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Title: Strategies for positive partial transpose (Ppt) states in quantum metrologies with noise
Authors: Majumder, Arunava
Shrotriya, Harshank
Kwek, Leong-Chuan 
Keywords: Entanglement
Quantum metrology
Issue Date: 28-May-2021
Publisher: MDPI AG
Citation: Majumder, Arunava, Shrotriya, Harshank, Kwek, Leong-Chuan (2021-05-28). Strategies for positive partial transpose (Ppt) states in quantum metrologies with noise. Entropy 23 (6) : 685. ScholarBank@NUS Repository.
Rights: Attribution 4.0 International
Abstract: Quantum metrology overcomes standard precision limits and has the potential to play a key role in quantum sensing. Quantum mechanics, through the Heisenberg uncertainty principle, imposes limits on the precision of measurements. Conventional bounds to the measurement precision such as the shot noise limit are not as fundamental as the Heisenberg limits, and can be beaten with quantum strategies that employ ‘quantum tricks’ such as squeezing and entanglement. Bipartite entangled quantum states with a positive partial transpose (PPT), i.e., PPT entangled states, are usually considered to be too weakly entangled for applications. Since no pure entanglement can be distilled from them, they are also called bound entangled states. We provide strategies, using which multipartite quantum states that have a positive partial transpose with respect to all bi-partitions of the particles can still outperform separable states in linear interferometers. © 2021 by the authors. Licensee MDPI, Basel, Switzerland.
Source Title: Entropy
ISSN: 1099-4300
DOI: 10.3390/e23060685
Rights: Attribution 4.0 International
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