Free nano-object Ramsey interferometry for large quantum superpositions

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Title: Free nano-object Ramsey interferometry for large quantum superpositions
Authors: Kim, MS
Wan, C
Scala, M
Morley, GW
Rahman, ATMA
Ulbricht, H
Bateman, J
Barker, PF
Bose, S
Item Type: Journal Article
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 ight 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 nd 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 100nm spatial separation for a massive object of 10⁹ amu is achievable experimentally, providing a route to test postulated modi cations of quantum theory such as continuous spontaneous localisation.
Issue Date: 28-Sep-2016
Date of Acceptance: 5-Jul-2016
ISSN: 1079-7114
Publisher: American Physical Society
Journal / Book Title: Physical Review Letters
Volume: 117
Copyright Statement: This article is available 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.
Sponsor/Funder: Engineering & Physical Science Research Council (E
The Royal Society
Funder's Grant Number: CJATH
Keywords: General Physics
02 Physical Sciences
Publication Status: Published
Open Access location:
Article Number: 143003
Appears in Collections:Quantum Optics and Laser Science
Faculty of Natural Sciences

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