1999/11/15 by Stefano Mancini, David Vitali, Paolo Tombesi · 1 citation
Computer Science · Mathematics · Physics and Astronomy · #Coherent states #Cold Atom Physics and Bose-Einstein Condensates #Computer science #Feedback loop #Limit (mathematics) #Mathematical analysis #Mathematics #Optics #Physics #Quadrature (astronomy) #Quantum #Quantum Information and Cryptography #Quantum Mechanics and Applications #Quantum limit #Quantum mechanics #Quantum state #Squeezed coherent state #State (computer science) #Stationary state #Statistical physics #quant-ph
paper · pdf · doi:10.1088/1464-4266/2/2/322
published as J. Opt. B: Quantum Semiclass. Opt. 2, 190 (2000) · 8 pages, 2 figures, to appear in the special Issue "Quantum Correlations and Fluctuations" of J. Opt. B
arxiv created 1999/11/15 · openalex publication_date 2000/04/01 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
We show that by using a feedback loop it is possible to reduce the fluctuations in one quadrature of the vibrational degree of freedom of a trapped ion below the quantum limit. The stationary state is not a proper squeezed state, but rather a squashed state, since the uncertainty in the orthogonal quadrature, which is larger than the standard quantum limit, is unaffected by the feedback action.