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Free Nano-Object Ramsey Interferometry for Large Quantum Superpositions

C. Wan, M. Scala, G. W. Morley, ATM. A. Rahman, H. Ulbricht, James Bateman Orcid Logo, P. F. Barker, S. Bose, M. S. Kim

Physical Review Letters, Volume: 117, Issue: 14

Swansea University Author: James Bateman Orcid Logo

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DOI (Published version): 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 wavepacket of the tes...

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Published in: Physical Review Letters
ISSN: 0031-9007 1079-7114
Published: American Physical Society (APS) 2016
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URI: https://cronfa.swan.ac.uk/Record/cronfa30573
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spelling 2020-07-17T12:44:40.1181609 v2 30573 2016-10-14 Free Nano-Object Ramsey Interferometry for Large Quantum Superpositions 3b46126aa511514414c6c42c9c6f0654 0000-0003-4885-2539 James Bateman James Bateman true false 2016-10-14 SPH 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 wavepacket 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 delocalised 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 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 localisation. Journal Article Physical Review Letters 117 14 American Physical Society (APS) 0031-9007 1079-7114 28 9 2016 2016-09-28 10.1103/physrevlett.117.143003 COLLEGE NANME Physics COLLEGE CODE SPH Swansea University 2020-07-17T12:44:40.1181609 2016-10-14T10:34:01.9440396 Faculty of Science and Engineering School of Biosciences, Geography and Physics - Physics C. Wan 1 M. Scala 2 G. W. Morley 3 ATM. A. Rahman 4 H. Ulbricht 5 James Bateman 0000-0003-4885-2539 6 P. F. Barker 7 S. Bose 8 M. S. Kim 9 0030573-02122016144638.pdf PhysRevLett.117.143003.pdf 2016-12-02T14:46:38.4500000 Output 533445 application/pdf Version of Record true 2016-12-02T00:00:00.0000000 Published by the American Physical Society under the terms of the Creative Commons Attribution 3.0 License. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. true
title Free Nano-Object Ramsey Interferometry for Large Quantum Superpositions
spellingShingle Free Nano-Object Ramsey Interferometry for Large Quantum Superpositions
James Bateman
title_short Free Nano-Object Ramsey Interferometry for Large Quantum Superpositions
title_full Free Nano-Object Ramsey Interferometry for Large Quantum Superpositions
title_fullStr Free Nano-Object Ramsey Interferometry for Large Quantum Superpositions
title_full_unstemmed Free Nano-Object Ramsey Interferometry for Large Quantum Superpositions
title_sort Free Nano-Object Ramsey Interferometry for Large Quantum Superpositions
author_id_str_mv 3b46126aa511514414c6c42c9c6f0654
author_id_fullname_str_mv 3b46126aa511514414c6c42c9c6f0654_***_James Bateman
author James Bateman
author2 C. Wan
M. Scala
G. W. Morley
ATM. A. Rahman
H. Ulbricht
James Bateman
P. F. Barker
S. Bose
M. S. Kim
format Journal article
container_title Physical Review Letters
container_volume 117
container_issue 14
publishDate 2016
institution Swansea University
issn 0031-9007
1079-7114
doi_str_mv 10.1103/physrevlett.117.143003
publisher American Physical Society (APS)
college_str Faculty of Science and Engineering
hierarchytype
hierarchy_top_id facultyofscienceandengineering
hierarchy_top_title Faculty of Science and Engineering
hierarchy_parent_id facultyofscienceandengineering
hierarchy_parent_title Faculty of Science and Engineering
department_str School of Biosciences, Geography and Physics - Physics{{{_:::_}}}Faculty of Science and Engineering{{{_:::_}}}School of Biosciences, Geography and Physics - Physics
document_store_str 1
active_str 0
description 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 wavepacket 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 delocalised 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 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 localisation.
published_date 2016-09-28T03:37:10Z
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score 10.997843

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