Hannover 2013 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 35: Poster I

Q 35.11: Poster

Tuesday, March 19, 2013, 16:00–18:30, Empore Lichthof

Effects of entanglement on the measurement of phase shifts — •Simon Laibacher and Matthias Freyberger — Institut für Quantenphysik, Universität Ulm, D-89069 Ulm, Germany

It has recently been shown that a two-mode squeezed vacuum has the capability to yield phase uncertainties at, or even slightly below, the Heisenberg limit, when applied in conjunction with a parity measurement [1]. We show that this can also be achieved using a different measurement scheme that is based on homodyne detection in an eight port interferometer. In particular, we look at the effect of entanglement on the phase uncertainty by comparing our results for a displaced two-mode squeezed vacuum with the case where two separable single-mode squeezed states are used.

[1] P. M. Anisimov et al., Phys. Rev. Lett. 104, 103602 (2010).