From order to chaos with a spin and a twist

P. S. Jessen, I. H. Deutsch, S. Ghose

Research output: Chapter in Book/Report/Conference proceedingConference contribution

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 (see [1] for a review). 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 [2]. We have further used our tools for control and state reconstruction to implement and verify protocols for optimal control of Cs hyperfine spins (Fig. 1), showing that an initial fiducial state can be transformed into any desired target state with a fidelity in the 80-90% range [3].

Original languageEnglish (US)
Title of host publicationLasers and Electro-Optics/Quantum Electronics and Laser Science Conference
Subtitle of host publication2010 Laser Science to Photonic Applications, CLEO/QELS 2010
StatePublished - Oct 11 2010
EventLasers and Electro-Optics/Quantum Electronics and Laser Science Conference: 2010 Laser Science to Photonic Applications, CLEO/QELS 2010 - San Jose, CA, United States
Duration: May 16 2010May 21 2010

Publication series

NameLasers and Electro-Optics/Quantum Electronics and Laser Science Conference: 2010 Laser Science to Photonic Applications, CLEO/QELS 2010

Other

OtherLasers and Electro-Optics/Quantum Electronics and Laser Science Conference: 2010 Laser Science to Photonic Applications, CLEO/QELS 2010
CountryUnited States
CitySan Jose, CA
Period5/16/105/21/10

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Radiation

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    Jessen, P. S., Deutsch, I. H., & Ghose, S. (2010). From order to chaos with a spin and a twist. In Lasers and Electro-Optics/Quantum Electronics and Laser Science Conference: 2010 Laser Science to Photonic Applications, CLEO/QELS 2010 [5501070] (Lasers and Electro-Optics/Quantum Electronics and Laser Science Conference: 2010 Laser Science to Photonic Applications, CLEO/QELS 2010).