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Free nano-object Ramsey Interferometry for large quantum superpositions

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Wan, C., Scala, M., Morley, Gavin, Rahman, A. T. M. A., Ulbricht, H., Bateman, J., Barker, P. F., Bose, S. and Kim, M. S. (2016) Free nano-object Ramsey Interferometry for large quantum superpositions. Physical Review Letters, 117 (14). 143003 . doi:10.1103/PhysRevLett.117.143003 ISSN 0031-9007.

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Official URL: http://dx.doi.org/10.1103/PhysRevLett.117.143003

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Abstract

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 109  amu is achievable experimentally, providing a route to test postulated modifications of quantum theory such as continuous spontaneous localization.

Item Type: Journal Article
Divisions: Faculty of Science, Engineering and Medicine > Science > Physics
Journal or Publication Title: Physical Review Letters
Publisher: American Physical Society
ISSN: 0031-9007
Official Date: 28 September 2016
Dates:
DateEvent
28 September 2016Published
26 January 2016Submitted
Volume: 117
Number: 14
Article Number: 143003
DOI: 10.1103/PhysRevLett.117.143003
Status: Peer Reviewed
Publication Status: Published
Access rights to Published version: Open Access (Creative Commons)
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