Kienzler D, Flühmann C, Negnevitsky V, Lo H-Y, Marinelli M, Nadlinger D, Home J P
Institute for Quantum Electronics, ETH Zürich, Otto-Stern-Weg 1, 8093 Zürich, Switzerland.
Phys Rev Lett. 2016 Apr 8;116(14):140402. doi: 10.1103/PhysRevLett.116.140402. Epub 2016 Apr 5.
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 Δα=15.6, corresponding to a distance of 240 nm between the two superposed wave packets.
我们直接观测了两个相距较远的囚禁离子机械振子波包之间的量子干涉。利用一种有 heralded 测量的自旋 - 运动纠缠态来创建叠加态。通过能量本征态布居来观测波包干涉。我们通过引入在位移基和压缩基中测量福克态布居的探测哈密顿量来重构这些态的维格纳函数。具有 8 分贝压缩的压缩基测量允许对 Δα = 15.6 时的干涉进行测量，这对应于两个叠加波包之间 240 纳米的距离。
