Phys. Rev. A 66, 012313 (2002) [10 pages]Near-optimal two-mode spin squeezing via feedbackReceived 17 March 2002; published 25 July 2002 We propose a feedback scheme for the production of two-mode spin squeezing. We determine a general expression for the optimal feedback, which is also applicable to the case of single-mode spin squeezing. The two-mode spin squeezed states obtained via this feedback are optimal for j=1/2 and are very close to optimal for j>1/2. In addition, the master equation suggests a Hamiltonian that would produce two-mode spin squeezing without feedback, and is analogous to the two-axis countertwisting Hamiltonian in the single-mode case. © 2002 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevA.66.012313
DOI:
10.1103/PhysRevA.66.012313
PACS:
03.65.Ud, 42.50.Dv, 32.80.-t, 03.67.-a
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