Parametric excitation and squeezing in a many-body spinor condensate

T. M. Hoang, M. Anquez, B. A. Robbins, X. Y. Yang, B. J. Land, C. D. Hamley and M. S. Chapman ()
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T. M. Hoang: School of Physics, Georgia Institute of Technology
M. Anquez: School of Physics, Georgia Institute of Technology
B. A. Robbins: School of Physics, Georgia Institute of Technology
X. Y. Yang: School of Physics, Georgia Institute of Technology
B. J. Land: School of Physics, Georgia Institute of Technology
C. D. Hamley: School of Physics, Georgia Institute of Technology
M. S. Chapman: School of Physics, Georgia Institute of Technology

Nature Communications, 2016, vol. 7, issue 1, 1-8

Abstract: Abstract Atomic spins are usually manipulated using radio frequency or microwave fields to excite Rabi oscillations between different spin states. These are single-particle quantum control techniques that perform ideally with individual particles or non-interacting ensembles. In many-body systems, inter-particle interactions are unavoidable; however, interactions can be used to realize new control schemes unique to interacting systems. Here we demonstrate a many-body control scheme to coherently excite and control the quantum spin states of an atomic Bose gas that realizes parametric excitation of many-body collective spin states by time varying the relative strength of the Zeeman and spin-dependent collisional interaction energies at multiples of the natural frequency of the system. Although parametric excitation of a classical system is ineffective from the ground state, we show that in our experiment, parametric excitation from the quantum ground state leads to the generation of quantum squeezed states.

Date: 2016
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DOI: 10.1038/ncomms11233

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