Erlangen 2018 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 62: Poster: Quantum Optics and Photonics V

Q 62.49: Poster

Thursday, March 8, 2018, 16:15–18:15, Redoutensaal

Dynamics in quantum metrology — •Lukas J. Fiderer and Daniel Braun — Universität Tübingen, Germany

The typical protocol of a quantum measurement starts with state preparation followed by dynamics that encode the parameter to be measured to the system and ends with a readout by measuring the quantum state which allows to infer the parameter. System size N and the time t, that the system evolves before it is measured, are crucial resources that determine the performance of the measurement. Measurement precision scales under “classical” conditions with 1/(√NT), called standard quantum limit (SQL). It is well known that this limit can be beaten by preparing initial quantum states that are entangled, when SQL is replaced by the Heisenberg scaling 1/(NT). While a lot of research centres around finding beneficial entangled states to eventually beat SQL such quantum states are typically difficult to prepare and prone to decoherence. We present possibilities to improve quantum measurements under experimental feasible conditions with easily accessible, classical states. With the help of the quantum Fisher information we investigate novel types of dynamics to encode the parameter to the system. Realistic simulations prove the suitability for application in magnetic field sensors.