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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
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: |
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| 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) | ||||||
| Adapted As: |
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