代表论文

Proposal for a quantum delayed-choice experiment with a spin-mechanical setup




作者: Peng-Bo Li and Fu-Li Li
发表/完成日期: 2016-10-27
期刊名称: Phys. Rev. A
期卷: 94
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论文简介
We describe an experimentally feasible protocol for performing a variant of the quantum delayed-choice
experiment with massive objects. In this scheme, a single nitrogen-vacancy (NV) center in diamond driven
by microwave fields is dispersively coupled to a massive mechanical resonator. A double-pulse Ramsey
interferometer can be implemented with the spin-mechanical setup, where the second Ramsey microwave pulse
drives the spin conditioned on the number states of the resonator. The probability for finding the NV center in
definite spin states exhibits interference fringes when the mechanical resonator is prepared in a specific number
state. On the other hand, the interference is destroyed if the mechanical resonator stays in some other number
states. The wavelike and particlelike behavior of the NV spin can be superposed by preparing the mechanical
resonator in a superposition of two distinct number states. Thus a quantum version of Wheeler’s delayed-choice
experiment could be implemented, allowing fundamental tests of quantum mechanics on a macroscopic scale.