期刊
NEW JOURNAL OF PHYSICS
卷 18, 期 -, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/1367-2630/18/7/073033
关键词
quantum metrology; quantum state engineering; search algorithm; quantum optics
资金
- UK EPSRC through the Quantum Technology Hub: Networked Quantum Information Technology [EP/M013243/1]
- EPSRC [EP/M013243/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [EP/M013243/1] Funding Source: researchfish
In this paper we present a search algorithm that finds useful optical quantum states which can be created with current technology. We apply the algorithm to the field of quantum metrology with the goal of finding states that can measure a phase shift to a high precision. Our algorithm efficiently produces a number of novel solutions: we find experimentally ready schemes to produce states that show significant improvements over the state-of-the-art, and can measure with 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, and we present a conceptually simple measurement scheme that saturates the Cramer-Rao bound.
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