interference for Delta alpha = 15.6, corresponding to a distance of 240 nm between the two superposed wave packets.

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