期刊
PHYSICAL REVIEW LETTERS
卷 117, 期 14, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.117.143003
关键词
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资金
- EPSRC [EP/J014664/1]
- EPSRC as part of UK Hub in Networked Quantum Information Technologies (NQIT) [EP/M013243/1]
- Royal Society
- John F Templeton Foundation [39530]
- Foundational Questions Institute (FQXi)
- Imperial CSC scholarship
- Leverhulme Trust Research Grant [RPG-2014-055]
- Engineering and Physical Sciences Research Council [EP/J014664/1, EP/N031105/1, EP/M013243/1] Funding Source: researchfish
- EPSRC [EP/N031105/1, EP/M013243/1, EP/J014664/1] Funding Source: UKRI
We propose an interferometric scheme based on an untrapped nano-object subjected to gravity. The motion of the center of mass (c.m.) of the free object is coupled to its internal spin system magnetically, and a free flight scheme is developed based on coherent spin control. The wave packet of the test object, under a spin-dependent force, may then be delocalized to a macroscopic scale. A gravity induced dynamical phase (accrued solely on the spin state, and measured through a Ramsey scheme) is used to reveal the above spatially delocalized superposition of the spin-nano-object composite system that arises during our scheme. We find a remarkable immunity to the motional noise in the c.m. (initially in a thermal state with moderate cooling), and also a dynamical decoupling nature of the scheme itself. Together they secure a high visibility of the resulting Ramsey fringes. The mass independence of our scheme makes it viable for a nano-object selected from an ensemble with a high mass variability. Given these advantages, a quantum superposition with a 100 nm spatial separation for a massive object of 10(9) amu is achievable experimentally, providing a route to test postulated modifications of quantum theory such as continuous spontaneous localization.
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