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Two mode squeezed states can be used to achieve Heisenberg limit scaling in interferometry: a phase shift of \δ \φ \≈ 2.76 / < N > can be resolved. The proposed scheme relies on balanced homodyne detection and can be implemented with current technology. The most important experimental imperfections are studied and their impact quantified.
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Steuernagel et al. (2004) studied this question.
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