Quantum limited estimation of multiple parameters

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• Animesh Datta (Warwick)
• Friday 08 April 2016, 13:30-15:00
• Physics East 217.

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We present a framework for the quantum-enhanced estimation of multiple parameters. We will address scenarios corresponding to both commuting and non-commuting unitary generators, as well as decoherence parameters such as loss and dephasing. We derive the quantum Fisher information matrix to put a lower bound on the total variance of all the parameters involved. We present the conditions for the attainment of the multi-parameter bound, which is not guaranteed unlike the quantum-limited estimation of single parameters. Our study also reveals that too much quantum entanglement may be detrimental to attaining the Heisenberg scaling in the estimation of unitarily generated parameters.

This talk is part of the Cold Atoms series.

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