A search algorithm for quantum state engineering and metrology
نویسندگان
چکیده
In this paperwe present a search algorithm thatfinds useful optical quantum states which can be createdwith current technology.We apply the algorithm to the field of quantummetrologywith the goal offinding states that canmeasure a phase shift to a high precision. Our algorithm efficiently produces a number of novel solutions: wefind experimentally ready schemes to produce states that show significant improvements over the state-of-the-art, and canmeasurewith a precision that beats the shot noise limit by over a factor of 4. Furthermore, these states demonstrate a robustness to moderate/high photon losses, andwe present a conceptually simplemeasurement scheme that saturates the Cramér–Rao bound.
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