NDLI: From order to chaos with a spin a twist

Content Provider	IEEE Xplore Digital Library
Author	Jessen, P.S. Deutsch, I.H. Ghose, S.
Copyright Year	2010
Description	Author affiliation: Dept. of Phys. & Astron., Univ. of New Mexico, Albuquerque, NM, USA (Deutsch, I.H.) \|\| CQuIC, Univ. of Arizona, Tucson, AZ, USA (Jessen, P.S.)
Abstract	Laboratory techniques to manipulate and observe ultracold atoms make these an attractive platform for testing new ideas in quantum control and measurement. Over the last decade we have revisited the tensor interaction between light fields and multilevel atoms, and have developed a theoretical framework suited for applications in quantum control and measurement. One important finding is that the combined action of a light shift and magnetic field on an atomic ground state can be used to implement a non-linear Hamiltonian for a hyperfine spin, and that its action can lead to nonlinear spin dynamics such as wavepacket collapse and revival. Using concepts from classical control theory it is straightforward to show that this Hamiltonian is sufficiently general for full control of an arbitrarily large spin. On this foundation we have developed a new protocol for quantum state reconstruction, based on continuous weak measurement of a spin observable during carefully designed coherent evolution. We have further used our tools for control and state reconstruction to implement and verify protocols for optimal control of Cs hyperfine spins, showing that an initial fiducial state can be transformed into any desired target state with a fidelity in the 80-90% range.
Starting Page	1
Ending Page	2
File Size	883066
Page Count	2
File Format	PDF
ISBN	9781557528902
DOI	10.1364/CLEO.2010.JThF2
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2010-05-16
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	OSA
Subject Keyword	Chaos Atomic measurements Magnetic field measurement Protocols Tensile stress Laboratories Optimal control Quantum mechanics Lighting control Testing
Content Type	Text
Resource Type	Article

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