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Tolerance in the Ramsey interference of a trapped nanodiamond

Wan, C; Scala, M; Bose, S; Frangeskou, AC; Rahman, ATMA; Morley, GW; Barker, PF; (2016) Tolerance in the Ramsey interference of a trapped nanodiamond. Physical Review A , 93 (4) , Article 043852. 10.1103/PhysRevA.93.043852. Green open access

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Abstract

In the scheme recently proposed by M. Scala et al. [Phys. Rev. Lett. 111, 180403 (2013)], a gravity-dependent phase shift is induced on the spin of a nitrogen-vacancy (NV) center in a trapped nanodiamond by the interaction between its magnetic moment and the quantized motion of the particle. This provides a way to detect spatial quantum superpositions by means of only spin measurements. Here, the effect of unwanted coupling with other motional degrees of freedom is considered, and we show that it does not affect the validity of the scheme. Both this coupling and the additional error source due to misalignment between the quantization axis of the NV center spin and the trapping axis are shown not to change the qualitative behavior of the system, so that a proof-of-principle experiment can be neatly performed. Our analysis, which shows that the scheme retains the important features of not requiring ground-state cooling and of being resistant to thermal fluctuations, can be useful for several schemes which have been proposed recently for testing macroscopic superpositions in trapped microsystems.

Type: Article
Title: Tolerance in the Ramsey interference of a trapped nanodiamond
Open access status: An open access version is available from UCL Discovery
DOI: 10.1103/PhysRevA.93.043852
Publisher version: http://dx.doi.org/10.1103/PhysRevA.93.043852
Additional information: ©2016 American Physical Society
Keywords: Science & Technology, Physical Sciences, Optics, Physics, Atomic, Molecular & Chemical, Physics, QUANTUM, DIAMOND, VACUUM, DECOHERENCE, REDUCTION, DYNAMICS, SYSTEMS
UCL classification: UCL
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Physics and Astronomy
URI: https://discovery-pp.ucl.ac.uk/id/eprint/1518147
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